{"id":45514,"date":"2023-12-08T01:06:38","date_gmt":"2023-07-11T09:25:14","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45514-2\/"},"modified":"2024-05-04T12:36:34","modified_gmt":"2024-05-04T04:36:34","slug":"45514-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45514-2\/","title":{"rendered":""},"content":{"rendered":"

\u3053\u308c\u306fRust Guide (0.12.0 nightly) http:\/\/doc.rust-lang.org\/guide.html \u306e\u65e5\u672c\u8a9e\u8a33\u3067\u3059\u3002
\n\u3053\u306e\u30da\u30fc\u30b8\u306f\u524d\u534a\u00a701-\u00a714\u306e\u7ffb\u8a33\u3067\u3059\u3002\u5f8c\u534a\u00a715-\u00a727\u306fhttp:\/\/qiita.com\/lex_naturalis\/items\/dbef84b7788efbd30e21 \u3067\u3059\u3002<\/p>\n

\u307f\u306a\u3055\u3093\uff01\u3000Rust\u30ac\u30a4\u30c9\u3078\u3088\u3046\u3053\u305d\u3002Rust\u3067\u3069\u3046\u3084\u3063\u3066\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u3059\u308b\u304b\u3092\u304a\u77e5\u308a\u306b\u306a\u308a\u305f\u3051\u308c\u3070\u3001\u3053\u3053\u304c\u305d\u306e\u5834\u6240\u306b\u306a\u308a\u307e\u3059\u3002Rust\u306f\u300c\u7d20\u306e\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u4e0a\u3067\u306e\u9ad8\u6c34\u6e96\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u300d\u3001\u3064\u307e\u308a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u3044\u3046\u3082\u306e\u306b\u53ef\u80fd\u306a\u9650\u308a\u3067\u4f4e\u6c34\u6e96\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3092\u3001\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u30bc\u30ed\u30b3\u30b9\u30c8\u3067\u9ad8\u6c34\u6e96\u306e\u62bd\u8c61\u3068\u3068\u3082\u306b \u2015 \u3068\u3044\u3046\u306e\u3082\u4eba\u9593\u306f\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u3067\u306f\u306a\u3044\u308f\u3051\u3067\u3059\u304b\u3089 \u2015 \u63d0\u4f9b\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u306b\u30d5\u30a9\u30fc\u30ab\u30b9\u3057\u305f\u8a00\u8a9e\u3067\u3059\u3002\u79c1\u9054\u306fRust\u304c\u7279\u5225\u306a\u3082\u306e\u3060\u3068\u672c\u6c17\u3067\u8003\u3048\u3066\u3044\u307e\u3059\u3057\u3001\u307f\u306a\u3055\u3093\u306b\u3082\u305d\u3046\u601d\u3063\u3066\u3082\u3089\u3048\u308b\u3053\u3068\u3092\u671b\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n

Rust\u3068\u3069\u3046\u4ed8\u304d\u5408\u3063\u3066\u3044\u304f\u304b\u3092\u793a\u3059\u305f\u3081\u306b\u3001\u4f1d\u7d71\u7684\u306a\u300cHello, World!\u300d\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304f\u3053\u3068\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u306e\u6b21\u306b\u3001\u73fe\u5b9f\u4e16\u754c\u3067\u306eRust\u30d7\u30ed\u30b0\u30e9\u30e0\u3068Rust\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u66f8\u304f\u306e\u306b\u6709\u7528\u306a\u30c4\u30fc\u30eb\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u306b\u3001Rust\u306e\u57fa\u672c\u4e8b\u9805\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u3001\u305d\u308c\u3092\u8a66\u3057\u3066\u307f\u308b\u305f\u3081\u306b\u5c0f\u3055\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304d\u307e\u3059\u3002\u305d\u308c\u304b\u3089\u3001\u66f4\u306b\u9032\u3093\u3060\u4e8b\u9805\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u307e\u3059\u3002<\/p>\n

\u5b9c\u3057\u3044\u3067\u3059\u304b\uff1f\u3000\u3067\u306f\u306f\u3058\u3081\u307e\u3057\u3087\u3046\uff01<\/p>\n

1. Rust\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b<\/h1>\n

Rust\u3092\u4f7f\u3046\u305f\u3081\u306e\u6700\u521d\u306e\u30b9\u30c6\u30c3\u30d7\u306fRust\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3067\u3059\uff01 Rust\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u65b9\u6cd5\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u304c\u3001\u6700\u3082\u7c21\u5358\u306a\u306e\u306f\u3001rustup\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u4f7f\u3046\u3053\u3068\u3067\u3059\u3002Linux\u304bMac\u306a\u3089\u3070\u3001\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u306e\u306f\u3053\u308c\u3060\u3051\u3067\u3059\uff08$\u3092\u81ea\u5206\u3067\u30bf\u30a4\u30d7\u3059\u308b\u5fc5\u8981\u306f\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u308c\u3089\u306f\u5404\u30b3\u30de\u30f3\u30c9\u306e\u958b\u59cb\u5730\u70b9\u3092\u793a\u3057\u3066\u3044\u308b\u306b\u904e\u304e\u307e\u305b\u3093\uff09\uff1a<\/p>\n

$ <\/span>curl -s<\/span> https:\/\/static.rust-lang.org\/rustup.sh | sudo <\/span>sh\r\n<\/code><\/pre>\n
\uff08\u3082\u3057curl | sudo sh\u304c\u6c17\u306b\u306a\u308b\u3068\u3057\u3066\u3082\u7d9a\u304d\u3092\u8aad\u3093\u3067\u304f\u3060\u3055\u3044\u3002\u514d\u8cac\u4e8b\u9805\u306f\u4e0b\u306e\u65b9\u306b\u3042\u308a\u307e\u3059\u3002\uff09<\/p>\n
\u3082\u3057Windows\u306a\u3089\u3070\u300132-bit\u30a4\u30f3\u30b9\u30c8\u30fc\u30e9\u304b64-bit\u30a4\u30f3\u30b9\u30c8\u30fc\u30e9\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u3066\u3001\u305d\u308c\u3092\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u3042\u306a\u305f\u304c\u3082\u3057\u3082\u3046Rust\u306f\u3044\u3089\u306a\u3044\u3068\u6c7a\u5fc3\u3057\u305f\u306a\u3089\u3070\u3001\u79c1\u9054\u306b\u3068\u3063\u3066\u306f\u4e9b\u304b\u60b2\u3057\u3044\u3053\u3068\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u3067\u3082\u305d\u308c\u3067\u69cb\u3044\u307e\u305b\u3093\u3002\u3042\u3089\u3086\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u304c\u4e07\u4eba\u306b\u3068\u3063\u3066\u7d20\u6674\u3089\u3057\u3044\u3082\u306e\u3067\u3042\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\u3059\u304b\u3089\u3002\u30b9\u30af\u30ea\u30d7\u30c8\u306b\u3072\u3068\u3064\u5f15\u6570\u3092\u6e21\u3059\u3060\u3051\u3067\u69cb\u3044\u307e\u305b\u3093\uff1a<\/p>\n
$ <\/span>curl -s<\/span> https:\/\/static.rust-lang.org\/rustup.sh | sudo <\/span>sh -s<\/span> --<\/span> --uninstall<\/span>\r\n<\/code><\/pre>\n
\u3082\u3057Windows\u30a4\u30f3\u30b9\u30c8\u30fc\u30e9\u3092\u304a\u4f7f\u3044\u306a\u3089\u3001.exe\u3092\u3082\u3046\u4e00\u5ea6\u5b9f\u884c\u3059\u308c\u3070\u3001\u30a2\u30f3\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u306fRust\u3092\u66f4\u65b0\u3057\u305f\u3044\u3068\u304d\u306b\u3044\u3064\u3067\u3082\u518d\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u3057\u3066\u76ee\u4e0b\u306e\u3068\u3053\u308d\u3001\u66f4\u65b0\u306f\u3057\u3070\u3057\u3070\u884c\u308f\u308c\u307e\u3059\u3002Rust\u306f\u307e\u30601.0\u672a\u6e80\u306e\u6bb5\u968e\u3067\u3059\u304b\u3089\u3001\uff08*Rust\u3092\u958b\u767a\u3057\u3066\u3044\u308b\uff09\u4eba\u3005\u306f\u3042\u306a\u305f\u304c\u3054\u304f\u6700\u8fd1\u306eRust\u3092\u4f7f\u3063\u3066\u3044\u308b\u3082\u306e\u3068\u60f3\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u3053\u3067\u3001\u3082\u3046\u4e00\u3064\u5225\u306e\u70b9\u306b\u3064\u3044\u3066\u304a\u8a71\u3059\u308b\u756a\u3067\u3059\u3002\u79c1\u9054\u304c\u7686\u3055\u3093\u306bcurl | sudo sh\u3068\u3059\u308b\u3088\u3046\u306b\u3044\u3063\u305f\u3053\u3068\u306b\u3001\u305d\u308c\u306b\u306f\u3082\u3063\u3068\u3082\u306a\u3068\u3053\u308d\u304c\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u6c17\u5206\u3092\u5bb3\u3059\u308b\u4eba\u3082\u3044\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002\u5b9f\u969b\u3001\u305d\u3046\u306a\u3063\u3066\u5f53\u7136\u3067\u3059\uff01 \u57fa\u672c\u7684\u306b\u306f\u3001\u3053\u308c\u3092\u5b9f\u884c\u3059\u308b\u969b\u306b\u3042\u306a\u305f\u306fRust\u3092\u4fdd\u5b88\u3057\u3066\u3044\u308b\u5584\u610f\u306e\u4eba\u3005\u304c\u3042\u306a\u305f\u306e\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3092\u30cf\u30c3\u30af\u3057\u3066\u60aa\u3044\u3053\u3068\u3092\u884c\u3063\u305f\u308a\u3057\u306a\u3044\u3001\u3068\u3044\u3046\u3053\u3068\u3092\u4fe1\u983c\u3057\u3066\u3044\u308b\u3053\u3068\u306b\u306a\u308b\u304b\u3089\u3067\u3059\u3002\u305d\u308c\u306f\u7acb\u6d3e\u306a\u672c\u80fd\u3067\u3059\uff01 \u3082\u3057\u3042\u306a\u305f\u304c\u305d\u3046\u3044\u3046\u4eba\u3005\u306e\u4e00\u54e1\u3060\u3068\u3057\u305f\u3089\u3001Rust\u306e\u30bd\u30fc\u30b9\u304b\u3089\u306e\u30d3\u30eb\u30c9\u306b\u3064\u3044\u3066\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u304b\u3001\u516c\u5f0f\u306e\u30d0\u30a4\u30ca\u30ea\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u3001\u79c1\u9054\u306f\u3053\u306e\u65b9\u6cd5\u304c\u3044\u3064\u307e\u3067\u3082Rust\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u5b9a\u756a\u306e\u65b9\u6cd5\u3067\u3042\u308a\u7d9a\u3051\u308b\u3068\u3044\u3046\u3053\u3068\u306f\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3001\u3068\u7d04\u675f\u3057\u307e\u3059\u3002\u3053\u306e\u65b9\u6cd5\u306f\u3001Rust\u304c\u30a2\u30eb\u30d5\u30a1\u6bb5\u968e\u306b\u3042\u308b\u9593\u3001\u307f\u306a\u3055\u3093\u306b\u6700\u65b0\u306e\u72b6\u614b\u3092\u4fdd\u3063\u3066\u3082\u3089\u3046\u305f\u3081\u306e\u6700\u3082\u5bb9\u6613\u306a\u65b9\u6cd5\u3067\u3042\u308b\u3068\u3044\u3046\u3060\u3051\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n
\u3042\u3001\u516c\u5f0f\u306b\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u305f\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306b\u3082\u89e6\u308c\u3066\u7f6e\u304b\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u306d\u3002<\/p>\n
Windows (7, 8, Server 2008 R2), x86 \u306e\u307f
\nLinux (2.6.18 \u4ee5\u964d, \u69d8\u3005\u306a\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3), x86 \u53ca\u3073 x86-64
\nOSX 10.7 (Lion) \u4ee5\u964d, x86 \u53ca\u3073 x86-64<\/p>\n
Rust\u306f\u3053\u308c\u3089\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306b\u52a0\u3048\u3066\u3001\u307e\u305f\u5e7e\u3064\u304bAndroid\u306e\u3088\u3046\u306a\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u3082\u5e83\u7bc4\u306b\u30c6\u30b9\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u6b86\u3069\u306e\u30c6\u30b9\u30c8\u306f\u3053\u308c\u3089\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u304b\u3089\u3001\u3053\u308c\u3089\u304cRust\u304c\u52d5\u4f5c\u3059\u308b\u53ef\u80fd\u6027\u306e\u6700\u3082\u9ad8\u3044\u3082\u306e\u3067\u3059\u3002<\/p>\n
\u6700\u5f8c\u306b\u3001Windows\u306b\u3064\u3044\u3066\u30b3\u30e1\u30f3\u30c8\u3057\u3066\u304a\u304d\u307e\u3059\u3002Rust\u306fWindows\u3092\u30ea\u30ea\u30fc\u30b9\u306e\u969b\u306e\u4e00\u7d1a\u5e02\u6c11\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u3042\u308b\u3068\u8003\u3048\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u6b63\u76f4\u306a\u3053\u3068\u3092\u8a00\u3048\u3070\u3001Windows\u4e0a\u3067\u306e\u7d4c\u9a13\u306fLinux\/ OS X\u4e0a\u3067\u306e\u7d4c\u9a13\u307b\u3069\u5747\u6574\u306e\u3068\u308c\u305f\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u308c\u306b\u3064\u3044\u3066\u306f\u307e\u3060\u4f5c\u696d\u4e2d\u3067\u3059\uff01 \u3082\u3057\u4f55\u304b\u304c\u52d5\u4f5c\u3057\u306a\u3044\u3068\u3057\u305f\u3089\u3001\u305d\u308c\u306f\u30d0\u30b0\u3067\u3059\u3002\u305d\u3046\u3044\u3046\u3053\u3068\u304c\u751f\u3058\u305f\u3089\u3001\u3069\u3046\u305e\u6211\u3005\u306b\u77e5\u3089\u305b\u3066\u304f\u3060\u3055\u3044\u3002\u6211\u3005\u306f\u3069\u306e\u30b3\u30df\u30c3\u30c8\u3082\u3001\u4ed6\u306e\u3069\u3093\u306a\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306b\u5bfe\u3059\u308b\u306e\u3068\u540c\u3058\u3088\u3046\u306b\u3001Windows\u306b\u5bfe\u3057\u3066\u30c6\u30b9\u30c8\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3082\u3057Rust\u3092\u65e2\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u306a\u3089\u3070\u3001\u30b7\u30a7\u30eb\u3092\u7acb\u3061\u4e0a\u3052\u3066\u6b21\u306e\u3088\u3046\u306b\u30bf\u30a4\u30d7\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
$ <\/span>rustc --version<\/span>\r\n<\/code><\/pre>\n
\u4ee5\u4e0b\u306e\u69d8\u306a\u611f\u3058\u306e\u51fa\u529b\u7d50\u679c\u3092\u76ee\u306b\u3059\u308b\u306f\u305a\u3067\u3059\uff1a<\/p>\n
rustc 0.12.0-pre (443a1cd 2014-06-08 14:56:52 -0700)\r\n<\/code><\/pre>\n
\u3053\u3046\u306a\u3063\u305f\u306e\u306a\u3089\u3001Rust\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u306f\u6210\u529f\u3067\u3059\uff01 \u304a\u3081\u3067\u3068\u3046\uff01<\/p>\n
\u3082\u3057\u305d\u3046\u3067\u306a\u3044\u3068\u3057\u3066\u3082\u3001\u52a9\u3051\u3066\u3082\u3089\u3048\u308b\u5834\u6240\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u3002\u3044\u3061\u3070\u3093\u7c21\u5358\u306a\u306e\u306f\u3001irc.mozilla.org\u306eIRC\u30c1\u30e3\u30f3\u30cd\u30eb#rust\u3067\u3059\u3002Mibbit\u7d4c\u7531\u3067\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002\u30ea\u30f3\u30af\u3092\u30af\u30ea\u30c3\u30af\u3059\u308c\u3070\u3001\u4ed6\u306e\u300c\u30e9\u30b9\u30bf\u30b7\u30a2\u30f3 Rustaceans\u300d\uff08\u3053\u308c\u306f\u6211\u3005\u304c\u81ea\u79f0\u3057\u3066\u3044\u308b\u30d0\u30ab\u3052\u305f\u30a2\u30c0\u540d\u3067\u3059\uff09\u3068\u30c1\u30e3\u30c3\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u6211\u3005\u304c\u7686\u3055\u3093\u3092\u52a9\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u3002\u4ed6\u306e\u91cd\u8981\u306a\u30ea\u30bd\u30fc\u30b9\u3068\u3057\u3066\u306f\u3001\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\u3084\/r\/rust\/subreddit\u3084Stack Overflow\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
2. Hello, World!<\/h1>\n
\u3055\u3066Rust\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u308f\u3051\u3067\u3059\u304b\u3089\u3001\u6700\u521d\u306eRust\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u3069\u3093\u306a\u65b0\u3057\u3044\u8a00\u8a9e\u3067\u3042\u308c\u3001\u6700\u521d\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f”Hello, world!”\u3068\u3044\u3046\u30c6\u30af\u30b9\u30c8\u3092\u753b\u9762\u306b\u8868\u793a\u3059\u308b\u3082\u306e\u306b\u3059\u308b\u306e\u304c\u4f1d\u7d71\u3067\u3059\u3002\u3053\u3046\u3057\u305f\u5358\u7d14\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u304b\u3089\u59cb\u3081\u308b\u3053\u3068\u306e\u826f\u3044\u70b9\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u304d\u3061\u3093\u3068\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3044\u308b\u304b\u3060\u3051\u3067\u306a\u304f\u3001\u305d\u308c\u304c\u304d\u3061\u3093\u3068\u52d5\u4f5c\u3057\u3066\u3044\u308b\u304b\u3092\u691c\u8a3c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u305d\u308c\u306b\u3001\u753b\u9762\u306b\u60c5\u5831\u3092\u8868\u793a\u3059\u308b\u3068\u3044\u3046\u3068\u3044\u3046\u306e\u306f\u3054\u304f\u3042\u308a\u3075\u308c\u305f\u4ed5\u4e8b\u3067\u3082\u3042\u308a\u307e\u3059\u304b\u3089\u3002<\/p>\n
\u6700\u521d\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u306f\u3001\u30b3\u30fc\u30c9\u3092\u66f8\u304d\u8fbc\u3080\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u79c1\u81ea\u8eab\u306f\u81ea\u5206\u306e\u30db\u30fc\u30e0\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u7528\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u4f5c\u3063\u3066\u3001\u81ea\u5206\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u5168\u90e8\u305d\u3053\u306b\u53ce\u3081\u3066\u304a\u304f\u306e\u304c\u597d\u304d\u3067\u3059\u3002\u3067\u3059\u304c\u3001Rust\u306f\u3042\u306a\u305f\u306e\u30b3\u30fc\u30c9\u304c\u3069\u3053\u306b\u7f6e\u304b\u308c\u3066\u3044\u3088\u3046\u304c\u6c17\u306b\u306f\u3057\u307e\u305b\u3093\u3002<\/p>\n
\u3053\u3053\u307e\u3067\u6765\u305f\u3068\u3053\u308d\u3067\u3001\u3082\u3046\u3072\u3068\u3064\u89e6\u308c\u3066\u304a\u304f\u3079\u304d\u61f8\u5ff5\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30ac\u30a4\u30c9\u306f\u3001\u307f\u306a\u3055\u3093\u304c\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u306e\u57fa\u672c\u7684\u306a\u64cd\u4f5c\u306b\u89aa\u3057\u3093\u3067\u3044\u308b\u3053\u3068\u3092\u60f3\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002Rust\u306f\u307f\u306a\u3055\u3093\u304c\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u306b\u3064\u3044\u3066\u81a8\u5927\u306a\u77e5\u8b58\u306e\u7dcf\u3066\u3092\u77e5\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u8981\u6c42\u306f\u3057\u3066\u3044\u307e\u305b\u3093\u304c\u3001Rust\u8a00\u8a9e\u304c\u3088\u308a\u3044\u3063\u305d\u3046\u5b8c\u6210\u3055\u308c\u305f\u72b6\u614b\u306b\u5230\u308b\u307e\u3067\u306f\u3001\u7d71\u5408\u958b\u767a\u74b0\u5883(IDE)\u30b5\u30dd\u30fc\u30c8\u306f\u3042\u3061\u3053\u3061\u7c97\u306e\u3042\u308b\u3082\u306e\u306b\u3068\u3069\u307e\u308b\u3067\u3057\u3087\u3046\u3002\u306a\u304a\u3001Rust\u306f\u30c6\u30ad\u30b9\u30c8\u7de8\u96c6\u30c4\u30fc\u30eb\u306b\u3064\u3044\u3066\u3082\u3001\u30b3\u30fc\u30c9\u304c\u3069\u3053\u306b\u7f6e\u304b\u308c\u308b\u304b\u306b\u3064\u3044\u3066\u3082\u3001\u306a\u3093\u3089\u7279\u5225\u306a\u8981\u6c42\u306f\u3057\u307e\u305b\u3093\u3002<\/p>\n
\u305d\u308c\u306f\u305d\u3046\u3044\u3046\u3053\u3068\u3068\u3057\u3066\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u7528\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u4e2d\u306b\u3042\u308b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u4f5c\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n
$<\/span> mkdir<\/span> ~\/projects\r\n$<\/span> cd<\/span> ~\/projects\r\n$<\/span> mkdir <\/span>hello_world\r\n$<\/span> cd <\/span>hello_world\r\n<\/code><\/pre>\n
\u3082\u3057Windows\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u3001PowerShell\u3092\u5229\u7528\u3057\u3066\u3044\u306a\u3044\u306a\u3089\u3001~\u306f\u4f7f\u3048\u306a\u3044\u3067\u3057\u3087\u3046\u3002\u3055\u3089\u306a\u308b\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3054\u5229\u7528\u306e\u30b7\u30a7\u30eb\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u6b21\u306b\u65b0\u3057\u3044\u30bd\u30fc\u30b9\u30fb\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u308a\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u4ee5\u964d\u306e\u4f8b\u3067\u306f\u3001syntax editor\u3068\u3044\u3046\u8868\u8a18\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u7de8\u96c6\u3059\u308b\u3053\u3068\u3092\u8868\u3059\u3053\u3068\u306b\u3057\u307e\u3059\u304c\u3001\u5225\u306b\u304a\u597d\u304d\u306a\u3069\u3093\u306a\u65b9\u6cd5\u3092\u7528\u3044\u3066\u69cb\u3044\u307e\u305b\u3093\u3002\u3055\u3066\u3001\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u3092main.rs\u3068\u3044\u3046\u3053\u3068\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
$ <\/span>editor main.rs\r\n<\/code><\/pre>\n
Rust\u30d5\u30a1\u30a4\u30eb\u306f\u5e38\u306b.rs\u3068\u3044\u3046\u62e1\u5f35\u5b50\u3067\u7d42\u308f\u308a\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u540d\u306b\u8907\u6570\u306e\u5358\u8a9e\u3092\u4f7f\u3046\u3068\u304d\u306b\u306f\u30a2\u30f3\u30c0\u30fc\u30b9\u30b3\u30a2\u3092\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\u3002\u3064\u307e\u308a\u3001helloworld.rs\u3067\u306f\u306a\u304fhello_world.rs\u3068\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u3055\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3044\u305f\u308f\u3051\u3067\u3059\u304c\u3001\u6b21\u306b\u3053\u3046\u30bf\u30a4\u30d7\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Hello, world!\"<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30d5\u30a1\u30a4\u30eb\u3092\u4fdd\u5b58\u3057\u3066\u3001\u30bf\u30fc\u30df\u30ca\u30eb\u30fb\u30a6\u30a3\u30f3\u30c9\u30a6\u306b\u6b21\u306e\u3088\u3046\u306b\u30bf\u30a4\u30d7\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
$<\/span> rustc main.rs\r\n$<\/span> .\/main # or main.exe on Windows<\/span>\r\nHello, world!\r\n<\/span><\/code><\/pre>\n
\u6210\u529f\u3067\u3059\uff01 \u4f55\u304c\u8d77\u304d\u305f\u306e\u304b\u3001\u8a73\u3057\u304f\u898b\u3066\u884c\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3089\u306e\u884c\u306fRust\u306e \u51fd\u6570 \u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002main\u51fd\u6570\u306f\u7279\u5225\u306a\u51fd\u6570\u3067\u3059\u3002\u3053\u306e\u51fd\u6570\u306f\u3042\u3089\u3086\u308bRust\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u958b\u59cb\u5730\u70b9\u306b\u306a\u308a\u307e\u3059\u30021\u884c\u76ee\u304c\u8a00\u3063\u3066\u3044\u308b\u306e\u306f\u3053\u3046\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u300c\u79c1\u306fmain\u3068\u3044\u3046\u540d\u524d\u306e\u51fd\u6570\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u51fd\u6570\u306f\u5f15\u6570\u3092\u53d6\u3089\u305a\u3001\u307e\u305f\u8fd4\u5024\u3092\u8fd4\u3057\u307e\u305b\u3093\u3002\u300d\u3082\u3057\u5f15\u6570\u304c\u3042\u3063\u305f\u3068\u3059\u308c\u3070\u3001\u305d\u308c\u3089\u306e\u5f15\u6570\u306f\u62ec\u5f27\u3001\u3064\u307e\u308a(\u3068)\u306e\u4e2d\u306b\u66f8\u304b\u308c\u308b\u3053\u3068\u306b\u306a\u3063\u305f\u3067\u3057\u3087\u3046\u3002\u307e\u305f\u3001\u3053\u306e\u51fd\u6570\u304b\u3089\u306f\u4f55\u306e\u5024\u3082\u8fd4\u3055\u306a\u3044\u306e\u3067\u3001\u8fd4\u5024\u306e\u8868\u8a18\u306f\u7701\u7565\u3057\u307e\u3057\u305f\u3002\u305d\u308c\u306b\u3064\u3044\u3066\u306f\u307e\u305f\u5f8c\u306b\u89e6\u308c\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u51fd\u6570\u304c\u6ce2\u62ec\u5f27\u306b\u56f2\u307e\u308c\u3066\u3044\u308b\u3053\u3068\u306b\u3082\u6c17\u304c\u3064\u304f\u3067\u3057\u3087\u3046\u3002Rust\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u62ec\u5f27\u304c\u3069\u3093\u306a\u51fd\u6570\u306e\u672c\u4f53\u306b\u3082\u8981\u6c42\u3055\u308c\u307e\u3059\u3002\u307e\u305f\u3001\u95a2\u6570\u5b9a\u7fa9\u3068\u540c\u3058\u884c\u306b\u30b9\u30da\u30fc\u30b9\u3092\u3072\u3068\u3064\u3060\u3051\u7a7a\u3051\u3066\u3001\u958b\u304d\u62ec\u5f27\u3092\u7f6e\u304f\u306e\u304c\u826f\u3044\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30b9\u30bf\u30a4\u30eb\u3060\u3068\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n
\u6b21\u306b\u6765\u308b\u306e\u306f\u3053\u306e\u884c\u3067\u3059\uff1a<\/p>\n
    println!<\/span>(<\/span>\"Hello, world!\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u884c\u304c\u3001\u6211\u3005\u306e\u5c0f\u3055\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4ed5\u4e8b\u306e\u5168\u3066\u3092\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u884c\u306b\u306f\u91cd\u8981\u306a\u8a73\u7d30\u304c\u591a\u6570\u8a70\u307e\u3063\u3066\u3044\u307e\u3059\u3002\u307e\u305a\u7b2c\u4e00\u306f\u3001\u3053\u306e\u884c\u306f\u3001\u30bf\u30d6\u3067\u306f\u306a\u304f\u30014\u3064\u306e\u30b9\u30da\u30fc\u30b9\u3067\u30a4\u30f3\u30c7\u30f3\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3042\u306a\u305f\u304c\u9078\u3093\u3060\u30a8\u30c7\u30a3\u30bf\u3092\u8a2d\u5b9a\u3057\u3066\u3001\u30bf\u30d6\u30ad\u30fc\u304c\u30bf\u30d6\u3067\u306f\u306a\u304f4\u3064\u306e\u30b9\u30da\u30fc\u30b9\u3092\u633f\u5165\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u79c1\u9054\u306f\u69d8\u3005\u306a\u30a8\u30c7\u30a3\u30bf\u7528\u306e\u8a2d\u5b9a\u30b5\u30f3\u30d7\u30eb\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u7b2c\u4e8c\u306e\u70b9\u306f\u3001println!()\u3068\u3044\u3046\u90e8\u5206\u3067\u3059\u3002\u3053\u308c\u306fRust \u30de\u30af\u30ed \u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002Rust\u30de\u30af\u30ed\u3068\u3044\u3046\u306e\u306fRust\u3067\u30e1\u30bf\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u884c\u3046\u65b9\u6cd5\u3067\u3059\u3002\u3082\u3057\u3053\u308c\u304c\u4ee3\u308f\u308a\u306b\u51fd\u6570\u3060\u3063\u305f\u3068\u3057\u305f\u3089\u3001println()\u3068\u3044\u3046\u3088\u3046\u306a\u898b\u305f\u76ee\u306b\u306a\u3063\u305f\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u76ee\u4e0b\u306e\u76ee\u7684\u306e\u305f\u3081\u306b\u306f\u3001\u3053\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u6c17\u306b\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305f\u3060\u3001\u6642\u306b!\u3092\u76ee\u306b\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u3001\u305d\u308c\u304c\u666e\u901a\u306e\u51fd\u6570\u3067\u306f\u306a\u304f\u30de\u30af\u30ed\u306e\u547c\u3073\u51fa\u3057\u3067\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u610f\u5473\u3057\u3066\u3044\u308b\u306e\u3060\u3068\u3060\u3051\u77e5\u3063\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u6700\u5f8c\u306b\u3082\u3046\u3072\u3068\u3064\u3002\u3082\u3057\u3042\u306a\u305f\u304cC\u306e\u30de\u30af\u30ed\u3092\u4f7f\u3063\u305f\u3053\u3068\u304c\u3042\u308b\u3068\u3057\u305f\u3089\u3001Rust\u306e\u30de\u30af\u30ed\u306f\u305d\u308c\u3068\u306f\u5927\u304d\u304f\u9055\u3046\u3082\u306e\u3067\u3059\u3002\u30de\u30af\u30ed\u3092\u4f7f\u3046\u3053\u3068\u3092\u6050\u308c\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u6700\u5f8c\u306b\u306f\u305d\u306e\u8a73\u7d30\u306b\u89e6\u308c\u307e\u3059\u304c\u3001\u4eca\u306e\u3068\u3053\u308d\u306f\u79c1\u9054\u306e\u3044\u3046\u3053\u3068\u3092\u4fe1\u3058\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u6b21\u306b\u3001”Hello, world!”\u306f \u6587\u5b57\u5217 string \u3067\u3059\u3002\u6587\u5b57\u5217\u3068\u3044\u3046\u3082\u306e\u306f\u30b7\u30b9\u30c6\u30e0\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306b\u65bc\u3051\u308b\u9a5a\u304f\u307b\u3069\u8fbc\u307f\u5165\u3063\u305f\u30c8\u30d4\u30c3\u30af\u3067\u3059\u304c\u3001\u3053\u308c\u306f \u9759\u7684\u306b\u5272\u308a\u5f53\u3066\u3055\u308c\u305f \u6587\u5b57\u5217\u3067\u3059\u3002\u5272\u308a\u5f53\u3066\u306e\u69d8\u3005\u306a\u7a2e\u985e\u306b\u3064\u3044\u3066\u306f\u5f8c\u306b\u3082\u3063\u3068\u304a\u8a71\u3057\u307e\u3059\u3002\u3053\u306e\u6587\u5b57\u5217\u3092\u5f15\u6570\u3068\u3057\u3066println!\u306b\u5f15\u304d\u6e21\u3057\u3001\u305d\u308c\u304c\u753b\u9762\u306b\u3053\u306e\u6587\u5b57\u5217\u3092\u8868\u793a\u3059\u308b\u306e\u3067\u3059\u3002\u7c21\u5358\u3067\u3059\u306d\uff01<\/p>\n
\u6700\u5f8c\u306b\u3001\u3053\u306e\u884c\u306f\u30bb\u30df\u30b3\u30ed\u30f3(;)\u3067\u7d42\u308f\u3063\u3066\u3044\u307e\u3059\u3002Rust\u306f \u5f0f\u6307\u5411 \u306e\u8a00\u8a9e\u3067\u3059\u3002\u3053\u308c\u306f\u3064\u307e\u308a\u3001\u6b86\u3069\u306e\u3082\u306e\u304c\u5f0f\u3060\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u3053\u306e;\u306f\u3001\u3053\u306e\u5f0f\u304c\u305d\u3053\u3067\u7d42\u4e86\u3057\u3066\u304a\u308a\u3001\u65b0\u3057\u3044\u5f0f\u304c\u59cb\u307e\u308b\u3068\u3053\u308d\u3067\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u793a\u3059\u305f\u3081\u306b\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002Rust\u306e\u30b3\u30fc\u30c9\u306f\u6b86\u3069\u306e\u884c\u304c;\u3067\u7d42\u308f\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3064\u3044\u3066\u7acb\u3061\u5165\u3063\u3066\u306f\u3053\u306e\u30ac\u30a4\u30c9\u306e\u5f8c\u306e\u307b\u3046\u3067\u6271\u3044\u307e\u3059\u3002<\/p>\n
\u6700\u5f8c\u306b\u3001\u5b9f\u969b\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092 \u30b3\u30f3\u30d1\u30a4\u30eb \u3057\u3066 \u5b9f\u884c \u3057\u307e\u3057\u3087\u3046\u3002\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u306e\u540d\u524d\u3092\u6e21\u305b\u3070\u3001\u30b3\u30f3\u30d1\u30a4\u30e9 rustc\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
$<\/span> rustc main.rs\r\n<\/code><\/pre>\n
\u3082\u3057C\u304bC++\u306e\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u304c\u3042\u308c\u3070\u3001\u3053\u308c\u306fgcc\u3068\u304bclang\u3068\u4f3c\u305f\u3088\u3046\u306a\u3082\u306e\u306b\u898b\u3048\u308b\u3067\u3057\u3087\u3046\u3002Rust\u306f\u5b9f\u884c\u53ef\u80fd\u306a\u30d0\u30a4\u30ca\u30ea\u30d5\u30a1\u30a4\u30eb\u3092\u51fa\u529b\u3057\u307e\u3059\u3002\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u3092ls\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> ls<\/span>\r\nmain  main.rs\r\n<\/span><\/code><\/pre>\n
\u6216\u3044\u306fWindows\u3067\u3042\u308c\u3070\uff1a<\/p>\n
$<\/span> dir<\/span>\r\nmain.exe  main.rs\r\n<\/span><\/code><\/pre>\n
\u3044\u307e\u30842\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002.rs\u62e1\u5f35\u5b50\u304c\u3064\u3044\u305f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3068\u3001\u5b9f\u884c\u53ef\u80fd\u30d5\u30a1\u30a4\u30eb\uff08Windows\u3067\u306fmain.exe\u3067\u4ed6\u3067\u306fmain\uff09\u3067\u3059\u3002<\/p>\n
$<\/span> .\/main  # or main.exe on Windows<\/span>\r\n<\/code><\/pre>\n
\u4e0a\u306e\u3088\u3046\u306b\u3059\u308b\u3068\u3001\u30bf\u30fc\u30df\u30ca\u30eb\u306bHello, world!\u3068\u3044\u3046\u30c6\u30af\u30b9\u30c8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u3082\u3057\u3042\u306a\u305f\u304cRuby, Python, JavaScript\u306e\u3088\u3046\u306a\u52d5\u7684\u306b\u578b\u4ed8\u3051\u3055\u308c\u305f\u8a00\u8a9e\u304b\u3089\u3084\u3063\u3066\u304d\u305f\u306e\u3067\u3042\u308c\u3070\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u3068\u5b9f\u884c\u3068\u3044\u30462\u3064\u306e\u30b9\u30c6\u30c3\u30d7\u304c\u5206\u96e2\u3057\u3066\u3044\u308b\u306e\u306b\u6163\u308c\u3066\u3044\u306a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002Rust\u306f\u5b9f\u884c\u6642\u524d\u306b\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u308b\u8a00\u8a9e\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u305d\u308c\u3092\u8ab0\u304b\u306b\u3042\u3052\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u304c\u3001\u305d\u306e\u3068\u304d\u306b\u3082\u3089\u3063\u305f\u76f8\u624b\u306fRust\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u3082\u3057\u3042\u306a\u305f\u304c.rb\u3068\u304b.py\u3060\u3068\u304b.js\u3060\u3068\u304b\u3044\u3063\u305f\u30d5\u30a1\u30a4\u30eb\u3092\u3042\u3052\u308b\u3068\u3059\u308b\u3068\u3001\u76f8\u624b\u306fRuby\/Python\/JavaScript\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3057\u304b\u3057\u3001\u3042\u306a\u305f\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u5b9f\u884c\u3059\u308b\u306e\u306b\u3072\u3068\u3064\u306e\u30b3\u30de\u30f3\u30c9\u3057\u304b\u3044\u3089\u306a\u3044\u3067\u6e08\u307f\u307e\u3059\u3002\u8a00\u8a9e\u3092\u30c7\u30b6\u30a4\u30f3\u3059\u308b\u306b\u969b\u3057\u3066\u306f\u3001\u3042\u3089\u3086\u308b\u3082\u306e\u304c\u30c8\u30ec\u30fc\u30c9\u30fb\u30aa\u30d5\u306e\u95a2\u4fc2\u306b\u306a\u308a\u307e\u3059\u3002Rust\u306fRust\u306a\u308a\u306e\u9078\u629e\u3092\u3057\u305f\u306e\u3067\u3059\u3002<\/p>\n
\u304a\u3081\u3067\u3068\u3046\u3054\u3056\u3044\u307e\u3059\uff01\u3000\u307f\u306a\u3055\u3093\u306f\u3082\u3046\u516c\u5f0f\u306bRust\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3044\u3066\u3057\u307e\u3063\u305f\u308f\u3051\u3067\u3059\u304b\u3089\u3001Rust\u30d7\u30ed\u30b0\u30e9\u30de\u3067\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u3088\u3046\u3053\u305d\u3088\u3046\u3053\u305d\u3002<\/p>\n
\u6b21\u306b\u3001\u307f\u306a\u3055\u3093\u3092\u3001\u73fe\u5b9f\u4e16\u754c\u3067\u306eRust\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304f\u306e\u306b\u7528\u3044\u3089\u308c\u308b\u3082\u3046\u3072\u3068\u3064\u5225\u306eCargo\u3068\u3044\u3046\u30c4\u30fc\u30eb\u306b\u3054\u7d39\u4ecb\u3057\u307e\u3057\u3087\u3046\u3002\u5358\u306brustc\u3060\u3051\u3092\u3064\u304b\u3046\u3068\u3044\u3046\u306e\u306f\u3001\u5358\u7d14\u306a\u3053\u3068\u3092\u3059\u308b\u306b\u306f\u7d50\u69cb\u306a\u3082\u306e\u3067\u3059\u304c\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u304c\u6210\u9577\u3059\u308b\u306b\u9023\u308c\u3066\u3001\u3042\u306a\u305f\u304c\u305d\u306e\u5168\u3066\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u7ba1\u7406\u3059\u308b\u624b\u52a9\u3051\u3092\u3057\u3066\u304f\u308c\u305f\u308a\u3001\u3042\u306a\u305f\u306e\u30b3\u30fc\u30c9\u3092\u4ed6\u306e\u4eba\u3005\u3084\u4ed6\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3068\u30b7\u30a7\u30a2\u3059\u308b\u306e\u3092\u7c21\u5358\u306b\u3057\u3066\u304f\u308c\u305f\u308a\u3059\u308b\u3082\u306e\u304c\u6b32\u3057\u304f\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n
3. Hello, Cargo!<\/h1>\n
Cargo\u306fRust\u4fe1\u5949\u8005\u304c\u81ea\u5206\u306eRust\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u7ba1\u7406\u3059\u308b\u52a9\u3051\u3068\u3057\u3066\u4f7f\u3046\u30c4\u30fc\u30eb\u3067\u3059\u3002Cargo\u306f\u73fe\u5728\u306e\u3068\u3053\u308d\u3001\u3061\u3087\u3046\u3069Rust\u304c\u305d\u3046\u3067\u3042\u308b\u3088\u3046\u306b\u3001\u30a2\u30eb\u30d5\u30a1\u6bb5\u968e\u3067\u3042\u308a\u3001\u306a\u304a\u3082\u3063\u3066\u4f5c\u696d\u304c\u9032\u884c\u4e2d\u3067\u3059\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u591a\u304f\u306eRust\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u3068\u3063\u3066\u65e2\u306b\u5145\u5206\u4f7f\u3046\u306e\u306b\u9069\u3057\u305f\u3082\u306e\u3067\u3042\u308a\u3001Rust\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306f\u6700\u521d\u304b\u3089\u3053\u306e\u30c4\u30fc\u30eb\u3092\u4f7f\u3046\u3082\u306e\u3068\u60f3\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
Cargo\u304c\u7ba1\u7406\u3059\u308b\u306e\u306f3\u3064\u306e\u3082\u306e\u3067\u3059\u3002\u3042\u306a\u305f\u306e\u30b3\u30fc\u30c9\u306e\u30d3\u30eb\u30c9\u3001\u305d\u306e\u30b3\u30fc\u30c9\u304c\u5fc5\u8981\u3068\u3059\u308b\u4f9d\u5b58\u95a2\u4fc2\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3001\u305d\u308c\u3089\u306e\u30d3\u30eb\u30c9\u3001\u3067\u3059\u3002\u6700\u521d\u306e\u3046\u3061\u306f\u3001\u3042\u306a\u305f\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u307e\u3063\u305f\u304f\u4f9d\u5b58\u95a2\u4fc2\u3092\u6301\u3063\u3066\u3044\u307e\u305b\u3093\u3002\u3067\u3059\u304b\u3089\u3001Cargo\u306e\u6a5f\u80fd\u306e\u5185\u3067\u6700\u521d\u306e\u3082\u306e\u3060\u3051\u3092\u4f7f\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u6700\u7d42\u7684\u306b\u306f\u3001\u3082\u3063\u3068\u591a\u304f\u306e\u3082\u306e\u304c\u4ed8\u3051\u52a0\u308f\u308a\u307e\u3059\u3002Cargo\u3092\u4f7f\u3063\u3066\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u59cb\u3081\u308c\u3070\u3001\u5f8c\u3067\u4ed8\u3051\u52a0\u3048\u308b\u306e\u3082\u7c21\u5358\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n
Hello World\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092Cargo\u306b\u5909\u63db\u3057\u307e\u3057\u3087\u3046\u3002Cargo\u3092\u4f7f\u3044\u306f\u3058\u3081\u308b\u305f\u3081\u306b\u6700\u521d\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u306e\u306f\u3001Cargo\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3067\u3059\u3002\u5e78\u3044\u306a\u3053\u3068\u306b\u3001Rust\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u305f\u3081\u306b\u5148\u306b\u5b9f\u884c\u3057\u305f\u30b9\u30af\u30ea\u30d7\u30c8\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067Cargo\u3092\u542b\u3093\u3067\u3044\u307e\u3059\u3002\u3082\u3057\u306a\u306b\u304b\u4ed6\u306e\u65b9\u6cd5\u3067Rust\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u306e\u3067\u3042\u308c\u3070\u3001\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u306b\u3064\u3044\u3066\u306e\u8a73\u7d30\u306a\u6307\u793a\u306b\u3064\u3044\u3066Cargo\u306eREADME\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u306e\u304c\u3088\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092Cargo\u5316\u3059\u308b\u306b\u306f\u30012\u3064\u306e\u3053\u3068\u3092\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002Cargo.toml\u3068\u3044\u3046\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u308b\u3053\u3068\u3068\u3001\u30bd\u30fc\u30b9\u30fb\u30d5\u30a1\u30a4\u30eb\u3092\u9069\u5207\u306a\u5834\u6240\u306b\u7f6e\u304f\u3053\u3068\u3067\u3059\u3002\u307e\u305a\u306f\u305d\u3061\u3089\u304b\u3089\u3084\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
$<\/span> mkdir <\/span>src\r\n$<\/span> mv <\/span>main.rs src\/main.rs\r\n<\/code><\/pre>\n
Cargo\u306f\u3001\u3042\u306a\u305f\u306e\u30bd\u30fc\u30b9\u30fb\u30d5\u30a1\u30a4\u30eb\u304csrc\u3068\u3044\u3046\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u4e2d\u306b\u7f6e\u304b\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u671f\u5f85\u3057\u307e\u3059\u3002\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306fREADME\u3068\u304b\u30e9\u30a4\u30bb\u30f3\u30b9\u60c5\u5831\u3068\u304b\u3001\u306a\u3093\u3067\u3042\u308c\u3042\u306a\u305f\u306e\u30b3\u30fc\u30c9\u306b\u95a2\u4fc2\u3057\u3066\u3044\u306a\u3044\u3082\u306e\u3092\u7f6e\u304f\u305f\u3081\u306b\u3068\u3063\u3066\u304a\u304f\u306e\u3067\u3059\u3002Cargo\u306f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u6574\u7406\u6574\u9813\u3057\u3066\u304a\u304f\u306e\u3092\u52a9\u3051\u3066\u304f\u308c\u307e\u3059\u3002\u5168\u3066\u306e\u3082\u306e\u306b\u305d\u306e\u305f\u3081\u306e\u5834\u6240\u304c\u3042\u308a\u3001\u5168\u3066\u306e\u3082\u306e\u304c\u305d\u308c\u81ea\u8eab\u306e\u5834\u6240\u306b\u53ce\u307e\u308b\u306e\u3067\u3059\u3002<\/p>\n
\u6b21\u306b\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u3067\u3059\uff1a<\/p>\n
$<\/span> editor Cargo.toml\r\n<\/code><\/pre>\n
\u540d\u524d\u3092\u6b63\u3057\u304f\u3064\u3051\u308b\u3088\u3046\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002C\u306f\u5927\u6587\u5b57\u3067\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\uff01<\/p>\n
\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u4e2d\u306b\u6b21\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\uff1a<\/p>\n
[package]\r\n\r\nname = \"hello_world\"\r\nversion = \"0.0.1\"\r\nauthors = [ \"Your name <you@example.com>\" ]\r\n\r\n[[bin]]\r\n\r\nname = \"hello_world\"\r\n<\/code><\/pre>\n
\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u306fTOML\u5f62\u5f0f\u3067\u66f8\u304b\u308c\u3066\u3044\u307e\u3059\u3002TOML\u306e\u8aac\u660e\u306fTOML\u81ea\u8eab\u306b\u3084\u3063\u3066\u3082\u3089\u3044\u307e\u3057\u3087\u3046\uff1a<\/p>\n
TOML\u306f\u81ea\u660e\u306a\u610f\u5473\u8ad6\u3092\u6709\u3057\u3001\u305d\u306e\u304a\u852d\u3067\u8aad\u307f\u3084\u3059\u3044\u3001\u30df\u30cb\u30de\u30eb\u306a\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u5f62\u5f0f\u3067\u3042\u308b\u3053\u3068\u3092\u305d\u306e\u72d9\u3044\u3068\u3057\u3066\u3044\u307e\u3059\u3002TOML\u306f\u30cf\u30c3\u30b7\u30e5\u30fb\u30c6\u30fc\u30d6\u30eb\u306b\u66d6\u6627\u6027\u306a\u3057\u306b\u5199\u50cf(map)\u3067\u304d\u308b\u3088\u3046\u306b\u30c7\u30b6\u30a4\u30f3\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5e83\u7bc4\u306b\u308f\u305f\u308b\u69d8\u3005\u306a\u8a00\u8a9e\u3067\u3001TOML\u3092\u30c7\u30fc\u30bf\u69cb\u9020\u3078\u3068\u30d1\u30fc\u30ba\u3059\u308b\u3053\u3068\u306f\u5bb9\u6613\u306a\u306f\u305a\u3067\u3059\u3002TOML\u306fINI\u30d5\u30a1\u30a4\u30eb\u5f62\u5f0f\u306b\u3068\u3066\u3082\u3088\u304f\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u308c\u306b\u52a0\u3048\u3066\u30b9\u30c6\u30ad\u306a\u7279\u5fb4\u304c\u5e7e\u3064\u304b\u3042\u308a\u307e\u3059\u3002<\/p><\/blockquote>\n
\u3068\u3082\u304b\u304f\u3001\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u306f2\u3064\u306e \u30c6\u30fc\u30d6\u30eb \u3001package\u3068bin\u304c\u3042\u308a\u307e\u3059\u3002\u524d\u8005\u306fCargo\u306b\u3042\u306a\u305f\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3064\u3044\u3066\u306e\u30e1\u30bf\u30c7\u30fc\u30bf\u3092\u4f1d\u3048\u308b\u3082\u306e\u3067\u3059\u3002\u5f8c\u8005\u306fCargo\u306b\u3001\u79c1\u9054\u304c\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u306f\u306a\u304f\u30d0\u30a4\u30ca\u30ea\u3092\u30d3\u30eb\u30c9\u3057\u305f\u3044\u3068\u601d\u3063\u3066\u3044\u308b\u3053\u3068\uff08\u4e21\u65b9\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u306e\u3067\u3059\u304c\uff01\uff09\u3068\u3001\u66f4\u306b\u305d\u308c\u304c\u3069\u306e\u3088\u3046\u306a\u540d\u524d\u3092\u4ed8\u3051\u3089\u308c\u308b\u304b\u3092\u3001\u4f1d\u3048\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u6e96\u5099\u3067\u304d\u305f\u306a\u3089\u3001\u30d3\u30eb\u30c9\u306e\u7528\u610f\u304c\u51fa\u6765\u307e\u3057\u305f\uff01 \u6b21\u306e\u3088\u3046\u306b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> cargo build\r\n   Compiling hello_world v0.0.1 (file:\/\/\/home\/yourname\/projects\/hello_world)\r\n<\/span>$<\/span> .\/target\/hello_world\r\nHello, world!\r\n<\/span><\/code><\/pre>\n
\u30d0\u30fc\u30f3\uff01\u3000\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092cargo build\u3067\u30d3\u30eb\u30c9\u3057\u3001.\/target\/hello_world\u3067\u305d\u308c\u3092\u5b9f\u884c\u3057\u307e\u3057\u305f\u3002\u3044\u307e\u306e\u3068\u3053\u308d\u307e\u3060\u3001\u5358\u7d14\u306brustc\u3092\u4f7f\u3046\u5834\u5408\u306b\u6bd4\u3079\u3066\u5927\u3057\u305f\u3082\u306e\u304c\u624b\u306b\u5165\u3063\u305f\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u5c06\u6765\u3001\u3064\u307e\u308a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u304c\u3072\u3068\u3064\u3060\u3051\u3067\u306a\u304f\u8907\u6570\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u6301\u3064\u3088\u3046\u306b\u306a\u3063\u305f\u6642\u306e\u3053\u3068\u3092\u8003\u3048\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002rustc\u30922\u56de\u547c\u3093\u3067\u3001\u305d\u308c\u306b\u5927\u91cf\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u6e21\u3057\u3066\u5168\u90e8\u3092\u4e00\u7dd2\u306b\u30d3\u30eb\u30c9\u3059\u308b\u3088\u3046\u306b\u547d\u4ee4\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002Cargo\u304c\u3042\u308c\u3070\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u304c\u6210\u9577\u3059\u308b\u306b\u9023\u308c\u3066\u3082\u3001 \u305f\u3060cargo build\u3059\u308b\u3060\u3051\u3067\u6b63\u3057\u304f\u4f5c\u696d\u3092\u3057\u3066\u304f\u308c\u308b\u306e\u3067\u3059\u3002<\/p>\n
Cargo\u304cCargo.lock\u3068\u3044\u3046\u65b0\u3057\u3044\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u305f\u3053\u3068\u306b\u3082\u6c17\u304c\u3064\u3044\u305f\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
[root]\r\nname = \"hello_world\"\r\nversion = \"0.0.1\"\r\n<\/code><\/pre>\n
Cargo\u306f\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u3001\u3042\u306a\u305f\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u628a\u63e1\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\u3061\u3087\u3046\u3069\u3044\u307e\u306e\u3068\u3053\u308d\u306f\u3001\u4f9d\u5b58\u95a2\u4fc2\u304c\u306a\u3044\u306e\u3067\u3001\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u306f\u3061\u3087\u3063\u3068\u30b9\u30ab\u30b9\u30ab\u3057\u3066\u3044\u307e\u3059\u306d\u3002\u307f\u306a\u3055\u3093\u306f\u81ea\u5206\u3067\u306f\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u3044\u3058\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u308c\u306e\u53d6\u308a\u6271\u3044\u306fCargo\u306b\u4efb\u305b\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u4ee5\u4e0a\u3067\u3059\uff01 Cargo\u3092\u4f7f\u3063\u3066hello_world\u304c\u7121\u4e8b\u306b\u30d3\u30eb\u30c9\u3067\u304d\u307e\u3057\u305f\u3002\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u5358\u7d14\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u3042\u306a\u305f\u304cRust\u4eba\u751f\u306e\u6b8b\u308a\u3053\u308c\u304b\u3089\u305a\u3063\u3068\u4f7f\u3046\u3060\u308d\u3046\u30db\u30f3\u30e2\u30ce\u306e\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u3044\u308b\u306e\u3067\u3059\u3002<\/p>\n
\u3055\u3066\u3001\u30c4\u30fc\u30eb\u306f\u3053\u308c\u3067\u30de\u30b9\u30bf\u30fc\u3057\u305f\u308f\u3051\u3067\u3059\u304b\u3089\u3001\u5b9f\u969b\u306bRust\u8a00\u8a9e\u305d\u306e\u3082\u306e\u306b\u3064\u3044\u3066\u3082\u3063\u3068\u5b66\u3076\u3053\u3068\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u3089\u306f\u3001Rust\u3068\u904e\u3054\u3059\u6b8b\u308a\u306e\u6642\u9593\u3092\u901a\u3058\u3066\u305a\u3063\u3068\u5f79\u306b\u7acb\u3064\u3060\u308d\u3046\u57fa\u672c\u4e8b\u9805\u3067\u3059\u3002<\/p>\n
4. \u5909\u6570\u306e\u675f\u7e1b<\/h1>\n
\u6700\u521d\u306b\u5b66\u3076\u3053\u3068\u306b\u306a\u308b\u306e\u306f\u300c\u5909\u6570\u675f\u7e1b\u300d\u3067\u3059\u3002\u898b\u305f\u76ee\u306f\u3053\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u3059\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u591a\u304f\u306e\u8a00\u8a9e\u3067\u306f\u3001\u3053\u308c\u306f\u300c\u5909\u6570 variable\u300d\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001Rust\u306e\u5909\u6570\u675f\u7e1b\u306b\u306f\u5e7e\u3064\u304b\u96a0\u3057\u30c0\u30cd\u304c\u3042\u308b\u306e\u3067\u3059\u3002Rust\u306b\u306f\u300c\u30d1\u30bf\u30fc\u30f3\u30fb\u30de\u30c3\u30c1\u30f3\u30b0\u300d\u3068\u3044\u3046\u6975\u3081\u3066\u5f37\u529b\u306a\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002\u8a73\u7d30\u306f\u5f8c\u306b\u89e6\u308c\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u304c\u3001\u3068\u3082\u3042\u308c\u3001let\u5f0f\u306e\u5de6\u8fba\u306f\u5358\u306a\u308b\u5909\u6570\u540d\u3067\u306f\u306a\u304f\u3001\u5b8c\u5168\u306a\u30d1\u30bf\u30fc\u30f3\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u304c\u3069\u3046\u3044\u3046\u3053\u3068\u304b\u3068\u3044\u3046\u3068\u3001\u6b21\u306e\u3088\u3046\u306a\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\uff1a<\/p>\n
let<\/span> (<\/span>x<\/span>,<\/span> y<\/span>)<\/span> =<\/span> (<\/span>1<\/span>i<\/span>,<\/span> 2<\/span>i<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u5f0f\u304c\u8a55\u4fa1\u3055\u308c\u305f\u3042\u3068\u306b\u306f\u3001x\u306f1\u306b\u3001y\u306f2\u306b\u306a\u308a\u307e\u3059\u3002\u30d1\u30bf\u30fc\u30f3\u306f\u672c\u5f53\u306b\u5f37\u529b\u306a\u3082\u306e\u306a\u306e\u3067\u3059\u304c\u3001\u4eca\u306e\u3068\u3053\u308d\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u306f\u3053\u306e\u304f\u3089\u3044\u3067\u3059\u3002\u3053\u3053\u304b\u3089\u5148\u306b\u9032\u3093\u3067\u3044\u304f\u969b\u306b\u3001\u3053\u306e\u3053\u3068\u3092\u5fc3\u306b\u6b62\u3081\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u3068\u3053\u308d\u3067\u3001\u3053\u308c\u4ee5\u964d\u306e\u4f8b\u3067\u306f\u3001\u6570\u304c\u6574\u6570\u3067\u3042\u308b\u3053\u3068\u3092i\u306b\u3088\u3063\u3066\u8868\u3059\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n
Rust\u306f\u9759\u7684\u306b\u578b\u4ed8\u3051\u3055\u308c\u305f\u8a00\u8a9e\u3067\u3059\u3002\u3068\u3044\u3046\u3053\u3068\u306f\u3064\u307e\u308a\u3001\u524d\u3082\u3063\u3066\u578b\u3092\u6307\u5b9a\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u306a\u3089\u3070\u3001\u306a\u305c\u6700\u521d\u306eHello, World\u306e\u4f8b\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u305f\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u3075\u3080\u3001\u305d\u308c\u306fRust\u306b\u306f\u300c\u578b\u63a8\u8ad6\u300d\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u304c\u3042\u308b\u304b\u3089\u306a\u306e\u3067\u3059\u3002\u3082\u3057\u4f55\u304b\u304c\u3069\u3093\u306a\u578b\u3092\u6301\u3064\u306e\u304b\u3092Rust\u304c\u5224\u5225\u3067\u304d\u308b\u306e\u306a\u3089\u3070\u3001Rust\u306f\u307f\u306a\u3055\u3093\u306b\u308f\u3056\u308f\u3056\u305d\u308c\u3092\u30bf\u30a4\u30d7\u3057\u3066\u660e\u793a\u3057\u3066\u304f\u308c\u3068\u306f\u8981\u6c42\u3057\u307e\u305b\u3093\u3002<\/p>\n
\u3057\u304b\u3057\u3001\u3082\u3057\u305d\u3046\u3057\u305f\u3044\u306a\u3089\u3001\u578b\u3092\u52a0\u3048\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u3002\u578b\u306f\u30b3\u30ed\u30f3(:)\u306b\u3064\u3065\u3051\u3066\u66f8\u304d\u307e\u3059\uff1a<\/p>\n
let<\/span> x<\/span>:<\/span> int<\/span> =<\/span> 5<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u6559\u5ba4\u306e\u307f\u3093\u306a\u306e\u524d\u3067\u3053\u308c\u3092\u58f0\u306b\u51fa\u3057\u3066\u8aad\u3093\u3067\u307f\u3066\u3001\u3068\u8a00\u308f\u308c\u305f\u306a\u3089\u3070\u300cx\u306fint\u3068\u3044\u3046\u578b\u3092\u6301\u3061\u3001\u5024\u304c5\u3067\u3042\u308b\u3088\u3046\u306a\u675f\u7e1b\u3067\u3059\u3002\u300d\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u5909\u6570\u306f \u5909\u66f4\u4e0d\u80fd immutable \u3067\u3059\u3002\u6b21\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u307e\u305b\u3093\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\nx<\/span> =<\/span> 10<\/span>i<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3067\u3057\u3087\u3046\uff1a<\/p>\n
error: re-assignment of immutable variable `x`\r\n<\/span>     x = 10i;<\/span>\r\n     ^~~~~~~\r\n<\/span><\/code><\/pre>\n
\u3082\u3057\u5909\u66f4\u53ef\u80fd\u306a\u675f\u7e1b\u304c\u6b32\u3057\u3051\u308c\u3070\u3001mut\u3092\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
let<\/span> mut<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\nx<\/span> =<\/span> 10<\/span>i<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5909\u6570\u675f\u7e1b\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u4e0d\u5909\u3067\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u306b\u306f\u3001\u8907\u6570\u306e\u7406\u7531\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001Rust\u306e\u4e3b\u8981\u306a\u95a2\u5fc3\u3001\u3064\u307e\u308a\u5b89\u5168\u6027\u3092\u901a\u3057\u3066\u305d\u308c\u3092\u898b\u3066\u307f\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u3002\u4eee\u306b\u3001mut\u3068\u8a00\u3044\u5fd8\u308c\u305f\u3068\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3059\u308b\u3068\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u305d\u308c\u3092\u6355\u6349\u3057\u3066\u3001\u5909\u66f4\u3059\u308b\u3064\u3082\u308a\u304c\u306a\u304b\u3063\u305f\u306f\u305a\u306e\u3082\u306e\u3092\u5909\u66f4\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3088\u3001\u3068\u6559\u3048\u3066\u304f\u308c\u308b\u306e\u3067\u3059\u3002\u3082\u3057\u5909\u6570\u675f\u7e1b\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u5909\u66f4\u53ef\u80fd\u3060\u3063\u305f\u3068\u3057\u305f\u3089\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3042\u306a\u305f\u306b\u3053\u308c\u3092\u901a\u77e5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u304b\u3063\u305f\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u3082\u3057\u3042\u306a\u305f\u304c \u672c\u5f53\u306b \u5909\u66f4\u3092\u610f\u56f3\u3057\u3066\u3044\u305f\u306e\u3060\u3068\u3057\u305f\u3089\u3001\u89e3\u6c7a\u7b56\u306f\u5b9f\u306b\u7c21\u5358\u3067\u3059\u3002mut\u3092\u4ed8\u3051\u52a0\u3048\u308c\u3070\u3044\u3044\u306e\u3067\u3059\u3002<\/p>\n
\u53ef\u80fd\u3067\u3042\u308b\u5834\u5408\u306b\u5909\u66f4\u53ef\u80fd\u306a\u72b6\u614b\u3068\u3044\u3046\u3082\u306e\u3092\u56de\u907f\u3059\u308b\u3053\u3068\u306b\u306f\u4ed6\u306b\u3082\u5341\u5206\u306a\u7406\u7531\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u305d\u308c\u306f\u3053\u306e\u30ac\u30a4\u30c9\u306e\u7bc4\u56f2\u3092\u8d85\u3048\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u4e00\u822c\u7684\u306b\u3044\u3063\u3066\u3001\u675f\u7e1b\u306e\u660e\u793a\u7684\u306a\u5909\u66f4\u3068\u3044\u3046\u306e\u306f\u3057\u3070\u3057\u3070\u56de\u907f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3082\u306e\u3067\u3059\u3057\u3001\u305d\u308c\u3086\u3048\u3001Rust\u3067\u306f\u305d\u3046\u3059\u308b\u3053\u3068\u304c\u671b\u307e\u3057\u3044\u306e\u3067\u3059\u3002\u3068\u306f\u3044\u3046\u3082\u306e\u306e\u3001\u6642\u306b\u306f\u675f\u7e1b\u306e\u5909\u66f4\u304c\u5fc5\u8981\u3068\u3059\u308b\u3082\u306e\u3060\u3068\u3044\u3046\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u304b\u3089\u3001\u7d76\u5bfe\u7684\u306b\u7981\u6b62\u3055\u308c\u3066\u306f\u3044\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n
\u675f\u7e1b\u306e\u8a71\u306b\u3082\u3069\u308a\u307e\u3057\u3087\u3046\u3002Rust\u306e\u5909\u6570\u675f\u7e1b\u306f\u3001\u3082\u3046\u3072\u3068\u3064\u4ed6\u306e\u8a00\u8a9e\u3068\u9055\u3063\u305f\u7279\u5fb4\u3092\u5099\u3048\u3066\u3044\u307e\u3059\u3002\u5909\u6570\u675f\u7e1b\u306f\u3001\u305d\u308c\u3092\u4f7f\u3046\u524d\u306b\u3042\u308b\u5024\u3067\u521d\u671f\u5316\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3082\u3057\u6b21\u306e\u3088\u3046\u306b\u3057\u3066\u307f\u305f\u3089\u2026\u2026<\/p>\n
let<\/span> x<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u2026\u2026\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
src\/main.rs:2:9: 2:10 error: cannot determine a type for this local variable: unconstrained type\r\n<\/span>src\/main.rs:2     let x;<\/span>\r\n                      ^\r\n<\/span><\/code><\/pre>\n
\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u3053\u308c\u306b\u578b\u3092\u88dc\u5145\u3059\u308b\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u307e\u3059\uff1a<\/p>\n
let<\/span> x<\/span>:<\/span> int<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002src\/main.rs\u3092\u6b21\u306e\u3088\u3046\u306b\u5909\u66f4\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span>:<\/span> int<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"Hello world!\"<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u3067cargo build\u3092\u3064\u304b\u3063\u3066\u30d3\u30eb\u30c9\u3067\u304d\u308b\u306f\u305a\u3067\u3059\u3002\u8b66\u544a\u306f\u3067\u307e\u3059\u304c\u3001\u305d\u308c\u3067\u3082\u306a\u304a\u3001”Hello, world!”\u3068\u8868\u793a\u3055\u308c\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n
   Compiling hello_world v0.0.1 (file:\/\/\/home\/you\/projects\/hello_world)\r\n<\/span>src\/main.rs:2:9: 2:10 warning: unused variable: `x`, #<\/span>[<\/span>warn(<\/span>unused_variable)]<\/span> on by default\r\nsrc\/main.rs:2     let x: int;<\/span>\r\n                             ^\r\n<\/span><\/code><\/pre>\n
Rust\u306f\u3001\u5909\u6570\u675f\u7e1b\u3092\u307e\u3063\u305f\u304f\u5229\u7528\u3057\u3066\u3044\u306a\u3044\u3068\u8b66\u544a\u3057\u3066\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u307e\u3055\u306b\u5168\u304f\u5229\u7528\u3057\u3066\u3044\u306a\u3044\u308f\u3051\u3067\u3059\u304b\u3089\u3001\u4f55\u306e\u5bb3\u3082\u4f55\u306e\u8aa4\u308a\u3082\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u3053\u306ex\u3092\u5b9f\u969b\u306b\u5229\u7528\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u306a\u308b\u3068\u3001\u8a71\u306f\u5225\u3067\u3059\u3002\u3084\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5909\u66f4\u3057\u3066\u6b21\u306e\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span>:<\/span> int<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The value of x is: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3067\u3001\u30d3\u30eb\u30c9\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u6b21\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u304c\u51fa\u308b\u306f\u305a\u3067\u3059\uff1a<\/p>\n
$<\/span> cargo build\r\n   Compiling hello_world v0.0.1 (file:\/\/\/home\/you\/projects\/hello_world)\r\nsrc\/main.rs:4:39: 4:40 error: use of possibly uninitialized variable: `x`\r\n<\/span>src\/main.rs:4     println!(\"The value of x is: {}\", x);<\/span>\r\n                                                    ^\r\nnote: in expansion of format_args!\r\n<\/span><std macros><\/span>:2:23: 2:77 note: expansion site\r\n<std macros><\/span>:1:1: 3:2 note: in <\/span>expansion of println!\r\nsrc\/main.rs:4:5: 4:42 note: expansion site\r\nerror: aborting due to previous error\r\nCould not compile `hello_world`.\r\n<\/span><\/code><\/pre>\n
Rust\u306f\u3001\u521d\u671f\u5316\u3055\u308c\u3066\u306a\u3044\u5024\u3092\u4f7f\u7528\u3055\u305b\u3066\u304f\u308c\u307e\u305b\u3093\u3002\u3068\u3082\u304b\u304f\u6b21\u306b\u3001\u4e0a\u3067println!\u306b\u8ffd\u52a0\u3055\u308c\u305f\u3082\u306e\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u8868\u793a\u3059\u308b\u6587\u5b57\u5217\u306b2\u3064\u306e\u6ce2\u62ec\u5f27\uff08\u3064\u307e\u308a{}\u3067\u3059\u304c\u3001\u3053\u308c\u306f\u30d2\u30b2\u3068\u547c\u3070\u308c\u305f\u308a\u3057\u307e\u3059\uff09\u3092\u542b\u3081\u308b\u3068\u3001Rust\u306f\u3053\u308c\u3092\u3001\u3042\u308b\u306a\u3093\u3089\u304b\u306e\u7a2e\u985e\u306e\u5024\u3092\u5185\u633f\u305b\u3088\u3068\u3044\u3046\u8981\u6c42\u3068\u3057\u3066\u89e3\u91c8\u3057\u307e\u3059\u3002 \u6587\u5b57\u5217\u306e\u5185\u633f \u3068\u3044\u3046\u306e\u306f\u8a08\u7b97\u6a5f\u79d1\u5b66\u306e\u7528\u8a9e\u3067\u3001\u300c\u6587\u5b57\u5217\u306e\u4e2d\u306b\u8cbc\u308a\u3053\u3080\u300d\u3068\u3044\u3046\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u30ab\u30f3\u30de,\u3068\u305d\u308c\u304b\u3089x\u3092\u4ed8\u3051\u52a0\u3048\u308b\u3053\u3068\u3067\u3001x\u304c\u5185\u633f\u3057\u305f\u3044\u5024\u3060\u3068\u3044\u3046\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002\u3053\u306e\u30ab\u30f3\u30de\u306f\u51fd\u6570\u3068\u30de\u30af\u30ed\u306b\u5f15\u304d\u6e21\u3059\u5f15\u6570\u3092\u3001\u3072\u3068\u3064\u3060\u3051\u3067\u306a\u304f\u8907\u6570\u6e21\u3059\u5834\u5408\u306b\u3001\u5206\u96e2\u3059\u308b\u305f\u3081\u306b\u7528\u3044\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u5358\u306b\u6ce2\u62ec\u5f27\u3092\u4f7f\u3046\u5834\u5408\u306b\u306f\u3001Rust\u306f\u305d\u306e\u5024\u306e\u578b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3001\u305d\u308c\u304c\u6709\u610f\u5473\u306a\u3082\u306e\u306b\u306a\u308b\u3088\u3046\u306b\u5024\u3092\u8868\u793a\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002\u3082\u3057\u3001\u3088\u308a\u8a73\u7d30\u306b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u6307\u5b9a\u3057\u305f\u3044\u306a\u3089\u3070\u3001\u5229\u7528\u3067\u304d\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u304c\u591a\u6570\u3042\u308a\u307e\u3059\u304c\u3001\u3044\u307e\u306e\u3068\u3053\u308d\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u306b\u3057\u305f\u304c\u3063\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002\u6574\u6570\u3092\u8868\u793a\u3059\u308b\u3068\u3044\u3046\u306e\u306f\u305d\u308c\u307b\u3069\u8fbc\u307f\u5165\u3063\u305f\u8a71\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304b\u3089\u3002<\/p>\n
5. If<\/h1>\n
Rust\u304c\u3069\u306e\u3088\u3046\u306bif\u5f62\u5f0f\u3092\u53d6\u308a\u8fbc\u3093\u3067\u3044\u308b\u304b\u306f\u3001\u7279\u306b\u8907\u96d1\u3068\u3044\u3046\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u3088\u308a\u4f1d\u7d71\u7684\u306a\u30b7\u30b9\u30c6\u30e0\u8a00\u8a9e\u3088\u308a\u306f\u3001\u52d5\u7684\u306b\u578b\u4ed8\u3051\u3055\u308c\u305f\u8a00\u8a9e\u306b\u898b\u3089\u308c\u308b\u3088\u3046\u306aif\u306e\u305d\u308c\u306b\u9065\u304b\u306b\u4f3c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u30cb\u30e5\u30a2\u30f3\u30b9\u3092\u3057\u3063\u304b\u308a\u628a\u63e1\u3057\u3066\u3082\u3089\u3046\u305f\u3081\u306b\u3001\u305d\u308c\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
if\u306f\u3001\u300c\u5206\u5c90 branch\u300d\u3068\u3044\u3046\u3001\u3088\u308a\u4e00\u822c\u7684\u306a\u6982\u5ff5\u306e\u7279\u5b9a\u7684\u306a\u4e00\u5f62\u5f0f\u3067\u3059\u3002\u300c\u5206\u5c90 branch\u300d\u3068\u3044\u3046\u540d\u524d\u306f\u3001\u6728\u306e\u300c\u679d branch\u300d\u304b\u3089\u6765\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u305d\u3053\u3067\u306e\u9078\u629e\u306b\u5fdc\u3058\u3066\u8907\u6570\u306e\u7d4c\u8def\u304c\u53d6\u3089\u308c\u3046\u308b\u3088\u3046\u306a\u3001\u6c7a\u5b9a\u5730\u70b9\u306e\u3053\u3068\u3092\u3044\u3044\u307e\u3059\u3002<\/p>\n
if\u306e\u5834\u5408\u306b\u306f\u30012\u3064\u306e\u7d4c\u8def\u306b\u3064\u306a\u304c\u308b1\u3064\u306e\u9078\u629e\u304c\u3042\u308b\u308f\u3051\u3067\u3059\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n\r\nif<\/span> x<\/span> ==<\/span> 5<\/span>i<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"x is five!\"<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3082\u3057x\u306e\u5024\u3092\u4f55\u304b\u5225\u306e\u3082\u306e\u306b\u5909\u66f4\u3059\u308b\u3068\u3001\u3053\u306eprintln!\u306e\u884c\u306f\u30c6\u30ad\u30b9\u30c8\u3092\u8868\u793a\u3057\u306a\u304b\u3063\u305f\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u3088\u308a\u4ed4\u7d30\u306b\u8a00\u3048\u3070\u3001if\u306e\u5f8c\u306e\u5f0f\u304ctrue\u306b\u8a55\u4fa1\u3055\u308c\u308b\u306a\u3089\u3070\u30d6\u30ed\u30c3\u30af\u304c\u5b9f\u884c\u3055\u308c\u3001\u4ed6\u65b9\u3067\u3082\u3057\u305d\u308c\u304cfalse\u306a\u3089\u3001\u30d6\u30ed\u30c3\u30af\u306f\u5b9f\u884c\u3055\u308c\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n
\u3082\u3057false\u306e\u5834\u5408\u306b\u4f55\u304b\u304c\u8d77\u304d\u3066\u6b32\u3057\u3044\u306e\u306a\u3089\u3070\u3001else\u3092\u4f7f\u3044\u307e\u3059\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n\r\nif<\/span> x<\/span> ==<\/span> 5<\/span>i<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"x is five!\"<\/span>);<\/span>\r\n}<\/span> else<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"x is not five :(\"<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u306f\u3069\u308c\u3082\u3054\u304f\u6a19\u6e96\u7684\u306a\u3082\u306e\u3067\u3059\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u3053\u3046\u3044\u3046\u3053\u3068\u3082\u3067\u304d\u308b\u306e\u3067\u3059\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n\r\nlet<\/span> y<\/span> =<\/span> if<\/span> x<\/span> ==<\/span> 5<\/span>i<\/span> {<\/span>\r\n    10<\/span>i<\/span>\r\n}<\/span> else<\/span> {<\/span>\r\n    15<\/span>i<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u306f\u6b21\u306e\u3088\u3046\u306b\u66f8\u304f\u3053\u3068\u3082\u3067\u304d\u307e\u3059\uff08\u305d\u3057\u3066\u6050\u3089\u304f\u305d\u3046\u66f8\u304f\u3079\u304d\u3067\u3059\uff09\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n\r\nlet<\/span> y<\/span> =<\/span> if<\/span> x<\/span> ==<\/span> 5<\/span>i<\/span> {<\/span> 10<\/span>i<\/span> }<\/span> else<\/span> {<\/span> 15<\/span>i<\/span> };<\/span>\r\n<\/code><\/pre>\n
Rust\u306b\u3064\u3044\u3066\u30012\u3064\u306e\u8208\u5473\u6df1\u3044\u70b9\u304c\u3001\u3053\u3053\u304b\u3089\u660e\u3089\u304b\u306b\u306a\u308a\u307e\u3059\u3002Rust\u306f\u5f0f\u306b\u57fa\u3065\u304f\u8a00\u8a9e\u3067\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3001\u305d\u3057\u3066\u30bb\u30df\u30b3\u30ed\u30f3\u304c\u3001\u4ed6\u306e\u300c\u6ce2\u62ec\u5f27\u3068\u30bb\u30df\u30b3\u30ed\u30f3\u300d\u306b\u57fa\u3065\u304f\u8a00\u8a9e\u3067\u306e\u305d\u308c\u3068\u7570\u306a\u3063\u305f\u3082\u306e\u3067\u3042\u308b\u3053\u3068\u3001\u3067\u3059\u3002\u3053\u306e\u4e21\u8005\u306f\u95a2\u4fc2\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
5.1 \u5f0f vs. \u6587<\/h2>\n
Rust\u306f\u7b2c\u4e00\u7fa9\u7684\u306b\u306f\u5f0f\u306b\u57fa\u3065\u304f\u8a00\u8a9e\u3067\u3059\u3002Rust\u306b\u306f\u6587\u306f2\u7a2e\u985e\u3057\u304b\u306a\u304f\u3001\u6b8b\u308a\u306e\u5168\u3066\u306f\u5f0f\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u305d\u306e\u9055\u3044\u306f\u306a\u3093\u3067\u3057\u3087\u3046\u304b\u3002\u5f0f\u306f\u5024\u3092\u8fd4\u3057\u307e\u3059\u304c\u3001\u6587\u306f\u5024\u3092\u8fd4\u3057\u307e\u305b\u3093\u3002\u591a\u304f\u306e\u8a00\u8a9e\u3067\u306f\u3001if\u306f\u6587\u3067\u3042\u308a\u3001let x = if …\u306f\u610f\u5473\u3092\u306a\u3057\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001Rust\u3067\u306f\u3001if\u306f\u5f0f\u3067\u3042\u308a\u3001\u3064\u307e\u308a\u3001\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u306a\u306e\u3067\u3001\u3053\u306e\u5024\u3092\u675f\u7e1b\u306e\u521d\u671f\u5316\u306b\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u3053\u3068\u306b\u3064\u3044\u3066\u8a00\u3063\u3066\u304a\u304f\u3068\u3001\u675f\u7e1b\u306fRust\u306b\u3042\u308b2\u3064\u306e\u6587\u306e\u7a2e\u985e\u306e\u3046\u3061\u7b2c1\u306e\u3082\u306e\u3067\u3059\u3002\u6b63\u3057\u3044\u540d\u79f0\u306f \u5ba3\u8a00\u6587 \u3068\u3044\u3044\u307e\u3059\u3002\u3053\u308c\u307e\u3067\u306e\u3068\u3053\u308d\u3001let\u306f\u6211\u3005\u304c\u76ee\u306b\u3057\u305f\u552f\u4e00\u306e\u7a2e\u985e\u306e\u5ba3\u8a00\u6587\u3067\u3059\u3002\u305d\u3053\u3067\u3001\u66f4\u306b\u5e7e\u3064\u304b\u306e\u5ba3\u8a00\u6587\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u5909\u6570\u675f\u7e1b\u304c\u3001\u5358\u306b\u6587\u3068\u3057\u3066\u3067\u306f\u306a\u304f\u3001\u5f0f\u3068\u3057\u3066\u66f8\u3051\u308b\u8a00\u8a9e\u3082\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070Ruby\u306e\u3088\u3046\u306b\uff1a<\/p>\n
x<\/span> =<\/span> y<\/span> =<\/span> 5<\/span>\r\n<\/code><\/pre>\n
\u3057\u304b\u3057\u306a\u304c\u3089\u3001Rust\u3067\u306flet\u3092\u675f\u7e1b\u306e\u5c0e\u5165\u306b\u4f7f\u3046\u3053\u3068\u306f\u5f0f\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u6b21\u306e\u3088\u3046\u306b\u3059\u308b\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30a8\u30e9\u30fc\u3092\u751f\u3058\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> (<\/span>let<\/span> y<\/span> =<\/span> 5<\/span>i<\/span>);<\/span> \/\/ expected identifier, found keyword `let`<\/span>\r\n<\/code><\/pre>\n
\u3053\u3053\u3067\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u8a00\u3063\u3066\u3044\u308b\u306e\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u5f0f\u306e\u958b\u59cb\u304c\u898b\u3064\u304b\u308b\u3053\u3068\u3092\u671f\u5f85\u3057\u3066\u3044\u305f\u306e\u3060\u304clet\u304c\u898b\u3064\u304b\u3063\u3066\u3057\u307e\u3044\u3001\u305d\u3057\u3066let\u306f\u5f0f\u3067\u306f\u306a\u304f\u6587\u3092\u59cb\u3081\u308b\u3053\u3068\u3057\u304b\u3067\u304d\u306a\u3044\u305e\u3001\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n
\u65e2\u306b\u675f\u7e1b\u3055\u308c\u305f\u5909\u6570\uff08\u305f\u3068\u3048\u3070 y = 5i\uff09\u306b\u5bfe\u3059\u308b\u5272\u5f53\u306f\u3001\u305d\u306e\u5024\u304c\u7279\u306b\u6709\u7528\u3067\u3042\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u306f\u306a\u3044\u3082\u306e\u306e\u3001\u306a\u304a\u4f9d\u7136\u3068\u3057\u3066\u5f0f\u3067\u3042\u308b\u3001\u3068\u3044\u3046\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5272\u5f53\u304c\u5272\u5f53\u3055\u308c\u305f\u5024\u3078\u3068\u8a55\u4fa1\u3055\u308c\u308b\uff08\u305f\u3068\u3048\u3070\u5148\u306e\u4f8b\u3067\u306f5i\uff09C\u3068\u306f\u9055\u3063\u3066\u3001Rust\u3067\u306f\u5272\u5f53\u306e\u5024\u306f\u30e6\u30cb\u30c3\u30c8\u578b\u306e\u5024()\u306b\u306a\u308a\u307e\u3059\uff08\u3053\u308c\u306b\u3064\u3044\u3066\u306f\u5f8c\u306b\u89e6\u308c\u307e\u3059\uff09\u3002<\/p>\n
Rust\u306b\u65bc\u3051\u308b\u6587\u306e\u7a2e\u985e\u306e\u7b2c2\u306f\u3001 \u5f0f\u6587 \u3067\u3059\u3002\u305d\u306e\u76ee\u7684\u306f\u4efb\u610f\u306e\u5f0f\u3092\u6587\u306b\u8ee2\u63db\u3059\u308b\u3053\u3068\u306b\u3042\u308a\u307e\u3059\u3002\u5b9f\u7528\u4e0a\u306e\u70b9\u304b\u3089\u8a00\u3048\u3070\u3001\u3053\u308c\u306fRust\u306e\u6587\u6cd5\u306f\u6587\u304c\u4ed6\u306e\u6587\u306b\u5f8c\u7d9a\u3059\u308b\u3053\u3068\u3092\u671f\u5f85\u3059\u308b\u3001\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u8907\u6570\u306e\u5f0f\u3092\u304a\u4e92\u3044\u304b\u3089\u5206\u96e2\u3059\u308b\u305f\u3081\u306b\u306f\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u4f7f\u3046\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u3053\u306e\u3053\u3068\u306f\u3001\u5404\u884c\u306e\u7d42\u7aef\u306b\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u4f7f\u3046\u3053\u3068\u3092\u8981\u6c42\u3059\u308b\u4ed6\u306e\u8a00\u8a9e\u306e\u6b86\u3069\u3068Rust\u306e\u898b\u304b\u3051\u304c\u3088\u304f\u4f3c\u3066\u3044\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002Rust\u3067\u76ee\u306b\u3059\u308b\u6b86\u3069\u3069\u306e\u884c\u306e\u7d42\u7aef\u306b\u3082\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u76ee\u306b\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u3053\u3053\u3067\u300c\u6b86\u3069\u300d\u3068\u8a00\u308f\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u304b\u3063\u305f\u306e\u306f\u3069\u3093\u306a\u4f8b\u5916\u306e\u305b\u3044\u3067\u3057\u3087\u3046\u304b\uff1f \u307f\u306a\u3055\u3093\u306f\u65e2\u306b\u305d\u308c\u3092\u76ee\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30b3\u30fc\u30c9\u3067\u3059\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n\r\nlet<\/span> y<\/span>:<\/span> int<\/span> =<\/span> if<\/span> x<\/span> ==<\/span> 5<\/span>i<\/span> {<\/span> 10<\/span>i<\/span> }<\/span> else<\/span> {<\/span> 15<\/span>i<\/span> };<\/span>\r\n<\/code><\/pre>\n
y\u306f\u6574\u6570\u3067\u3042\u3063\u3066\u6b32\u3057\u3044\u3068\u3044\u3046\u3053\u3068\u3092\u660e\u793a\u7684\u306b\u6307\u5b9a\u3059\u308b\u305f\u3081\u306b\u3001y\u306b\u578b\u8a3b\u91c8\u3092\u52a0\u3048\u305f\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u3053\u308c\u306f\u6b21\u306e\u3082\u306e\u3068\u306f\u540c\u3058\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u3061\u3089\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u307e\u305b\u3093\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n\r\nlet<\/span> y<\/span>:<\/span> int<\/span> =<\/span> if<\/span> x<\/span> ==<\/span> 5<\/span>i<\/span> {<\/span> 10<\/span>i<\/span>;<\/span> }<\/span> else<\/span> {<\/span> 15<\/span>i<\/span>;<\/span> };<\/span>\r\n<\/code><\/pre>\n
10\u306815\u306e\u5f8c\u306b\u3042\u308b\u30bb\u30df\u30b3\u30ed\u30f3\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002Rust\u306f\u6b21\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n
error: mismatched types: expected `int` but found `()` (expected int but found ())\r\n<\/span><\/code><\/pre>\n
\u6574\u6570\u3092\u671f\u5f85\u3057\u3066\u3044\u305f\u306e\u306b\u3001\u51fa\u3066\u304d\u305f\u306e\u306f()\u3067\u3059\u3002()\u306f\u300c\u30e6\u30cb\u30c3\u30c8\u300d\u3068\u767a\u97f3\u3055\u308c\u3001Rust\u306e\u578b\u30b7\u30b9\u30c6\u30e0\u306b\u65bc\u3051\u308b\u3042\u308b\u7279\u5225\u306a\u578b\u3067\u3059\u3002Rust\u3067\u306f()\u306fint\u578b\u306e\u5909\u6570\u306b\u5bfe\u3059\u308b\u6709\u52b9\u306a\u5024\u3068\u306f\u306a\u308a\u307e\u305b\u3093\u3002()\u3068\u3044\u3046\u578b\u306e\u5909\u6570\u306b\u5bfe\u3057\u3066\u6709\u52b9\u306a\u5024\u306f\u552f\u4e00()\u306e\u307f\u3067\u3042\u308a\u3001\u3053\u306e\u5024\u306f\u7279\u306b\u5f79\u306b\u7acb\u3061\u307e\u305b\u3093\u3002\u6587\u306f\u5024\u3092\u8fd4\u3055\u306a\u3044\u3001\u3068\u3044\u3063\u305f\u3053\u3068\u3092\u899a\u3048\u3066\u3044\u307e\u3059\u304b\uff1f \u3088\u308d\u3057\u3044\u3001\u305d\u308c\u304c\u3053\u306e\u5834\u5408\u306b\u304a\u3051\u308b\u30e6\u30cb\u30c3\u30c8\u306e\u76ee\u7684\u3067\u3059\u3002\u30bb\u30df\u30b3\u30ed\u30f3\u306f\u4efb\u610f\u306e\u5f0f\u3092\u6587\u306b\u8ee2\u63db\u3057\u3001\u305d\u306e\u5f0f\u306e\u5024\u3092\u6295\u3052\u6368\u3066\u3066\u3001\u4ee3\u308f\u308a\u306b\u30e6\u30cb\u30c3\u30c8\u3092\u8fd4\u3059\u306e\u3067\u3059\u3002<\/p>\n
Rust\u306e\u30b3\u30fc\u30c9\u3067\u3001\u884c\u672b\u306b\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u76ee\u306b\u3057\u306a\u3044\u3082\u3046\u3072\u3068\u3064\u306e\u6642\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u306b\u3064\u3044\u3066\u8aac\u660e\u3059\u308b\u306b\u306f\u3001\u6b21\u306b\u6271\u3046\u6982\u5ff5\u3001\u3064\u307e\u308a\u51fd\u6570\u3001\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n
6. \u51fd\u6570<\/h1>\n
\u3053\u308c\u307e\u3067\u306b\u51fd\u6570\u3092\u3072\u3068\u3064\u306f\u76ee\u306b\u3057\u3066\u3044\u307e\u3059\u3088\u306d\u3002\u3064\u307e\u308amain\u51fd\u6570\u3067\u3059\uff1a<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u306f\u53ef\u80fd\u306a\u9650\u308a\u6700\u3082\u5358\u7d14\u306a\u51fd\u6570\u5ba3\u8a00\u3067\u3059\u3002\u65e2\u306b\u8ff0\u3079\u305f\u3088\u3046\u306b\u3001fn\u306f\u300c\u3053\u308c\u306f\u51fd\u6570\u3067\u3059\u300d\u3068\u544a\u3052\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u540d\u524d\u304c\u7d9a\u304d\u3001\u3053\u306e\u51fd\u6570\u306f\u5f15\u6570\u3092\u53d6\u308a\u307e\u305b\u3093\u304b\u3089\u62ec\u5f27\u304c\u5e7e\u3064\u304b\u3001\u305d\u3057\u3066\u672c\u4f53\u3092\u793a\u3059\u305f\u3081\u306b\u6ce2\u62ec\u5f27\u304c\u5e7e\u3064\u304b\u3001\u7d9a\u304d\u307e\u3059\u3002\u6b21\u306e\u3082\u306e\u306ffoo\u3068\u3044\u3046\u540d\u524d\u306e\u51fd\u6570\u3067\u3059\uff1a<\/p>\n
fn<\/span> foo<\/span>()<\/span> {<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5f15\u6570\u3092\u53d6\u308b\u5834\u5408\u306b\u306f\u3069\u3046\u3059\u308b\u306e\u3067\u3057\u3087\u3046\uff1f \u6570\u3092\u8868\u793a\u3059\u308b\u51fd\u6570\u306f\u3053\u3046\u306a\u308a\u307e\u3059\uff1a<\/p>\n
fn<\/span> print_number<\/span>(<\/span>x<\/span>:<\/span> int<\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"x is: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
print_number\u3092\u4f7f\u3063\u305f\u5b8c\u5168\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3053\u3046\u306a\u308a\u307e\u3059\uff1a<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    print_number<\/span>(<\/span>5<\/span>);<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> print_number<\/span>(<\/span>x<\/span>:<\/span> int<\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"x is: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u898b\u3066\u306e\u901a\u308a\u3001\u51fd\u6570\u306e\u5f15\u6570\u306flet\u3068\u826f\u304f\u4f3c\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u5f15\u6570\u306e\u540d\u524d\u306b\u578b\u3092\u3064\u3051\u308b\u306e\u3067\u3059\u3002\u578b\u306f\u30b3\u30ed\u30f3\u306e\u5f8c\u306b\u66f8\u304d\u307e\u3059\u3002<\/p>\n
2\u3064\u306e\u6570\u3092\u4e00\u7dd2\u306b\u52a0\u7b97\u3057\u3066\u8868\u793a\u3059\u308b\u5b8c\u5168\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3053\u3046\u3067\u3059\uff1a<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    print_sum<\/span>(<\/span>5<\/span>,<\/span> 6<\/span>);<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> print_sum<\/span>(<\/span>x<\/span>:<\/span> int<\/span>,<\/span> y<\/span>:<\/span> int<\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"sum is: {}\"<\/span>,<\/span> x<\/span> +<\/span> y<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5f15\u6570\u306f\u30ab\u30f3\u30de\u3067\u5206\u96e2\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u51fd\u6570\u3092\u5ba3\u8a00\u3059\u308b\u6642\u3060\u3051\u3067\u306a\u304f\u3001\u51fd\u6570\u3092\u547c\u3073\u51fa\u3059\u3068\u304d\u306b\u3082\u305d\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n
let\u3068\u306f\u9055\u3044\u3001\u51fd\u6570\u306e\u5f15\u6570\u306e\u578b\u306f\u5ba3\u8a00\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002\u3067\u3059\u304b\u3089\u3001\u6b21\u306e\u3088\u3046\u306b\u3059\u308b\u3068\u4e0a\u624b\u304f\u884c\u304d\u307e\u305b\u3093\uff1a<\/p>\n
fn<\/span> print_number<\/span>(<\/span>x<\/span>,<\/span> y<\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"x is: {}\"<\/span>,<\/span> x<\/span> +<\/span> y<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u306f\u6b21\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n
hello.rs:5:18: 5:19 error: expected `:` but found `,`\r\nhello.rs:5 fn print_number(x, y) {\r\n<\/span><\/code><\/pre>\n
\u3053\u306e\u8a00\u8a9e\u30c7\u30b6\u30a4\u30f3\u306f\u610f\u56f3\u7684\u306b\u306a\u3055\u308c\u305f\u3082\u306e\u3067\u3059\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5168\u9762\u306b\u308f\u305f\u3063\u3066\u578b\u63a8\u8ad6\u3092\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001Haskell\u306e\u3088\u3046\u306b\u305d\u3046\u3057\u305f\u578b\u63a8\u8ad6\u3092\u6301\u3063\u3066\u3044\u308b\u8a00\u8a9e\u3067\u306f\u3001\u578b\u3092\u660e\u793a\u3059\u308b\u3053\u3068\u304c\u30d9\u30b9\u30c8\u30fb\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3067\u3042\u308b\u3068\u3055\u308c\u308b\u3053\u3068\u304c\u3057\u3070\u3057\u3070\u3067\u3059\u3002\u79c1\u9054\u306f\u3001\u51fd\u6570\u306b\u306f\u578b\u3092\u5ba3\u8a00\u3059\u308b\u3088\u3046\u306b\u5f37\u5236\u3057\u3064\u3064\u51fd\u6570\u672c\u4f53\u306e\u5185\u90e8\u3067\u306f\u578b\u63a8\u8ad6\u3092\u8a31\u3059\u3001\u3068\u3044\u3046\u306e\u304c\u5168\u9762\u7684\u306a\u578b\u63a8\u8ad6\u3068\u578b\u63a8\u8ad6\u306a\u3057\u3068\u306e\u9593\u306e\u512a\u308c\u305f\u30b9\u30a4\u30fc\u30c8\u30b9\u30dd\u30c3\u30c8\u3067\u3042\u308b\u3068\u3044\u3046\u898b\u89e3\u306b\u9054\u3057\u307e\u3057\u305f\u3002<\/p>\n
\u51fd\u6570\u304b\u3089\u5024\u3092\u8fd4\u3059\u306b\u306f\u3069\u3046\u3057\u305f\u3089\u3044\u3044\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u3000\u6574\u6570\u306b1\u3092\u52a0\u3048\u308b\u51fd\u6570\u306f\u3053\u3046\u306a\u308a\u307e\u3059\uff1a<\/p>\n
fn<\/span> add_one<\/span>(<\/span>x<\/span>:<\/span> int<\/span>)<\/span> -><\/span> int<\/span> {<\/span>\r\n    x<\/span> +<\/span> 1<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Rust\u306e\u51fd\u6570\u306f\u3061\u3087\u3046\u3069\u3072\u3068\u3064\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u306e\u578b\u306f\u300c\u77e2\u5370\u300d\u306e\u3042\u3068\u306b\u5ba3\u8a00\u3057\u307e\u3059\u3002\u3053\u306e\u300c\u77e2\u5370\u300d\u306f\u30c0\u30c3\u30b7\u30e5(-)\u306b\u300c\u5927\u306a\u308a\u300d\u8a18\u53f7(>)\u3092\u7d9a\u3051\u3066\u66f8\u304d\u307e\u3059\u3002<\/p>\n
\u4e0a\u306e\u4f8b\u306b\u30bb\u30df\u30b3\u30ed\u30f3\u304c\u306a\u3044\u3053\u3068\u306b\u6c17\u304c\u3064\u3044\u305f\u3053\u3068\u3068\u601d\u3044\u307e\u3059\u3002\u3082\u3057\u305d\u308c\u3092\u4ed8\u3051\u52a0\u3048\u3066\u3057\u307e\u3046\u3068\uff1a<\/p>\n
fn<\/span> add_one<\/span>(<\/span>x<\/span>:<\/span> int<\/span>)<\/span> -><\/span> int<\/span> {<\/span>\r\n    x<\/span> +<\/span> 1<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n
error: not all control paths return a value\r\n<\/span>fn add_one(x: int) -><\/span> int {<\/span>\r\n     x + 1;<\/span>\r\n}\r\n\r\nnote: consider removing this semicolon:\r\n<\/span>     x + 1;<\/span>\r\n          ^\r\n<\/span><\/code><\/pre>\n
\u30bb\u30df\u30b3\u30ed\u30f3\u3068()\u306b\u3064\u3044\u3066\u4ee5\u524d\u306b\u8a71\u3092\u3057\u305f\u306e\u3092\u899a\u3048\u3066\u3044\u307e\u3059\u304b\uff1f \u3053\u306e\u51fd\u6570\u306fint \u3092\u8fd4\u3059\u3068\u5ba3\u8a00\u3057\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u30bb\u30df\u30b3\u30ed\u30f3\u304c\u3042\u308b\u3068\u4ee3\u308f\u308a\u306b()\u3092\u8fd4\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u306b\u306a\u308b\u306e\u3067\u3059\u3002Rust\u306f\u3001\u3053\u308c\u304c\u6050\u3089\u304f\u79c1\u9054\u306e\u3084\u308a\u305f\u3044\u3053\u3068\u3067\u306f\u306a\u3044\u3001\u3068\u7406\u89e3\u3057\u3066\u3001\u3053\u306e\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u53d6\u308a\u9664\u304f\u3053\u3068\u3092 \u63d0\u6848\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306f\u524d\u306b\u51fa\u3066\u304d\u305fif\u6587\u306b\u5927\u5909\u3088\u304f\u4f3c\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30d6\u30ed\u30c3\u30af({})\u306e\u7d50\u679c\u306f\u5f0f\u306e\u5024\u306b\u306a\u308b\u306e\u3067\u3059\u3002Ruby\u306e\u3088\u3046\u306a\u3001\u4ed6\u306e\u5f0f\u6307\u5411\u306e\u8a00\u8a9e\u3082\u3053\u308c\u3068\u540c\u3058\u3088\u3046\u306b\u52d5\u4f5c\u3057\u307e\u3059\u304c\u3001\u30b7\u30b9\u30c6\u30e0\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u754c\u3067\u306f\u3053\u308c\u306f\u3042\u307e\u308a\u898b\u307e\u305b\u3093\u3002\u4eba\u3005\u306f\u3001\u6700\u521d\u306b\u3053\u306e\u3053\u3068\u306b\u3064\u3044\u3066\u5b66\u3093\u3060\u6642\u306b\u306f\u3001\u3053\u308c\u304c\u30d0\u30b0\u3092\u62db\u304d\u5bc4\u305b\u308b\u306e\u3067\u306f\u306a\u3044\u304b\u3068\u60f3\u5b9a\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001Rust\u306e\u578b\u30b7\u30b9\u30c6\u30e0\u306f\u3068\u3066\u3082\u5f37\u529b\u3067\u3001\u30e6\u30cb\u30c3\u30c8\u306f\u305d\u308c\u81ea\u4f53\u3067\u3072\u3068\u3064\u306e\u30e6\u30cb\u30fc\u30af\u306a\u578b\u306a\u306e\u3067\u3001\u547c\u3073\u51fa\u3057\u5143\u3078\u8fd4\u308d\u3046\u3068\u3059\u308b\u4f4d\u7f6e\u3067\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u52a0\u3048\u305f\u308a\u9664\u3044\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u30d0\u30b0\u3092\u5f15\u304d\u8d77\u3053\u3059\u3001\u3068\u3044\u3046\u3088\u3046\u306a\u554f\u984c\u304c\u8d77\u304d\u305f\u3053\u3068\u306f\u307e\u3063\u305f\u304f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u3057\u304b\u3057\u3001\u3082\u3063\u3068\u65e9\u3044\u4f4d\u7f6e\u3067\u547c\u3073\u51fa\u3057\u5143\u306b\u8fd4\u308b\u306b\u306f\u3069\u3046\u3057\u305f\u3044\u3044\u306e\u3067\u3057\u3087\u3046\u304b\uff1f Rust\u306b\u306f\u305d\u306e\u305f\u3081\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3001return\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
fn<\/span> foo<\/span>(<\/span>x<\/span>:<\/span> int<\/span>)<\/span> -><\/span> int<\/span> {<\/span>\r\n    if<\/span> x<\/span> <<\/span> 5<\/span> {<\/span> return<\/span> x<\/span>;<\/span> }<\/span>\r\n\r\n    x<\/span> +<\/span> 1<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u51fd\u6570\u306e\u6700\u7d42\u884c\u3067return\u3092\u4f7f\u3063\u3066\u3082\u52d5\u4f5c\u306f\u3057\u307e\u3059\u304c\u3001\u3057\u304b\u3057\u3053\u308c\u306f\u3088\u304f\u306a\u3044\u30b9\u30bf\u30a4\u30eb\u3060\u3068\u8003\u3048\u3089\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n
fn<\/span> foo<\/span>(<\/span>x<\/span>:<\/span> int<\/span>)<\/span> -><\/span> int<\/span> {<\/span>\r\n    if<\/span> x<\/span> <<\/span> 5<\/span> {<\/span> return<\/span> x<\/span>;<\/span> }<\/span>\r\n\r\n    return<\/span> x<\/span> +<\/span> 1<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u51fd\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u306b\u306f\u4ed6\u306b\u3082\u65b9\u6cd5\u304c\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u306b\u306f\u307e\u3060\u5b66\u3093\u3067\u3044\u306a\u3044\u6a5f\u80fd\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u4eca\u306e\u3068\u3053\u308d\u305d\u308c\u306f\u305d\u306e\u3068\u304d\u306b\u3068\u3063\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
7. \u30b3\u30e1\u30f3\u30c8<\/h1>\n
\u51fd\u6570\u304c\u624b\u306b\u5165\u3063\u305f\u308f\u3051\u3067\u3059\u304b\u3089\u3001\u6b21\u306b\u30b3\u30e1\u30f3\u30c8\u306b\u3064\u3044\u3066\u5b66\u3076\u3068\u3044\u3046\u306e\u304c\u826f\u3044\u8003\u3048\u3067\u3057\u3087\u3046\u3002\u30b3\u30e1\u30f3\u30c8\u306f\u3001\u3042\u306a\u305f\u306e\u30b3\u30fc\u30c9\u306b\u3064\u3044\u3066\u8aac\u660e\u3059\u308b\u52a9\u3051\u3068\u3057\u3066\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30de\u306b\u6b8b\u3059\u6ce8\u8a18\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n
Rust\u306b\u306f\u3001\u307f\u306a\u3055\u3093\u304c\u5927\u4e8b\u306b\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u4e8c\u7a2e\u985e\u306e\u30b3\u30e1\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002\u884c\u30b3\u30e1\u30f3\u30c8\u3068\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u30fb\u30b3\u30e1\u30f3\u30c8\u3067\u3059\u3002<\/p>\n
\/\/ \u884c\u30b3\u30e1\u30f3\u30c8\u306f\u306a\u3093\u3067\u3042\u308c'\/\/'\u306e\u5f8c\u306b\u66f8\u304b\u308c\u305f\u3082\u306e\u3067\u3001\u305d\u306e\u884c\u306e\u884c\u672b\u307e\u3067\u3092\u7bc4\u56f2\u3068\u3057\u307e\u3059\u3002<\/span>\r\n\r\nlet<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span> \/\/ this is also a line comment.<\/span>\r\n\r\n\/\/ \u3082\u3057\u4f55\u304b\u306b\u3064\u3044\u3066\u9577\u3044\u8aac\u660e\u3092\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u306a\u3089\u3001\u884c\u30b3\u30e1\u30f3\u30c8\u3092\u304a\u4e92\u3044\u306b\u96a3\u308a\u5408\u308f\u305b\u3066<\/span>\r\n\/\/ \u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u8aad\u307f\u3084\u3059\u304f\u3059\u308b\u305f\u3081\u306b\u3001\/\/ \u3068\u30b3\u30e1\u30f3\u30c8\u3068\u306e\u9593\u306b\u306f\u30b9\u30da\u30fc\u30b9\u3092\u7a7a\u3051\u307e\u3057\u3087\u3046\u3002<\/span>\r\n\r\n<\/code><\/pre>\n
\u6b8b\u3063\u305f\u3082\u3046\u3072\u3068\u3064\u306e\u7a2e\u985e\u306e\u30b3\u30e1\u30f3\u30c8\u306f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u30fb\u30b3\u30e1\u30f3\u30c8\u3067\u3059\u3002\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u30fb\u30b3\u30e1\u30f3\u30c8\u306b\u306f\/\/\u3067\u306f\u306a\u304f\/\/\/\u3092\u4f7f\u3044\u307e\u3059\u3002\u305d\u306e\u4e2d\u3067\u306fMarkdown\u8a18\u6cd5\u304c\u4f7f\u3048\u307e\u3059\u3002<\/p>\n
\/\/\/ `hello` \u306f\u4e0e\u3048\u3089\u308c\u305f\u540d\u524d\u306b\u57fa\u3065\u3044\u3066\u30d1\u30fc\u30bd\u30ca\u30e9\u30a4\u30ba\u3055\u308c\u305f\u6328\u62f6\u3092\u8868\u793a\u3059\u308b\u51fd\u6570\u3067\u3042\u308b\u3002<\/span>\r\n\/\/\/<\/span>\r\n\/\/\/ # \u5f15\u6570<\/span>\r\n\/\/\/<\/span>\r\n\/\/\/ * `name` - \u6328\u62f6\u3057\u305f\u3044\u4eba\u306e\u540d\u524d<\/span>\r\n\/\/\/<\/span>\r\n\/\/\/ # \u4f7f\u7528\u4f8b<\/span>\r\n\/\/\/<\/span>\r\n\/\/\/ ```rust<\/span>\r\n\/\/\/ let name = \"Steve\";<\/span>\r\n\/\/\/ hello(name); \/\/ \"Hello, Steve!\" \u3068\u8868\u793a\u3059\u308b<\/span>\r\n\/\/\/ ```<\/span>\r\nfn<\/span> hello<\/span>(<\/span>name<\/span>:<\/span> &<\/span>str<\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Hello, {}!\"<\/span>,<\/span> name<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u30fb\u30b3\u30e1\u30f3\u30c8\u3092\u66f8\u304f\u969b\u306b\u306f\u3001\u3069\u306e\u5f15\u6570\u306b\u3064\u3044\u3066\u3082\u3001\u3069\u306e\u8fd4\u308a\u5024\u306b\u3064\u3044\u3066\u3082\u3001\u305d\u308c\u3054\u3068\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3092\u8a2d\u3051\u3001\u307e\u305f\u4f7f\u7528\u6cd5\u306b\u3064\u3044\u3066\u5e7e\u3064\u304b\u306e\u4f8b\u3092\u6319\u3052\u308b\u3068\u3001\u672c\u5f53\u306b\u672c\u5f53\u306b\u3001\u5f79\u306b\u305f\u3061\u307e\u3059\u3002<\/p>\n
rustdoc\u3068\u3044\u3046\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u3001\u3053\u308c\u3089\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u30fb\u30b3\u30e1\u30f3\u30c8\u304b\u3089HTML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002rustdoc\u306b\u3064\u3044\u3066\u306f\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u8a71\u3092\u3059\u308b\u3068\u3053\u308d\u307e\u3067\u3044\u3063\u3066\u304b\u3089\u89e6\u308c\u307e\u3059\u3002\u3068\u3044\u3046\u306e\u3082\u3001\u4e00\u822c\u7684\u306b\u3044\u3063\u3066\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u30a8\u30af\u30b9\u30dd\u30fc\u30c8\u3057\u305f\u3044\u306e\u306f\u3001\u3042\u308b\u3072\u3068\u3064\u306e\u30e2\u30b8\u30e5\u30fc\u30eb\u5168\u4f53\u306b\u5bfe\u3057\u3066\u306e\u3053\u3068\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n
8. \u8907\u5408\u30c7\u30fc\u30bf\u578b<\/h1>\n
Rust\u306f\u591a\u304f\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u540c\u69d8\u306b\u3001\u591a\u6570\u306e\u69d8\u3005\u306a\u7d44\u307f\u8fbc\u307f\u306e\u30c7\u30fc\u30bf\u578b\u3092\u5099\u3048\u3066\u3044\u307e\u3059\u3002\u65e2\u306b\u6574\u6570\u3068\u6587\u5b57\u5217\u3067\u3061\u3087\u3063\u3068\u3057\u305f\u7c21\u5358\u306a\u4f5c\u696d\u3092\u3057\u307e\u3057\u305f\u306d\u3002\u3057\u304b\u3057\u3001\u6b21\u306b\u3001\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u306e\u3001\u3088\u308a\u8fbc\u307f\u5165\u3063\u305f\u3055\u3089\u306a\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
8.1. \u30bf\u30d7\u30eb<\/h2>\n
\u6700\u521d\u306b\u8a71\u3092\u3059\u308b\u8907\u5408\u30c7\u30fc\u30bf\u578b\u306f \u30bf\u30d7\u30eb tuple \u3068\u547c\u3070\u308c\u308b\u3082\u306e\u3067\u3059\u3002\u30bf\u30d7\u30eb\u306f\u56fa\u5b9a\u30b5\u30a4\u30ba\u306e\u9806\u5e8f\u30ea\u30b9\u30c8\u3067\u3059\u3002\u3053\u3093\u306a\u611f\u3058\u3067\u3059\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> (<\/span>1<\/span>i<\/span>,<\/span> \"hello\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u62ec\u5f27\u3068\u30ab\u30f3\u30de\u306b\u3088\u3063\u3066\u3001\u3053\u306e\u9577\u30552\u306e\u30bf\u30d7\u30eb\u306f\u5f62\u6210\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u540c\u3058\u30b3\u30fc\u30c9\u3067\u3059\u304c\u3001\u578b\u8a3b\u91c8\u4ed8\u304d\u306e\u3082\u306e\u306f\u3053\u3046\u306a\u308a\u307e\u3059\uff1a<\/p>\n
let<\/span> x<\/span>:<\/span> (<\/span>int<\/span>,<\/span> &<\/span>str<\/span>)<\/span> =<\/span> (<\/span>1<\/span>,<\/span> \"hello\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u898b\u3066\u306e\u901a\u308a\u3001\u30bf\u30d7\u30eb\u306e\u578b\u306f\u307e\u3055\u306b\u30bf\u30d7\u30eb\u3068\u540c\u3058\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u305d\u308c\u305e\u308c\u306e\u4f4d\u7f6e\u306b\u3001\u5024\u3067\u306f\u306a\u304f\u578b\u540d\u304c\u5165\u308a\u307e\u3059\u3002\u6ce8\u610f\u6df1\u3044\u8aad\u8005\u306a\u3089\u3001\u30bf\u30d7\u30eb\u304c\u7570\u7a2e\u7684(heterogenous)\u3067\u3042\u308b\u3053\u3068\u306b\u6c17\u304c\u3064\u304f\u3067\u3057\u3087\u3046\u3002\u3064\u307e\u308a\u3001\u3053\u306e\u30bf\u30d7\u30eb\u306b\u306fint\u3068&str\u304c\u5165\u3063\u3066\u3044\u307e\u3059\u3002&str\u3068\u3044\u3046\u578b\u306f\u307e\u3060\u898b\u305f\u3053\u3068\u304c\u306a\u3044\u3067\u3057\u3087\u3046\u304c\u3001\u6587\u5b57\u5217\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u5f8c\u3067\u304a\u8a71\u3057\u307e\u3057\u3087\u3046\u3002\u30b7\u30b9\u30c6\u30e0\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306b\u65bc\u3044\u3066\u306f\u3001\u6587\u5b57\u5217\u306f\u4ed6\u306e\u8a00\u8a9e\u306e\u5834\u5408\u306b\u6bd4\u3079\u3066\u5c11\u3057\u3070\u304b\u308a\u8907\u96d1\u306a\u3082\u306e\u306a\u306e\u3067\u3059\u3002\u3044\u307e\u306e\u3068\u3053\u308d\u306f\u3001\u305f\u3060&str\u3092\u300c\u6587\u5b57\u5217\u30b9\u30e9\u30a4\u30b9\u300d\u3068\u8aad\u3093\u3067\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u308c\u4ee5\u4e0a\u306e\u3053\u3068\u306f\u3059\u3050\u5f8c\u306b\u5b66\u7fd2\u3057\u307e\u3059\u3002<\/p>\n
\u30bf\u30d7\u30eb\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u306f *\u69cb\u9020\u5206\u89e3\u306elet * \u3068\u3044\u3046\u3082\u306e\u3092\u4f7f\u3063\u3066\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\u3002\u3053\u308c\u304c\u305d\u306e\u4f8b\u3067\u3059\uff1a<\/p>\n
let<\/span> (<\/span>x<\/span>,<\/span> y<\/span>,<\/span> z<\/span>)<\/span> =<\/span> (<\/span>1<\/span>i<\/span>,<\/span> 2<\/span>i<\/span>,<\/span> 3<\/span>i<\/span>);<\/span>\r\n\r\nprintln!<\/span>(<\/span>\"x is {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u524d\u306b\u3001let\u6587\u306e\u5de6\u8fba\u306f\u5358\u306b\u675f\u7e1b\u5272\u5f53\u3092\u3059\u308b\u4ee5\u4e0a\u306e\u5f37\u529b\u306a\u50cd\u304d\u3092\u3059\u308b\u3068\u8ff0\u3079\u305f\u3053\u3068\u3092\u899a\u3048\u3066\u3044\u307e\u3059\u304b\uff1f \u3053\u308c\u304c\u305d\u308c\u3067\u3059\u3002let\u306e\u5de6\u8fba\u306b\u306f\u30d1\u30bf\u30fc\u30f3\u3092\u304a\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3082\u3057\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u304c\u53f3\u8fba\u306b\u30de\u30c3\u30c1\u3059\u308b\u3068\u3001\u8907\u6570\u306e\u675f\u7e1b\u3092\u4e00\u5ea6\u306b\u5272\u5f53\u3066\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3060\u3068\u3001let\u306f\u30bf\u30d7\u30eb\u3092\u300c\u69cb\u9020\u5206\u89e3 destructure\u300d\u306a\u3044\u3057\u300c\u89e3\u4f53 break up\u300d\u3057\u3066\u3001\u305d\u306e\u7834\u7247\u30923\u3064\u306e\u675f\u7e1b\u306b\u5272\u5f53\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u306d\u3002<\/p>\n
\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3068\u3044\u3046\u3084\u3064\u306f\u975e\u5e38\u306b\u5f37\u529b\u3067\u3001\u5f8c\u306b\u3082\u3063\u3068\u7e70\u308a\u8fd4\u3057\u3066\u51fa\u3066\u304d\u307e\u3059\u3002<\/p>\n
\u30bf\u30d7\u30eb\u306b\u3064\u3044\u3066\u8a00\u3063\u3066\u304a\u304f\u3079\u304d\u6700\u5f8c\u306e\u70b9\u306f\u3001\u30bf\u30d7\u30eb\u304c\u7b49\u3057\u3044\u306e\u306f\u3001\u305d\u306e\u30a2\u30ea\u30c6\u30a3\uff08\u9805\u6570\uff09\u3001\u578b\u3001\u5024\u3001\u306e\u5168\u3066\u304c\u7b49\u3057\u3044\u6642\u306b\u9650\u3089\u308c\u308b\u3001\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n
let<\/span> x<\/span> =<\/span> (<\/span>1<\/span>i<\/span>,<\/span> 2<\/span>i<\/span>,<\/span> 3<\/span>i<\/span>);<\/span>\r\nlet<\/span> y<\/span> =<\/span> (<\/span>2<\/span>i<\/span>,<\/span> 3<\/span>i<\/span>,<\/span> 4<\/span>i<\/span>);<\/span>\r\n\r\nif<\/span> x<\/span> ==<\/span> y<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"yes\"<\/span>);<\/span>\r\n}<\/span> else<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"no\"<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5024\u304c\u7b49\u3057\u304f\u306a\u3044\u306e\u3067\u3001\u3053\u306e\u30b3\u30fc\u30c9\u306fno\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n
\u30bf\u30d7\u30eb\u306e\u3082\u3046\u3072\u3068\u3064\u5225\u306e\u4f7f\u3044\u65b9\u306f\u3001\u51fd\u6570\u304b\u3089\u8907\u6570\u306e\u5024\u3092\u8fd4\u3059\u3068\u304d\u306b\u4f7f\u3046\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002<\/p>\n
fn<\/span> next_two<\/span>(<\/span>x<\/span>:<\/span> int<\/span>)<\/span> -><\/span> (<\/span>int<\/span>,<\/span> int<\/span>)<\/span> {<\/span> (<\/span>x<\/span> +<\/span> 1<\/span>i<\/span>,<\/span> x<\/span> +<\/span> 2<\/span>i<\/span>)<\/span> }<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> (<\/span>x<\/span>,<\/span> y<\/span>)<\/span> =<\/span> next_two<\/span>(<\/span>5<\/span>i<\/span>);<\/span>\r\n    println!<\/span>(<\/span>\"x, y = {}, {}\"<\/span>,<\/span> x<\/span>,<\/span> y<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Rust\u306e\u51fd\u6570\u306f\u3072\u3068\u3064\u306e\u5024\u3057\u304b\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u306e\u3067\u3059\u304c\u3001\u30bf\u30d7\u30eb\u306f\u305f\u307e\u305f\u307e2\u3064\u306e\u5024\u304b\u3089\u51fa\u6765\u4e0a\u304c\u3063\u3066\u3044\u308b\u3060\u3051\u3067\u5024\u3068\u3057\u3066\u306f\u3072\u3068\u3064\u306e\u5024\u3067\u3059\u3002\u307e\u305f\u3001\u3053\u306e\u4f8b\u3092\u898b\u308b\u3068\u3001\u51fd\u6570\u304c\u8fd4\u3057\u3066\u304d\u305f\u30d1\u30bf\u30fc\u30f3\u3092\u3069\u306e\u3088\u3046\u306b\u5206\u89e3\u3059\u308c\u3070\u3044\u3044\u304b\u3082\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n
\u30bf\u30d7\u30eb\u306f\u975e\u5e38\u306b\u5358\u7d14\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3001\u3042\u306a\u305f\u304c\u6b32\u3057\u3044\u30c7\u30fc\u30bf\u69cb\u9020\u3060\u3068\u3044\u3046\u3053\u3068\u306f\u305d\u3053\u307e\u3067\u591a\u304f\u3042\u308a\u307e\u305b\u3093\u3002\u7d9a\u3051\u3066\u3001\u30bf\u30d7\u30eb\u306e\u5144\u8cb4\u5206\u3067\u3042\u308b\u69cb\u9020\u4f53(structs)\u306b\u884c\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
8.2. \u69cb\u9020\u4f53<\/h2>\n
\u69cb\u9020\u4f53\u306f\u3001\u30bf\u30d7\u30eb\u3068\u540c\u69d8\u306b\u3001\u300c\u30ec\u30b3\u30fc\u30c9\u578b\u300d\u306e\u3082\u3046\u3072\u3068\u3064\u5225\u306e\u5f62\u614b\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u6b21\u306e\u3088\u3046\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002\u69cb\u9020\u4f53\u306f\u305d\u308c\u304c\u542b\u3080\u5404\u8981\u7d20\u306b\u540d\u524d\u3092\u4e0e\u3048\u307e\u3059\u3002\u3053\u308c\u306f\u300c\u30d5\u30a3\u30fc\u30eb\u30c9\u300d\u3068\u304b\u300c\u30e1\u30f3\u30d0\u30fc\u300d\u3068\u547c\u3070\u308c\u307e\u3059\u3002\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
struct<\/span> Point<\/span> {<\/span>\r\n    x<\/span>:<\/span> int<\/span>,<\/span>\r\n    y<\/span>:<\/span> int<\/span>,<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> origin<\/span> =<\/span> Point<\/span> {<\/span> x<\/span>:<\/span> 0<\/span>i<\/span>,<\/span> y<\/span>:<\/span>  0<\/span>i<\/span> };<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The origin is at ({}, {})\"<\/span>,<\/span> origin<\/span>.x<\/span>,<\/span> origin<\/span>.y<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u305f\u304f\u3055\u3093\u306e\u3053\u3068\u304c\u7d9a\u3051\u3066\u884c\u308f\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u5206\u89e3\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u307e\u305a\u3001struct\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u69cb\u9020\u4f53\u3092\u5ba3\u8a00\u3057\u3001\u305d\u308c\u306b\u69cb\u9020\u4f53\u306e\u540d\u524d\u304c\u7d9a\u304d\u307e\u3059\u3002\u547d\u540d\u898f\u7d04\u306b\u3088\u3063\u3066\u3001\u69cb\u9020\u4f53\u306e\u540d\u524d\u306f\u5927\u6587\u5b57\u3067\u59cb\u307e\u308a\u3001\u30ad\u30e3\u30e1\u30eb\u30b1\u30fc\u30b9\u3067\u66f8\u304b\u308c\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001Point_In_Space\u3067\u306f\u306a\u304fPointInSpace\u3068\u66f8\u304d\u307e\u3059\u3002<\/p>\n
let\u306b\u3088\u3063\u3066\u3053\u306e\u69cb\u9020\u4f53\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u306e\u306f\u3044\u3064\u3082\u901a\u308a\u3067\u3059\u304c\u3001key: value\u3068\u3044\u3046\u5f62\u5f0f\u306e\u69cb\u6587\u3092\u4f7f\u3063\u3066\u3001\u5404\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u5024\u3092\u30bb\u30c3\u30c8\u3057\u307e\u3059\u3002\u9806\u756a\u306f\u5143\u3005\u306e\u69cb\u9020\u4f53\u306e\u5ba3\u8a00\u3068\u540c\u3058\u3067\u306a\u304f\u3066\u3082\u69cb\u3044\u307e\u305b\u3093\u3002<\/p>\n
\u6700\u5f8c\u306b\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u306f\u540d\u524d\u304c\u3042\u308a\u307e\u3059\u304b\u3089\u3001\u30c9\u30c3\u30c8\u8a18\u6cd5\u3067\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001origin.x\u3067\u3059\u3002<\/p>\n
\u69cb\u9020\u4f53\u306e\u4e2d\u306e\u5024\u306f\u3001Rust\u3067\u306e\u4ed6\u306e\u675f\u7e1b\u3068\u540c\u69d8\u306b\u3001\u5909\u66f4\u4e0d\u80fd\u3067\u3059\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001mut\u3092\u4f7f\u3048\u3070\u5909\u66f4\u53ef\u80fd\u306b\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\uff1a<\/p>\n
struct<\/span> Point<\/span> {<\/span>\r\n    x<\/span>:<\/span> int<\/span>,<\/span>\r\n    y<\/span>:<\/span> int<\/span>,<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> point<\/span> =<\/span> Point<\/span> {<\/span> x<\/span>:<\/span> 0<\/span>i<\/span>,<\/span> y<\/span>:<\/span>  0<\/span>i<\/span> };<\/span>\r\n\r\n    point<\/span>.x<\/span> =<\/span> 5<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The point is at ({}, {})\"<\/span>,<\/span> point<\/span>.x<\/span>,<\/span> point<\/span>.y<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u306fThe point is at (5, 0)\u3068\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n
8.3. \u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u3068Newtype<\/h2>\n
Rust\u306b\u306f\u3082\u3046\u3072\u3068\u3064\u3001\u30bf\u30d7\u30eb\u3068\u69cb\u9020\u4f53\u306e\u9593\u306e\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u306e\u3088\u3046\u306a\u30c7\u30fc\u30bf\u578b\u304c\u3042\u308a\u307e\u3059\u3002\u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u306b\u306f\u540d\u524d\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u306f\u540d\u524d\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
struct<\/span> Color<\/span>(<\/span>int<\/span>,<\/span> int<\/span>,<\/span> int<\/span>);<\/span>\r\nstruct<\/span> Point<\/span>(<\/span>int<\/span>,<\/span> int<\/span>,<\/span> int<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u4e21\u8005\u306f\u3001\u305f\u3068\u3048\u540c\u3058\u5024\u3092\u6301\u3063\u3066\u3044\u308b\u5834\u5408\u3067\u3082\u3001\u7b49\u3057\u304f\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n
let black  = Color(0, 0, 0);\r\nlet origin = Point(0, 0, 0);\r\n<\/code><\/pre>\n
\u6b86\u3069\u306e\u5834\u5408\u3001\u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u3067\u306f\u306a\u304f\u69cb\u9020\u4f53\u3092\u4f7f\u3046\u307b\u3046\u304c\u3088\u3044\u3067\u3057\u3087\u3046\u3002Color\u3068Point\u306f\u4ee3\u3048\u3066\u6b21\u306e\u3088\u3046\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
struct<\/span> Color<\/span> {<\/span>\r\n    red<\/span>:<\/span> int<\/span>,<\/span>\r\n    blue<\/span>:<\/span> int<\/span>,<\/span>\r\n    green<\/span>:<\/span> int<\/span>,<\/span>\r\n}<\/span>\r\n\r\nstruct<\/span> Point<\/span> {<\/span>\r\n    x<\/span>:<\/span> int<\/span>,<\/span>\r\n    y<\/span>:<\/span> int<\/span>,<\/span>\r\n    z<\/span>:<\/span> int<\/span>,<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u3046\u3059\u308b\u3068\u3001\u30bf\u30d7\u30eb\u306e\u4e2d\u306e\u4f4d\u7f6e\u3067\u306f\u306a\u304f\u3066\u3001\u304d\u3061\u3093\u3068\u540d\u524d\u304c\u4f7f\u3048\u307e\u3059\u3002\u826f\u3044\u540d\u524d\u3068\u3044\u3046\u3082\u306e\u306f\u91cd\u8981\u3067\u3042\u308a\u3001\u69cb\u9020\u4f53\u3067\u3042\u308c\u3070\u304d\u3061\u3093\u3068\u540d\u524d\u304c\u4ed8\u3051\u3089\u308c\u308b\u306e\u3067\u3059\u3002<\/p>\n
\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u304c\u3068\u3066\u3082\u5f79\u306b\u7acb\u3064\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u306f\u3001\u8981\u7d20\u304c\u3072\u3068\u3064\u3057\u304b\u306a\u3044\u30bf\u30d7\u30eb\u69cb\u9020\u4f53\u3067\u3059\u3002\u3053\u308c\u306f\u300cnewtype\u300d\u3068\u547c\u3070\u308c\u307e\u3059\u3002\u3068\u3044\u3046\u306e\u3082\u3001\u3042\u308b\u578b\u306b\u3064\u3044\u3066\u540c\u7fa9\u306a\u5225\u540d\u3067\u3042\u308b\u65b0\u305f\u306a\u578b\u3092\u4f5c\u3089\u305b\u3066\u304f\u308c\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n
struct Inches(int);\r\n\r\nlet length = Inches(10);\r\n\r\nlet Inches(integer_length) = length;\r\nprintln!(\"length is {} inches\", integer_length);\r\n<\/code><\/pre>\n
\u898b\u3066\u306e\u901a\u308a\u3001\u5185\u90e8\u306e\u6574\u6570\u578b\u306f\u69cb\u9020\u5206\u89e3\u306elet\u3067\u53d6\u308a\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
8.4. \u5217\u6319\u4f53<\/h2>\n
\u6700\u5f8c\u306b\u3001Rust\u306b\u306f\u300c\u76f4\u548c\u578b sum type\u300d\u3067\u3042\u308b \u5217\u6319\u4f53 enum \u304c\u3042\u308a\u307e\u3059\u3002\u5217\u6319\u4f53\u306f\u4fe1\u3058\u3089\u308c\u306a\u3044\u304f\u3089\u3044\u6709\u7528\u306aRust\u306e\u6a5f\u80fd\u3067\u3001\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u3044\u305f\u308b\u3068\u3053\u308d\u3067\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u4f8b\u306f\u3001Rust\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u3082\u306e\u3067\u3059\uff1a<\/p>\n
enum<\/span> Ordering<\/span> {<\/span>\r\n    Less<\/span>,<\/span>\r\n    Equal<\/span>,<\/span>\r\n    Greater<\/span>,<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Ordering\u578b\u306e\u5024\u306f\u3001Less, Equal, Greater\u306e\u3044\u305a\u308c\u304b\u3072\u3068\u3064\u306b\u3057\u304b\u306a\u308c\u307e\u305b\u3093\u3002\u6b21\u306e\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
fn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> int<\/span>,<\/span> b<\/span>:<\/span> int<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n    let<\/span> y<\/span> =<\/span> 10<\/span>i<\/span>;<\/span>\r\n\r\n    let<\/span> ordering<\/span> =<\/span> cmp<\/span>(<\/span>x<\/span>,<\/span> y<\/span>);<\/span>\r\n\r\n    if<\/span> ordering<\/span> ==<\/span> Less<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"less\"<\/span>);<\/span>\r\n    }<\/span> else<\/span> if<\/span> ordering<\/span> ==<\/span> Greater<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"greater\"<\/span>);<\/span>\r\n    }<\/span> else<\/span> if<\/span> ordering<\/span> ==<\/span> Equal<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"equal\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
cmp\u306f2\u3064\u306e\u3082\u306e\u3092\u6bd4\u8f03\u3057\u3066Ordering\u3092\u8fd4\u3059\u51fd\u6570\u3067\u3059\u30022\u3064\u306e\u5024\u304c\u3001\u3088\u308a\u5927\u304d\u3044\u304b\u3001\u3088\u308a\u5c0f\u3055\u3044\u304b\u3001\u305d\u308c\u3068\u3082\u7b49\u3057\u3044\u304b\u306b\u5fdc\u3058\u3066\u3001Less\u304bGreater\u304bEqual\u304b\u306e\u3044\u305a\u308c\u304b\u3092\u8fd4\u3059\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u5909\u6570ordering\u306fOrdering\u3068\u3044\u3046\u578b\u3092\u6301\u3063\u3066\u304a\u308a\u3001\u305d\u308c\u3086\u30483\u3064\u306e\u5024\u306e\u3044\u305a\u308c\u304b\u3092\u4fdd\u6301\u3057\u3066\u3044\u307e\u3059\u3002\u3067\u3059\u304b\u3089\u3001\u4e00\u9023\u306eif\/else\u306b\u3088\u308b\u6bd4\u8f03\u3067\u3001\u305d\u308c\u304c\u3069\u306e\u5024\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3057\u304b\u3057\u306a\u304c\u3089\u3001if\/else\u3092\u7e70\u308a\u8fd4\u3057\u3066\u6bd4\u8f03\u3092\u884c\u3046\u306e\u306f\u3054\u304f\u7169\u96d1\u306b\u306a\u308a\u307e\u3059\u3002Rust\u306b\u306f\u3001\u3053\u308c\u3092\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u5834\u5408\u5206\u3051\u3092\u6f0f\u3089\u3055\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u3066\u304f\u308c\u308b\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u305d\u308c\u306b\u884c\u304f\u524d\u306b\u3001\u66f4\u306b\u3082\u3046\u4e00\u7a2e\u985e\u306e\u5217\u6319\u4f53\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u4eca\u5ea6\u306f\u5024\u3092\u4f34\u3063\u305f\u5217\u6319\u4f53\u3067\u3059\uff1a<\/p>\n
\u3053\u306e\u5217\u6319\u4f53\u306b\u306f2\u3064\u306e\u30f4\u30a1\u30ea\u30a2\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u4e00\u65b9\u304c\u5024\u3092\u6301\u3063\u3066\u3044\u307e\u3059\uff1a<\/p>\n
enum<\/span> OptionalInt<\/span> {<\/span>\r\n    Value<\/span>(<\/span>int<\/span>),<\/span>\r\n    Missing<\/span>,<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> Value<\/span>(<\/span>5<\/span>);<\/span>\r\n    let<\/span> y<\/span> =<\/span> Missing<\/span>;<\/span>\r\n\r\n    match<\/span> x<\/span> {<\/span>\r\n        Value<\/span>(<\/span>n<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"x is {:d}\"<\/span>,<\/span> n<\/span>),<\/span>\r\n        Missing<\/span>  =><\/span> println!<\/span>(<\/span>\"x is missing!\"<\/span>),<\/span>\r\n    }<\/span>\r\n\r\n    match<\/span> y<\/span> {<\/span>\r\n        Value<\/span>(<\/span>n<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"y is {:d}\"<\/span>,<\/span> n<\/span>),<\/span>\r\n        Missing<\/span>  =><\/span> println!<\/span>(<\/span>\"y is missing!\"<\/span>),<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u5217\u6319\u4f53\u306f\u3001\u3042\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3057\u306a\u3044\u304b\u3082\u3057\u308c\u306a\u3044int\u3068\u3044\u3046\u3082\u306e\u3092\u8868\u73fe\u3057\u3066\u3044\u307e\u3059\u3002\u898b\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u3001\u3064\u307e\u308a\u3001Missing\u306e\u5834\u5408\u306b\u306f\u5024\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001Value\u306e\u5834\u5408\u306b\u306f\u3001\u5024\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u3053\u306e\u5217\u6319\u4f53\u306fint\u306b\u7279\u5b9a\u3055\u308c\u3066\u3057\u307e\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3092\u3001\u3069\u3093\u306a\u578b\u3067\u3082\u4f7f\u3048\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u306f\u307e\u3060\u5148\u306e\u8a71\u3067\u3059\uff01<\/p>\n
\u5217\u6319\u4f53\u306e\u4e2d\u306b\u306f\u4efb\u610f\u306e\u6570\u306e\u5024\u3092\u5165\u308c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
enum<\/span> OptionalColor<\/span> {<\/span>\r\n    Color<\/span>(<\/span>int<\/span>,<\/span> int<\/span>,<\/span> int<\/span>),<\/span>\r\n    Missing<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5024\u3092\u4f34\u3063\u305f\u5217\u6319\u4f53\u306f\u3068\u3066\u3082\u6709\u7528\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u65e2\u306b\u89e6\u308c\u305f\u3088\u3046\u306b\u3001\u7570\u306a\u3063\u305f\u578b\u3092\u6e21\u308b\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u306a\u3082\u306e\u3067\u3042\u308b\u3068\u304d\u306b\u3001\u66f4\u306b\u3044\u3063\u305d\u3046\u6709\u7528\u306b\u306a\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u306b\u884c\u304f\u524d\u306b\u3001\u307e\u305a\u306f\u3001\u3053\u308c\u307e\u3067\u66f8\u3044\u3066\u304d\u305f\u3053\u306e\u5de8\u5927\u306aif\/else\u6587\u3092\u3069\u3046\u3084\u3063\u3066\u624b\u76f4\u3057\u3059\u308b\u304b\u306b\u3064\u3044\u3066\u304a\u8a71\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u308c\u306fmatch\u3092\u4f7f\u3063\u3066\u884c\u3046\u306e\u3067\u3059\u3002<\/p>\n
9. Match<\/h1>\n
\u5358\u7d14\u306aif\/else\u3067\u306f\u5145\u5206\u3067\u306a\u3044\u3053\u3068\u304c\u3057\u3070\u3057\u3070\u3042\u308a\u307e\u3059\u3002\u3068\u3044\u3046\u306e\u3082\u3001\u53ef\u80fd\u306a\u30aa\u30d7\u30b7\u30e7\u30f3\u304c2\u3064\u306e\u3068\u3069\u307e\u3089\u306a\u3044\u3053\u3068\u304c\u3057\u3070\u3057\u3070\u3042\u308b\u304b\u3089\u3067\u3059\u3002else\u90e8\u5206\u306e\u6761\u4ef6\u304c\u4fe1\u3058\u3089\u308c\u306a\u3044\u7a0b\u8fbc\u307f\u5165\u3063\u305f\u3082\u306e\u306b\u306a\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u3067\u306f\u3001\u3069\u3046\u3044\u3046\u89e3\u6c7a\u7b56\u304c\u3042\u308b\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
Rust\u306b\u306fmatch\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u3042\u308a\u3001\u3053\u308c\u306f\u3053\u3093\u304c\u3089\u304c\u3063\u305fif\/else\u306e\u307e\u3068\u307e\u308a\u3092\u3001\u3088\u308a\u5f37\u529b\u306a\u3082\u306e\u3067\u7f6e\u304d\u63db\u3048\u3055\u305b\u3066\u304f\u308c\u308b\u306e\u3067\u3059\u3002\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n\r\nmatch<\/span> x<\/span> {<\/span>\r\n    1<\/span> =><\/span> println!<\/span>(<\/span>\"one\"<\/span>),<\/span>\r\n    2<\/span> =><\/span> println!<\/span>(<\/span>\"two\"<\/span>),<\/span>\r\n    3<\/span> =><\/span> println!<\/span>(<\/span>\"three\"<\/span>),<\/span>\r\n    4<\/span> =><\/span> println!<\/span>(<\/span>\"four\"<\/span>),<\/span>\r\n    5<\/span> =><\/span> println!<\/span>(<\/span>\"five\"<\/span>),<\/span>\r\n    _<\/span> =><\/span> println!<\/span>(<\/span>\"something else\"<\/span>),<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
match\u306f\u5f0f\u3092\u53d6\u308a\u3001\u305d\u306e\u5024\u306b\u57fa\u3065\u3044\u3066\u5206\u5c90\u3057\u307e\u3059\u3002\u5206\u5c90\u306e\u305d\u308c\u305e\u308c\u306e\u300c\u80a2\u300d\u306f\u3001val => explession\u3068\u3044\u3046\u5f62\u3092\u53d6\u308a\u307e\u3059\u3002\u3082\u3057\u5024\u304c\u30de\u30c3\u30c1\u3059\u308b\u3068\u3001\u305d\u306e\u80a2\u306e\u5f0f\u304c\u8a55\u4fa1\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306bmatch\u3068\u3044\u3046\u540d\u524d\u304c\u3064\u3044\u3066\u3044\u308b\u306e\u306f\u3001\u300c\u30d1\u30bf\u30fc\u30f3\u30fb\u30de\u30c3\u30c1\u30f3\u30b0\u300d\u3068\u3044\u3046\u7528\u8a9e\u306b\u3088\u308b\u3082\u306e\u3067\u3001match\u306f\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u30fb\u30de\u30c3\u30c1\u30f3\u30b0\u306e\u5b9f\u88c5\u306a\u306e\u3067\u3059\u3002<\/p>\n
\u3067\u3001\u3053\u308c\u306e\u306a\u306b\u304c\u305d\u3093\u306a\u306b\u5927\u304d\u306a\u5229\u70b9\u3060\u3068\u3044\u3046\u306e\u3067\u3057\u3087\u3046\u304b\uff1f \u3088\u308d\u3057\u3044\u3001\u5e7e\u3064\u304b\u3042\u308a\u307e\u3059\u3002\u306a\u306b\u3088\u308a\u3082\u307e\u305a\u3001match\u306f\u7db2\u7f85\u7684\u30c1\u30a7\u30c3\u30af\u3092\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u6700\u5f8c\u306b\u3042\u308b\u3001\u30a2\u30f3\u30c0\u30fc\u30b9\u30b3\u30a2(_)\u306e\u3064\u3044\u305f\u80a2\u304c\u898b\u3048\u307e\u3059\u304b\uff1f \u3082\u3057\u3053\u308c\u3092\u53d6\u308a\u9664\u3044\u3066\u3057\u307e\u3046\u3068\u3001Rust\u306f\u6b21\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u3092\u8868\u793a\u3057\u307e\u3059\uff1a<\/p>\n
error: non-exhaustive patterns: `_` not covered\r\n<\/span><\/code><\/pre>\n
\u8a00\u3044\u63db\u3048\u308b\u3068\u3001Rust\u304c\u8a00\u304a\u3046\u3068\u3057\u3066\u3044\u308b\u306e\u306f\u3001\u6211\u3005\u304c\u3042\u308b\u5024\u3092\u5931\u5ff5\u3057\u305f\u306e\u3067\u306f\u306a\u3044\u304b\u3001\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002x\u306f\u6574\u6570\u3067\u3059\u304b\u3089\u3001Rust\u306f\u305d\u308c\u304c\u6570\u591a\u3042\u308b\u69d8\u3005\u306a\u5024\u3092\u53d6\u308a\u3046\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u77e5\u3063\u3066\u3044\u307e\u3059\u3002\u305f\u3068\u3048\u30706i\u3067\u3059\u3002\u3057\u304b\u3057\u3001_\u304c\u306a\u3051\u308c\u3070\u3001\u305d\u308c\u306b\u30de\u30c3\u30c1\u3059\u308b\u80a2\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u3060\u304b\u3089\u3001Rust\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3092\u62d2\u7d76\u3059\u308b\u306e\u3067\u3059\u3002_\u306f\u300c\u306a\u3093\u3067\u3082\u3054\u3056\u308c\u300d\u306e\u3088\u3046\u306a\u80a2\u3067\u3059\u3002\u3082\u3057\u4ed6\u306e\u3069\u306e\u80a2\u3082\u30de\u30c3\u30c1\u3057\u306a\u3044\u3068\u3001_\u306e\u80a2\u304c\u30de\u30c3\u30c1\u3057\u307e\u3059\u3002\u3053\u306e\u300c\u306a\u3093\u3067\u3082\u3054\u3056\u308c\u300d\u306a\u80a2\u304c\u3042\u308b\u306e\u3067\u3001x\u304c\u53d6\u308a\u3046\u308b\u3069\u3093\u306a\u5024\u306b\u5bfe\u3057\u3066\u3082\u80a2\u304c\u3042\u308b\u3053\u3068\u306b\u306a\u308a\u3001\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n
match\u6587\u306f\u3001\u307e\u305f\u5217\u6319\u4f53\u306e\u69cb\u9020\u5206\u89e3\u3082\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u5217\u6319\u4f53\u306e\u7bc0\u3067\u51fa\u3066\u304d\u305f\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u899a\u3048\u3066\u3044\u307e\u3059\u304b\uff1f<\/p>\n
fn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> int<\/span>,<\/span> b<\/span>:<\/span> int<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n    let<\/span> y<\/span> =<\/span> 10<\/span>i<\/span>;<\/span>\r\n\r\n    let<\/span> ordering<\/span> =<\/span> cmp<\/span>(<\/span>x<\/span>,<\/span> y<\/span>);<\/span>\r\n\r\n    if<\/span> ordering<\/span> ==<\/span> Less<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"less\"<\/span>);<\/span>\r\n    }<\/span> else<\/span> if<\/span> ordering<\/span> ==<\/span> Greater<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"greater\"<\/span>);<\/span>\r\n    }<\/span> else<\/span> if<\/span> ordering<\/span> ==<\/span> Equal<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"equal\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u306fmatch\u3068\u3057\u3066\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
fn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> int<\/span>,<\/span> b<\/span>:<\/span> int<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n    let<\/span> y<\/span> =<\/span> 10<\/span>i<\/span>;<\/span>\r\n\r\n    match<\/span> cmp<\/span>(<\/span>x<\/span>,<\/span> y<\/span>)<\/span> {<\/span>\r\n        Less<\/span>    =><\/span> println!<\/span>(<\/span>\"less\"<\/span>),<\/span>\r\n        Greater<\/span> =><\/span> println!<\/span>(<\/span>\"greater\"<\/span>),<\/span>\r\n        Equal<\/span>   =><\/span> println!<\/span>(<\/span>\"equal\"<\/span>),<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u30f4\u30a1\u30fc\u30b8\u30e7\u30f3\u306f\u30ce\u30a4\u30ba\u304c\u5927\u5909\u306b\u5c11\u306a\u304f\u306a\u3063\u3066\u304a\u308a\u3001Ordering\u306e\u53ef\u80fd\u306a\u30f4\u30a1\u30ea\u30a2\u30f3\u30c8\u306e\u5168\u3066\u3092\u30ab\u30d0\u30fc\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u5b9f\u306b\u3059\u308b\u305f\u3081\u306b\u3001\u7db2\u7f85\u7684\u30c1\u30a7\u30c3\u30af\u3092\u3057\u3066\u304f\u308c\u307e\u3059\u3002if\/else\u306e\u30f4\u30a1\u30fc\u30b8\u30e7\u30f3\u3067\u306f\u3001\u4f8b\u3048\u3070\u3082\u3057Greater\u306e\u5834\u5408\u3092\u5fd8\u308c\u305f\u6642\u306b\u3082\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u559c\u3093\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u305f\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u4ed6\u65b9\u3067\u3001match\u3067Greater\u3092\u5fd8\u308c\u305f\u5834\u5408\u306b\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u307e\u305b\u3093\u3002Rust\u306f\u5206\u5c90\u306e\u5168\u3066\u306e\u30d9\u30fc\u30b9\u3092\u78ba\u5b9f\u306b\u30ab\u30d0\u30fc\u3059\u308b\u624b\u52a9\u3051\u3092\u3057\u3066\u304f\u308c\u308b\u306e\u3067\u3059\u3002<\/p>\n
\u307e\u305f\u3001match\u306f\u5f0f\u3067\u3059\u304b\u3089\u3001let\u675f\u7e1b\u306e\u53f3\u8fba\u3067\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5148\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
fn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> int<\/span>,<\/span> b<\/span>:<\/span> int<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 5<\/span>i<\/span>;<\/span>\r\n    let<\/span> y<\/span> =<\/span> 10<\/span>i<\/span>;<\/span>\r\n\r\n    let<\/span> result<\/span> =<\/span> match<\/span> cmp<\/span>(<\/span>x<\/span>,<\/span> y<\/span>)<\/span> {<\/span>\r\n        Less<\/span>    =><\/span> \"less\"<\/span>,<\/span>\r\n        Greater<\/span> =><\/span> \"greater\"<\/span>,<\/span>\r\n        Equal<\/span>   =><\/span> \"equal\"<\/span>,<\/span>\r\n    };<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> result<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u5834\u5408\u306b\u306f\u3001\u4f5c\u308b\u5fc5\u8981\u304c\u306a\u3044\u3068\u3053\u308d\u3067\u308f\u3056\u308f\u3056\u4e00\u6642\u7684\u306a\u6587\u5b57\u5217\u3092\u4f5c\u3063\u3066\u3044\u308b\u3060\u3051\u306a\u306e\u3067\u3001\u5927\u3057\u305f\u610f\u5473\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u3057\u304b\u3057\u3053\u308c\u304c\u3088\u3044\u30d1\u30bf\u30fc\u30f3\u3067\u3042\u308b\u3053\u3068\u304c\u3057\u3070\u3057\u3070\u3042\u308a\u307e\u3059\u3002<\/p>\n
10. \u7e70\u308a\u8fd4\u3057<\/h1>\n
\u30eb\u30fc\u30d7\u306f\u3001\u307e\u3060\u79c1\u9054\u304c\u5b66\u3093\u3067\u3044\u306a\u3044\u3001Rust\u306b\u65bc\u3051\u308b\u6700\u5f8c\u306e\u57fa\u672c\u69cb\u9020\u3067\u3059\u3002Rust\u306b\u306f\u3001for\u3068while\u3068\u3044\u30462\u3064\u306e\u4e3b\u8981\u306a\u30eb\u30fc\u30d7\u69cb\u9020\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
10.1 for<\/h2>\n
for\u30eb\u30fc\u30d7\u306f\u3001\u3042\u308b\u7279\u5b9a\u56de\u6570\u306e\u30eb\u30fc\u30d7\u3092\u3059\u308b\u305f\u3081\u306b\u7528\u3044\u3089\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001Rust\u306efor\u30eb\u30fc\u30d7\u306f\u3001\u4ed6\u306e\u30b7\u30b9\u30c6\u30e0\u8a00\u8a9e\u3068\u306f\u4e9b\u304b\u3053\u3068\u306a\u3063\u305f\u52d5\u4f5c\u3092\u3057\u307e\u3059\u3002Rust\u306efor\u30eb\u30fc\u30d7\u306f\u6b21\u306e\u3088\u3046\u306a\u300cC\u8a00\u8a9e\u30b9\u30bf\u30a4\u30eb\u300d\u306efor\u30eb\u30fc\u30d7\u3068\u306f\u3001\u9055\u3063\u305f\u898b\u305f\u76ee\u3092\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\r\nfor<\/span> (<\/span>x<\/span> =<\/span> 0<\/span>;<\/span> x<\/span> <<\/span> 10<\/span>;<\/span> x<\/span>++<\/span>)<\/span> {<\/span>\r\n    printf<\/span>(<\/span> \"%d<\/span>\\n<\/span>\"<\/span>,<\/span> x<\/span> );<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Rust\u3067\u306f\u3001C\u3068\u306f\u9055\u3044\u3001\u3053\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n
for<\/span> x<\/span> in<\/span> range<\/span>(<\/span>0<\/span>i<\/span>,<\/span> 10<\/span>i<\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"{:d}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5c11\u3057\u3070\u304b\u308a\u62bd\u8c61\u7684\u306b\u8868\u73fe\u3059\u308b\u3068\uff1a<\/p>\n
for<\/span> var<\/span> in<\/span> expression<\/span> {<\/span>\r\n    code<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u5f0f\u306f \u30a4\u30c6\u30ec\u30fc\u30bf \u306b\u306a\u308b\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u306b\u3064\u3044\u3066\u306f\u3053\u306e\u30ac\u30a4\u30c9\u306e\u5f8c\u306e\u65b9\u3067\u3001\u8a73\u7d30\u306b\u8a71\u3057\u3092\u3057\u307e\u3059\u3002\u30a4\u30c6\u30ec\u30fc\u30bf\u306f\u3001\u3042\u308b\u3072\u3068\u9023\u306a\u308a\u306e\u8981\u7d20\u3092\u8fd4\u3057\u3066\u304d\u307e\u3059\u3002\u5404\u8981\u7d20\u304c\u30eb\u30fc\u30d7\u306e\u53cd\u5fa91\u56de\u5206\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u5024\u304cvar\u3068\u3044\u3046\u540d\u524d\u306b\u675f\u7e1b\u3055\u308c\u3001\u3053\u306e\u675f\u7e1b\u306f\u30eb\u30fc\u30d7\u306e\u672c\u4f53\u306b\u65bc\u3044\u3066\u6709\u52b9\u306b\u306a\u308a\u307e\u3059\u3002\u672c\u4f53\u304c1\u56de\u7d42\u308f\u308b\u3068\u3001\u6b21\u306e\u5024\u304c\u30a4\u30c6\u30ec\u30fc\u30bf\u304b\u3089\u53d6\u308a\u51fa\u3055\u308c\u3001\u3082\u3046\u3044\u3061\u3069\u30eb\u30fc\u30d7\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u5024\u304c\u305d\u308c\u4ee5\u4e0a\u306a\u304f\u306a\u308b\u3068\u3001for\u30eb\u30fc\u30d7\u306f\u7d42\u4e86\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001range\u304c\u3001\u958b\u59cb\u4f4d\u7f6e\u3068\u7d42\u4e86\u4f4d\u7f6e\u3092\u53d6\u308b\u51fd\u6570\u3067\u3001\u3053\u308c\u3089\u306e\u5024\u3092\u6e21\u308b\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u8fd4\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u4e0a\u754c\u306f\u9664\u5916\u7684\u306a\u306e\u3067\u3001\u3053\u306e\u30eb\u30fc\u30d7\u306f0\u304b\u30899\u307e\u3067\u3092\u8868\u793a\u3057\u307e\u3059\u304c\u300110\u306f\u8868\u793a\u3057\u307e\u305b\u3093\u3002<\/p>\n
Rust\u306bC\u8a00\u8a9e\u30b9\u30bf\u30a4\u30eb\u306efor\u30eb\u30fc\u30d7\u304c\u306a\u3044\u306e\u306f\u308f\u3056\u3068\u3067\u3059\u3002\u30eb\u30fc\u30d7\u306e\u5404\u8981\u7d20\u3092\u624b\u305a\u304b\u3089\u5236\u5fa1\u3059\u308b\u306e\u306f\u3001\u719f\u7df4\u306eC\u30d7\u30ed\u30b0\u30e9\u30de\u306b\u3068\u3063\u3066\u3059\u3089\u3001\u8907\u96d1\u3067\u3042\u308a\u3001\u30a8\u30e9\u30fc\u3092\u62db\u304d\u304c\u3061\u3067\u3059\u3002<\/p>\n
for\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u306e\u30ac\u30a4\u30c9\u306e\u5f8c\u306e\u65b9\u3067\u30a4\u30c6\u30ec\u30fc\u30bf\u306b\u89e6\u308c\u308b\u969b\u306b\u3082\u3063\u3068\u304a\u8a71\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
10.2. while<\/h2>\n
Rust\u306b\u65bc\u3051\u308b\u6b8b\u308a\u306e\u3082\u3046\u3072\u3068\u3064\u306e\u30eb\u30fc\u30d7\u69cb\u9020\u304c\u3001while\u30eb\u30fc\u30d7\u3067\u3059\u3002\u3053\u3093\u306a\u304b\u3093\u3058\u3067\u3059\uff1a<\/p>\n
let<\/span> mut<\/span> x<\/span> =<\/span> 5u<\/span>;<\/span>\r\nlet<\/span> mut<\/span> done<\/span> =<\/span> false<\/span>;<\/span>\r\n\r\nwhile<\/span> !<\/span>done<\/span> {<\/span>\r\n    x<\/span> +=<\/span> x<\/span> -<\/span> 3<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n    if<\/span> x<\/span> %<\/span> 5<\/span> ==<\/span> 0<\/span> {<\/span> done<\/span> =<\/span> true<\/span>;<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
while\u30eb\u30fc\u30d7\u306f\u4f55\u56de\u30eb\u30fc\u30d7\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u304c\u308f\u304b\u3089\u306a\u3044\u6642\u306b\u3001\u6b63\u3057\u3044\u9078\u629e\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u7121\u9650\u30eb\u30fc\u30d7\u304c\u5fc5\u8981\u306a\u3068\u304d\u306b\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u66f8\u3053\u3046\u3068\u3044\u3046\u6c17\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\uff1a<\/p>\n
while<\/span> true<\/span> {<\/span>\r\n<\/code><\/pre>\n
Rust\u306b\u306f\u3053\u306e\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3092\u6271\u3046\u305f\u3081\u306e\u5c02\u7528\u306e\u30ad\u30fc\u30ef\u30fc\u30c9loop\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n
loop<\/span> {<\/span>\r\n<\/code><\/pre>\n
Rust\u306e\u5236\u5fa1\u30d5\u30ed\u30fc\u5206\u6790\u306f\u3001\u3053\u306e\u69cb\u9020\u3092while true\u3068\u306f\u7570\u306a\u3063\u305f\u53d6\u308a\u6271\u3044\u3092\u3057\u307e\u3059\u3002\u3068\u3044\u3046\u306e\u3082\u3001\u305d\u308c\u304c\u5e38\u306b\u30eb\u30fc\u30d7\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002\u3053\u308c\u304c\u3069\u3046\u3044\u3046\u3053\u3068\u304b\u306e\u8a73\u7d30\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u3053\u306e\u6bb5\u968e\u3067\u306f\u305d\u308c\u307b\u3069\u91cd\u8981\u3068\u3044\u3046\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u4e00\u822c\u7684\u306b\u8a00\u3063\u3066\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u4e0e\u3048\u308b\u60c5\u5831\u304c\u591a\u3051\u308c\u3070\u591a\u3044\u307b\u3069\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u5b89\u5168\u6027\u3068\u30b3\u30fc\u30c9\u751f\u6210\u306b\u95a2\u3057\u3066\u3001\u3088\u308a\u4e0a\u624b\u304f\u632f\u308b\u821e\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3067\u3059\u304b\u3089\u3001\u7121\u9650\u306b\u30eb\u30fc\u30d7\u3057\u3088\u3046\u3068\u3044\u3046\u6642\u306b\u306f\u3001\u3044\u3064\u3067\u3082loop\u306e\u65b9\u3092\u4f7f\u3046\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
10.3. \u53cd\u5fa9\u3092\u65e9\u671f\u306b\u4e2d\u65ad\u3059\u308b<\/h2>\n
\u5148\u306ewhile\u30eb\u30fc\u30d7\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
let<\/span> mut<\/span> x<\/span> =<\/span> 5u<\/span>;<\/span>\r\nlet<\/span> mut<\/span> done<\/span> =<\/span> false<\/span>;<\/span>\r\n\r\nwhile<\/span> !<\/span>done<\/span> {<\/span>\r\n    x<\/span> +=<\/span> x<\/span> -<\/span> 3<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n    if<\/span> x<\/span> %<\/span> 5<\/span> ==<\/span> 0<\/span> {<\/span> done<\/span> =<\/span> true<\/span>;<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3044\u3064\u30eb\u30fc\u30d7\u304b\u3089\u629c\u3051\u51fa\u3059\u3079\u304d\u304b\u3092\u77e5\u308b\u305f\u3081\u306b\u3001done\u3068\u3044\u3046mut\u306a\u30d6\u30fc\u30eb\u578b\u306e\u5909\u6570\u675f\u7e1b\u3092\u305d\u308c\u5c02\u7528\u306b\u5f53\u3066\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3067\u3057\u305f\u3002Rust\u306b\u306f\u3001\u53cd\u5fa9\u3092\u8abf\u6574\u3059\u308b\u52a9\u3051\u306b\u306a\u308b2\u3064\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3001break\u3068continue\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u4f8b\u306e\u5834\u5408\u3001break\u3092\u4f7f\u3048\u3070\u3001\u30eb\u30fc\u30d7\u3092\u3082\u3063\u3068\u4e0a\u624b\u304f\u66f8\u3051\u307e\u3059\uff1a<\/p>\n
let<\/span> mut<\/span> x<\/span> =<\/span> 5u<\/span>;<\/span>\r\n\r\nloop<\/span> {<\/span>\r\n    x<\/span> +=<\/span> x<\/span> -<\/span> 3<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n    if<\/span> x<\/span> %<\/span> 5<\/span> ==<\/span> 0<\/span> {<\/span> break<\/span>;<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3067loop\u306b\u3088\u3063\u3066\u6c38\u9060\u306b\u30eb\u30fc\u30d7\u3059\u308b\u3053\u3068\u306b\u306a\u3063\u305f\u308f\u3051\u3067\u3059\u304c\u3001\u9014\u4e2d\u3067\u8131\u51fa\u3059\u308b\u305f\u3081\u306bbreak\u3092\u4f7f\u3046\u306e\u3067\u3059\u3002<\/p>\n
continue\u3082\u540c\u69d8\u3067\u3059\u304c\u3001\u3053\u308c\u306f\u30eb\u30fc\u30d7\u3092\u7d42\u308f\u3089\u305b\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u6b21\u306e\u56de\u306e\u53cd\u5fa9\u306b\u79fb\u884c\u3057\u307e\u3059\u3002\u6b21\u306e\u4f8b\u306f\u5947\u6570\u3060\u3051\u3092\u8868\u793a\u3057\u307e\u3059\uff1a<\/p>\n
for<\/span> x<\/span> in<\/span> range<\/span>(<\/span>0<\/span>i<\/span>,<\/span> 10<\/span>i<\/span>)<\/span> {<\/span>\r\n    if<\/span> x<\/span> %<\/span> 2<\/span> ==<\/span> 0<\/span> {<\/span> continue<\/span>;<\/span> }<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{:d}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
continue\u3068break\u306e\u4e21\u65b9\u3068\u3082\u3001for\u3068while\u306e\u3069\u3061\u3089\u306e\u7a2e\u985e\u306e\u30eb\u30fc\u30d7\u3067\u3082\u6709\u52b9\u3067\u3059\u3002<\/p>\n
11. \u6587\u5b57\u5217<\/h1>\n
\u6587\u5b57\u5217\u306f\u3001\u3069\u3093\u306a\u30d7\u30ed\u30b0\u30e9\u30de\u3082\u304c\u30de\u30b9\u30bf\u30fc\u3059\u3079\u304d\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3059\u3002Rust\u306e\u6587\u5b57\u5217\u53d6\u308a\u6271\u3044\u306e\u30b7\u30b9\u30c6\u30e0\u306f\u3001Rust\u304c\u30b7\u30b9\u30c6\u30e0\u306b\u7126\u70b9\u3092\u5f53\u3066\u3066\u3044\u308b\u305f\u3081\u306b\u3001\u4ed6\u306e\u8a00\u8a9e\u306e\u3082\u306e\u3068\u5c11\u3057\u3070\u304b\u308a\u7570\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u53ef\u5909\u30b5\u30a4\u30ba\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u6271\u3063\u3066\u3044\u308b\u3068\u304d\u306b\u306f\u3001\u4e8b\u614b\u306f\u8907\u96d1\u306b\u306a\u308a\u3046\u308b\u3082\u306e\u3067\u3001\u6587\u5b57\u5217\u306f\u307e\u3055\u306b\u30b5\u30a4\u30ba\u5909\u66f4\u53ef\u80fd\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306a\u306e\u3067\u3059\u3002\u305d\u308c\u306f\u305d\u308c\u3068\u3057\u3066\u3001\u307e\u305f\u3001Rust\u306e\u6587\u5b57\u5217\u306f\u3001C\u306e\u3088\u3046\u306a\u4ed6\u306e\u30b7\u30b9\u30c6\u30e0\u8a00\u8a9e\u3068\u3082\u9055\u3063\u305f\u52d5\u4f5c\u3092\u3057\u307e\u3059\u3002<\/p>\n
\u3067\u306f\u3001\u8a73\u7d30\u3092\u6398\u308a\u4e0b\u3052\u308b\u3053\u3068\u306b\u3057\u307e\u3057\u3087\u3046\u3002 \u6587\u5b57\u5217 \u306f\u3001UTF-8\u306e\u30d0\u30a4\u30c8\u30fb\u30b9\u30c8\u30ea\u30fc\u30e0\u3068\u3057\u3066\u30a8\u30f3\u30b3\u30fc\u30c9\u3055\u308c\u305f\u30e6\u30cb\u30b3\u30fc\u30c9\u6570\u5024\u306e\u30b7\u30fc\u30af\u30a8\u30f3\u30b9\u3067\u3059\u3002\u66f4\u306b\u4ed8\u3051\u52a0\u3048\u308b\u3068\u3001\u6587\u5b57\u5217\u306f\u30ca\u30eb\u7d42\u7aef\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u30ca\u30eb\u6587\u5b57\u3092\u542b\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
Rust\u306b\u306f&str\u3068String\u3068\u3044\u3046\u30012\u7a2e\u985e\u306e\u4e3b\u8981\u306a\u6587\u5b57\u5217\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u7b2c1\u306e\u3082\u306e\u306f\u3001&str\u3067\u3001\u3053\u308c\u306f\u300c\u6587\u5b57\u5217\u30b9\u30e9\u30a4\u30b9\u300d\u3068\u547c\u3070\u308c\u307e\u3059\u3002\u6587\u5b57\u5217\u30ea\u30c6\u30e9\u30eb\u306f\u3001&str\u578b\u3067\u3059\uff1a<\/p>\n
let<\/span> string<\/span> =<\/span> \"Hello there.\"<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u6587\u5b57\u5217\u306f\u9759\u7684\u306b\u5272\u5f53\u3055\u308c\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u305d\u308c\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5185\u90e8\u306b\u4fdd\u5b58\u3055\u308c\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u4e2d\u5168\u671f\u9593\u3092\u901a\u3058\u3066\u5b58\u5728\u3057\u307e\u3059\u3002\u4e0a\u306estring\u3068\u3044\u3046\u675f\u7e1b\u306f\u3001\u3053\u306e\u9759\u7684\u306b\u5272\u5f53\u3055\u308c\u305f\u6587\u5b57\u5217\u3078\u306e\u53c2\u7167\u3067\u3059\u3002\u6587\u5b57\u5217\u30b9\u30e9\u30a4\u30b9\u306f\u56fa\u5b9a\u30b5\u30a4\u30ba\u3092\u6301\u3061\u3001\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n
\u4ed6\u65b9\u3067\u3001String\u306f\u3001\u30a4\u30f3\u30e1\u30e2\u30ea\u306a\u6587\u5b57\u5217\u3067\u3059\u3002\u3053\u306e\u6587\u5b57\u5217\u306f\u4f38\u9577\u53ef\u80fd\u3067\u3001\u307e\u305f\u3001UTF-8\u3067\u3042\u308b\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
let<\/span> mut<\/span> s<\/span> =<\/span> \"Hello\"<\/span>.to_string<\/span>();<\/span>\r\nprintln!<\/span>(<\/span>\"{}\"<\/span>,<\/span> s<\/span>);<\/span>\r\n\r\ns<\/span>.push_str<\/span>(<\/span>\", world.\"<\/span>);<\/span>\r\nprintln!<\/span>(<\/span>\"{}\"<\/span>,<\/span> s<\/span>);<\/span>\r\n<\/code><\/pre>\n
as_slice()\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u3063\u3066\u3001String\u3092&str\u306b\u5f37\u5236\u578b\u5909\u63db\u3092\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
fn<\/span> takes_slice<\/span>(<\/span>slice<\/span>:<\/span> &<\/span>str<\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Got: {}\"<\/span>,<\/span> slice<\/span>);<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> s<\/span> =<\/span> \"Hello\"<\/span>.to_string<\/span>();<\/span>\r\n    takes_slice<\/span>(<\/span>s<\/span>.as_slice<\/span>());<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
String\u3092\u5b9a\u6570\u6587\u5b57\u5217\u3068\u6bd4\u8f03\u3059\u308b\u306b\u306f\u3001\u6b21\u306eto_string()\u3067\u306f\u306a\u304f\uff1a<\/p>\n
fn<\/span> compare<\/span>(<\/span>string<\/span>:<\/span> String<\/span>)<\/span> {<\/span>\r\n    if<\/span> string<\/span> ==<\/span> \"Hello\"<\/span>.to_string<\/span>()<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"yes\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
as_slice()\u3092\u7528\u3044\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
fn<\/span> compare<\/span>(<\/span>string<\/span>:<\/span> String<\/span>)<\/span> {<\/span>\r\n    if<\/span> string<\/span>.as_slice<\/span>()<\/span> ==<\/span> \"Hello\"<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"yes\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
String\u304b\u3089&str\u3078\u306e\u5909\u63db\u306f\u5b89\u4fa1\u3067\u3059\u304c\u3001\u9006\u306b&str\u304b\u3089String\u3078\u306e\u5909\u63db\u306b\u306f\u30e1\u30e2\u30ea\u5272\u5f53\u304c\u4f34\u3044\u307e\u3059\u3002\u305d\u3046\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u306e\u3067\u306f\u306a\u3044\u9650\u308a\u3001\u305d\u306e\u3088\u3046\u306a\u5909\u63db\u3092\u3059\u308b\u7406\u7531\u306f\u307e\u3063\u305f\u304f\u3042\u308a\u307e\u305b\u3093\uff01
\nRust\u306e\u6587\u5b57\u5217\u306e\u57fa\u672c\u306f\u3053\u3093\u306a\u3068\u3053\u308d\u3067\u3059\uff01 \u3082\u3057\u30b9\u30af\u30ea\u30d7\u30c8\u8a00\u8a9e\u304b\u3089\u3084\u3063\u3066\u304d\u305f\u306a\u3089\u3070\u3001\u305d\u308c\u3089\u306e\u8a00\u8a9e\u3067\u6163\u308c\u89aa\u3057\u3093\u3067\u304d\u305f\u3088\u308a\u306f\u6050\u3089\u304f\u5c11\u3057\u3070\u304b\u308a\u8907\u96d1\u3067\u306f\u3042\u308b\u3067\u3057\u3087\u3046\u304c\u3001\u4f4e\u6c34\u6e96\u306e\u7d30\u90e8\u304c\u91cd\u8981\u306b\u306a\u308b\u5834\u5408\u306b\u306f\u3001\u305d\u308c\u306f\u672c\u5f53\u306b\u91cd\u8981\u306a\u306e\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u305f\u3060\u3001String\u304c\u30e1\u30e2\u30ea\u5272\u5f53\u3092\u4f34\u3044\u30c7\u30fc\u30bf\u3092\u5236\u5fa1\u3059\u308b\u306e\u306b\u5bfe\u3057\u3066\u3001&str\u306f\u5225\u306e\u6587\u5b57\u5217\u3078\u306e\u53c2\u7167\u3067\u3042\u308b\u3001\u3068\u3044\u3046\u3053\u3068\u3060\u3051\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u3046\u3059\u308c\u3070\u3001\u305d\u308c\u3067\u6e96\u5099\u4e07\u7aef\u3067\u3059\u3002<\/p>\n
12. \u30d9\u30af\u30bf\u30fc<\/h1>\n
\u4ed6\u306e\u591a\u304f\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u540c\u69d8\u306b\u3001Rust\u306b\u3082\u3001\u306a\u306b\u304b\u306e\u3082\u306e\u306e\u30ea\u30b9\u30c8\u304c\u6b32\u3057\u3044\u6642\u306e\u305f\u3081\u306e\u30ea\u30b9\u30c8\u578b\u304c\u5099\u308f\u3063\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u6587\u5b57\u5217\u306e\u5834\u5408\u3068\u540c\u69d8\u306b\u3001\u30ea\u30b9\u30c8\u3068\u3044\u3046\u767a\u60f3\u3092\u8868\u73fe\u3059\u308b\u578b\u304c\u3001Vec\uff08\u3053\u308c\u306f\u300c\u30d9\u30af\u30bf\u30fc\u300d\uff09\u3001[T, .. N]\uff08\u3053\u308c\u306f\u300c\u914d\u5217\u300d\uff09\u3001&[T]\uff08\u3053\u308c\u306f\u300c\u30b9\u30e9\u30a4\u30b9\u300d\uff09\u3068\u3001\u69d8\u3005\u3042\u308a\u307e\u3059\u3002\u30d2\u30e5\uff5e\uff01
\n\u30d9\u30af\u30bf\u30fc\u306f\u6587\u5b57\u5217\u306b\u4f3c\u3066\u3044\u3066\u3001\u52d5\u7684\u306a\u9577\u3055\u3092\u6301\u3061\u3001\u305d\u308c\u306b\u30d5\u30a3\u30c3\u30c8\u3059\u308b\u306e\u306b\u5145\u5206\u306a\u30e1\u30e2\u30ea\u3092\u5272\u5f53\u3057\u307e\u3059\u3002\u30d9\u30af\u30bf\u30fc\u306fvec!\u30de\u30af\u30ed\u306b\u3088\u3063\u3066\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
let<\/span> nums<\/span> =<\/span> vec!<\/span>[<\/span>1<\/span>i<\/span>,<\/span> 2<\/span>i<\/span>,<\/span> 3<\/span>i<\/span>];<\/span>\r\n<\/code><\/pre>\n
\u524d\u306b\u4f7f\u3063\u305f\u3053\u3068\u306e\u3042\u308bprintln!()\u30de\u30af\u30ed\u3068\u9055\u3063\u3066\u3001vec!\u3067\u306f\u89d2\u62ec\u5f27([])\u3092\u4f7f\u3063\u3066\u3044\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5b9f\u306fRust\u3067\u306f\u3069\u3061\u3089\u306e\u5834\u5408\u306b\u3082\u3069\u3061\u3089\u3092\u4f7f\u3046\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u5358\u306a\u308b\u898f\u7d04\u7684\u6163\u7fd2\u306b\u904e\u304e\u307e\u305b\u3093\u3002
\n\u914d\u5217\u306f\u5358\u306b\u89d2\u62ec\u5f27\u3060\u3051\u3067\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
let<\/span> nums<\/span> =<\/span> [<\/span>1<\/span>i<\/span>,<\/span> 2<\/span>i<\/span>,<\/span> 3<\/span>i<\/span>];<\/span>\r\nlet<\/span> nums<\/span> =<\/span> [<\/span>1<\/span>i<\/span>,<\/span> ..<\/span>20<\/span>];<\/span> \/\/ \u3053\u308c\u306f\u5168\u8981\u7d20\u304c1\u306b\u521d\u671f\u5316\u3055\u308c\u305f\u8981\u7d20\u657020\u306e\u914d\u5217\u306e\u7565\u8a18\u6cd5\u3067\u3059<\/span>\r\n<\/code><\/pre>\n
\u3067\u306f\u3001\u30d9\u30af\u30bf\u30fc\u3068\u914d\u5217\u306e\u9055\u3044\u306f\u306a\u3093\u3067\u3057\u3087\u3046\u304b\uff1f \u914d\u5217\u306f\u56fa\u5b9a\u30b5\u30a4\u30ba\u3092\u6301\u3061\u3001\u8981\u7d20\u3092\u4ed8\u3051\u52a0\u3048\u305f\u308a\u5dee\u3057\u5f15\u3044\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\uff1a<\/p>\n
let<\/span> mut<\/span> nums<\/span> =<\/span> vec!<\/span>[<\/span>1<\/span>i<\/span>,<\/span> 2<\/span>i<\/span>,<\/span> 3<\/span>i<\/span>];<\/span>\r\nnums<\/span>.push<\/span>(<\/span>4<\/span>i<\/span>);<\/span> \/\/ \u3053\u308c\u306f\u6b63\u3057\u304f\u52d5\u4f5c\u3057\u307e\u3059<\/span>\r\n\r\nlet<\/span> mut<\/span> nums<\/span> =<\/span> [<\/span>1<\/span>i<\/span>,<\/span> 2<\/span>i<\/span>,<\/span> 3<\/span>i<\/span>];<\/span>\r\nnums<\/span>.push<\/span>(<\/span>4<\/span>i<\/span>);<\/span> \/\/ error: type `[int, .. 3]` does not implement any method<\/span>\r\n               \/\/ in scope named `push`<\/span>\r\n<\/code><\/pre>\n
push()\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u3063\u3066\u3001\u30d9\u30af\u30bf\u30fc\u306e\u672b\u7aef\u306b\u5024\u3092\u9644\u52a0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u914d\u5217\u306f\u56fa\u5b9a\u30b5\u30a4\u30ba\u3067\u3059\u304b\u3089\u3001\u8981\u7d20\u3092\u4ed8\u3051\u52a0\u3048\u308b\u3068\u3044\u3046\u3053\u3068\u306f\u610f\u5473\u3092\u306a\u3057\u307e\u305b\u3093\u3002\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304b\u3089\u3053\u306e\u914d\u5217\u304c\u6301\u3063\u3066\u3044\u308b\u6b63\u78ba\u306a\u578b\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002[int, ..3]\u3001\u3064\u307e\u308a\u9577\u30553\u3092\u4f34\u3063\u305fint\u306e\u914d\u5217\u3067\u3059\u3002
\n\u30b9\u30e9\u30a4\u30b9\u306f\u3001&str\u3068\u540c\u69d8\u3067\u3001\u3082\u3046\u3072\u3068\u3064\u5225\u306e\u914d\u5217\u3078\u306e\u53c2\u7167\u3067\u3059\u3002as_slice()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u306b\u3088\u3063\u3066\u30d9\u30af\u30bf\u30fc\u304b\u3089\u30b9\u30e9\u30a4\u30b9\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
let<\/span> vec<\/span> =<\/span> vec!<\/span>[<\/span>1<\/span>i<\/span>,<\/span> 2<\/span>i<\/span>,<\/span> 3<\/span>i<\/span>];<\/span>\r\nlet<\/span> slice<\/span> =<\/span> vec<\/span>.as_slice<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3089\u306e3\u3064\u306e\u578b\u306f\u5168\u3066\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u8fd4\u3059iter()\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u5f8c\u306b\u8a71\u3092\u3057\u307e\u3059\u304c\u3001\u3044\u307e\u306e\u3068\u3053\u308d\u306f\u3001\u3053\u306eiter()\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u3063\u3066\u3001\u30d9\u30af\u30bf\u30fc\u3001\u914d\u5217\u3001\u30b9\u30e9\u30a4\u30b9\u306e\u4e2d\u8eab\u3092\u8868\u793a\u3059\u308b\u3088\u3046\u306a\u30eb\u30fc\u30d7\u304c\u66f8\u3051\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u5145\u5206\u3067\u3059\uff1a<\/p>\n
let<\/span> vec<\/span> =<\/span> vec!<\/span>[<\/span>1<\/span>i<\/span>,<\/span> 2<\/span>i<\/span>,<\/span> 3<\/span>i<\/span>];<\/span>\r\n\r\nfor<\/span> i<\/span> in<\/span> vec<\/span>.iter<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> i<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u306f\u3001\u5404\u6570\u5b57\u3092\u9806\u306b\u8868\u793a\u3057\u307e\u3059\u3002
\n\u6dfb\u5b57\u8a18\u6cd5 \u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30d9\u30af\u30bf\u30fc\u3001\u914d\u5217\u3001\u30b9\u30e9\u30a4\u30b9\u306e\u7279\u5b9a\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
let<\/span> names<\/span> =<\/span> [<\/span>\"Graydon\"<\/span>,<\/span> \"Brian\"<\/span>,<\/span> \"Niko\"<\/span>];<\/span>\r\n\r\nprintln!<\/span>(<\/span>\"The second name is: {}\"<\/span>,<\/span> names<\/span>[<\/span>1<\/span>]);<\/span>\r\n<\/code><\/pre>\n
\u4ed6\u306e\u6b86\u3069\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u540c\u69d8\u306b\u3001\u3053\u308c\u3089\u306e\u6dfb\u5b57\u306f\u30bc\u30ed\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002\u3067\u3059\u304b\u3089\u3001\u6700\u521d\u306e\u540d\u524d\u306fnames[0]\u3067\u30012\u756a\u76ee\u306e\u540d\u524d\u304cnames[1]\u306b\u306a\u308a\u307e\u3059\u3002\u4e0a\u306e\u4f8b\u306e\u30b3\u30fc\u30c9\u306f\u3001The second name is Brian\u3068\u8868\u793a\u3057\u307e\u3059\u3002
\n\u30d9\u30af\u30bf\u30fc\u306b\u3064\u3044\u3066\u306f\u66f4\u306b\u3082\u3063\u3068\u305f\u304f\u3055\u3093\u306e\u3053\u3068\u304c\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u624b\u59cb\u3081\u306b\u306f\u3053\u308c\u3067\u5145\u5206\u3067\u3057\u3087\u3046\u3002\u3055\u3066\u3001Rust\u306e\u6700\u3082\u57fa\u672c\u7684\u306a\u6982\u5ff5\u306b\u3064\u3044\u3066\u306f\u5168\u90e8\u3092\u5b66\u7fd2\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u3067\u3001\u6570\u5f53\u3066\u30b2\u30fc\u30e0\u3092\u30d3\u30eb\u30c9\u3057\u59cb\u3081\u308b\u6e96\u5099\u304c\u3067\u304d\u305f\u308f\u3051\u3067\u3059\u304c\u3001\u307e\u305a\u6700\u521d\u306b\u3001\u77e5\u3063\u3066\u304a\u304f\u3079\u304d\u6700\u5f8c\u306e\u3053\u3068\u3001\u3064\u307e\u308a\u3001\u30ad\u30fc\u30dc\u30fc\u30c9\u304b\u3089\u306e\u5165\u529b\u306e\u53d7\u3051\u53d6\u308a\u65b9\u3001\u3092\u77e5\u3063\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6570\u5f53\u3066\u3092\u3059\u308b\u80fd\u529b\u629c\u304d\u306b\u6570\u5f53\u3066\u30b2\u30fc\u30e0\u306f\u3067\u304d\u307e\u305b\u3093\u304b\u3089\uff01<\/p>\n
13. \u6a19\u6e96\u5165\u529b<\/h1>\n
\u30ad\u30fc\u30dc\u30fc\u30c9\u304b\u3089\u306e\u5165\u529b\u3092\u53d7\u3051\u53d6\u308b\u306e\u306f\u3068\u3066\u3082\u7c21\u5358\u3067\u3059\u304c\u3001\u307e\u3060\u76ee\u306b\u3057\u3066\u3044\u306a\u3044\u4e8b\u9805\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u5165\u529b\u3092\u8aad\u3093\u3067\u305d\u308c\u3092\u66f8\u304d\u623b\u3059\u5358\u7d14\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\uff1a<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Type something!\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> std<\/span>::<\/span>io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>.ok<\/span>()<\/span>.expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> input<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3055\u3042\u3001\u3053\u306e\u584a\u3092\u3072\u3068\u3064\u305a\u3064\u898b\u3066\u884c\u304d\u307e\u3057\u3087\u3046\uff1a<\/p>\n
std<\/span>::<\/span>io<\/span>::<\/span>stdin<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u306fstd::io\u3068\u3044\u3046\u30e2\u30b8\u30e5\u30fc\u30eb\u5185\u306b\u3042\u308bstdin()\u3068\u3044\u3046\u51fd\u6570\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002\u60f3\u50cf\u3067\u304d\u308b\u3068\u601d\u3044\u307e\u3059\u304c\u3001std\u5185\u306b\u3042\u308b\u3082\u306e\u306f\u5168\u3066Rust\u306b\u3088\u3063\u3066\u300c\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u300d\u3068\u3057\u3066\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30e2\u30b8\u30e5\u30fc\u30eb\u30b7\u30b9\u30c6\u30e0\u306b\u3064\u3044\u3066\u306f\u5f8c\u306b\u3082\u3063\u3068\u304a\u8a71\u3057\u307e\u3059\u3002
\n\u5b8c\u5168\u306a\u4fee\u98fe\u540d\u3092\u3044\u3064\u3067\u3082\u66f8\u304b\u3055\u308c\u308b\u306e\u306f\u30a4\u30e9\u30a4\u30e9\u3055\u305b\u3089\u308c\u308b\u3082\u306e\u3067\u3059\u304b\u3089\u3001\u3053\u306e\u51fd\u6570\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u969b\u306buse\u6587\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>::<\/span>stdin<\/span>;<\/span>\r\n\r\nstdin<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u500b\u3005\u306e\u51fd\u6570\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u3001\u304b\u30641\u968e\u5c64\u3060\u3051\u306e\u4fee\u98fe\u3092\u7528\u3044\u308b\u3053\u3068\u304c\u3001\u826f\u3044\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3060\u3068\u8003\u3048\u3089\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\n\r\nio<\/span>::<\/span>stdin<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u4e0a\u306e\u4f8b\u3092\u3001\u3053\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u4f7f\u3046\u3088\u3046\u306b\u3057\u3066\u66f4\u65b0\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Type something!\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>.ok<\/span>()<\/span>.expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> input<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6b21\u306b\u6765\u308b\u306e\u306f:<\/p>\n
.read_line<\/span>()<\/span>\r\n<\/code><\/pre>\n
\u3067\u3059\u3002read_line()\u30e1\u30bd\u30c3\u30c9\u306f\u3001stdin()\u306e\u7d50\u679c\u306b\u5bfe\u3057\u3066\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u3001\u5165\u529b\u30921\u884c\u307e\u308b\u3054\u3068\u8fd4\u3057\u307e\u3059\u3002\u7d20\u6674\u3089\u3057\u304f\u7c21\u5358\u3067\u3059\u306d\u3002<\/p>\n
.ok<\/span>()<\/span>.expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u899a\u3048\u3066\u3044\u307e\u3059\u304b\uff1f<\/p>\n
enum<\/span> OptionalInt<\/span> {<\/span>\r\n    Value<\/span>(<\/span>int<\/span>),<\/span>\r\n    Missing<\/span>,<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> Value<\/span>(<\/span>5<\/span>);<\/span>\r\n    let<\/span> y<\/span> =<\/span> Missing<\/span>;<\/span>\r\n\r\n    match<\/span> x<\/span> {<\/span>\r\n        Value<\/span>(<\/span>n<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"x is {:d}\"<\/span>,<\/span> n<\/span>),<\/span>\r\n        Missing<\/span> =><\/span> println!<\/span>(<\/span>\"x is missing!\"<\/span>),<\/span>\r\n    }<\/span>\r\n\r\n    match<\/span> y<\/span> {<\/span>\r\n        Value<\/span>(<\/span>n<\/span>)<\/span> =><\/span> println!<\/span>(<\/span>\"y is {:d}\"<\/span>,<\/span> n<\/span>),<\/span>\r\n        Missing<\/span> =><\/span> println!<\/span>(<\/span>\"y is missing!\"<\/span>),<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5024\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u77e5\u308b\u305f\u3081\u306b\u306f\u6bce\u56de\u30de\u30c3\u30c1\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3067\u3057\u305f\u306d\u3002\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u3053\u306e\u5834\u5408\u306b\u306fx\u304cValue\u306e\u5024\u3092\u6301\u3063\u3066\u3044\u308b\u3053\u3068\u306f\u308f\u304b\u3063\u3066\u3044\u307e\u3059\u3002\u305d\u308c\u3067\u3082\u3001match\u306fMissing\u306e\u5834\u5408\u3082\u53d6\u308a\u6271\u3046\u3088\u3046\u6211\u3005\u306b\u5f37\u5236\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u78ba\u304b\u306b99%\u306e\u5834\u5408\u306b\u306f\u671b\u3093\u3067\u3044\u308b\u52d5\u4f5c\u3067\u3059\u304c\u3001\u6642\u306b\u306f\u3001\u6211\u3005\u306e\u307b\u3046\u304c\u30b3\u30f3\u30d1\u30a4\u30e9\u3088\u308a\u3082\u3088\u304f\u308f\u304b\u3063\u3066\u3044\u308b\u3068\u3044\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002
\n\u540c\u69d8\u306b\u3057\u3066\u3001read_line()\u3082\u5165\u529b\u30921\u884c\u8fd4\u3057\u3066\u304f\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002read_line\u306f\u5165\u529b\u30921\u884c\u8fd4\u3057\u3066\u304f\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3057\u3001\u307e\u305f\u8fd4\u3057\u3066\u3053\u306a\u3044\u304b\u3082\u3057\u308c\u306a\u3044\u306e\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u30bf\u30fc\u30df\u30ca\u30eb\u3067\u306f\u306a\u304f\u3001cron\u30b8\u30e7\u30d6\u3060\u3068\u304b\u306a\u306b\u304b\u307b\u304b\u306e\u3001\u6a19\u6e96\u5165\u529b\u304c\u306a\u3044\u3088\u3046\u306a\u6587\u8108\u3067\u5b9f\u884c\u3055\u308c\u308b\u5834\u5408\u306b\u8d77\u3053\u308a\u3048\u307e\u3059\u3002\u3053\u306e\u305f\u3081\u3001read_line\u306f\u3001\u65e2\u51fa\u306eOptionalInt\u3068\u5927\u5909\u306b\u3088\u304f\u4f3c\u305f\u3001IoResult\u3068\u3044\u3046\u578b\u3092\u8fd4\u3057\u3066\u304d\u307e\u3059\u3002IoResult\u3068\u3044\u3046\u578b\u306f\u3001OptionalInt\u306e\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u306a\u5f62\u5f0f\u306a\u306e\u3067\u3001\u3053\u308c\u306b\u3064\u3044\u3066\u306f\u307e\u3060\u304a\u8a71\u3092\u3057\u3066\u3044\u307e\u305b\u3093\u3002\u305d\u306e\u8a71\u3092\u3059\u308b\u3068\u304d\u307e\u3067\u306f\u3001\u305f\u3060\u3053\u308c\u3092int\u3060\u3051\u3067\u306f\u306a\u304f\u4ed6\u306e\u3069\u3093\u306a\u578b\u306b\u3082\u4f7f\u3048\u308b\u3060\u3051\u3067\u3001\u540c\u3058\u3082\u306e\u3060\u3001\u3068\u8003\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002
\nRust\u306f\u3053\u308c\u3089\u306eIoResult\u306b\u5bfe\u3059\u308bok()\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306fmatch\u6587\u3068\u540c\u3058\u3053\u3068\u3092\u3059\u308b\u306e\u3067\u3059\u304c\u3001\u6709\u52b9\u306a\u5024\u304c\u3042\u308b\u3082\u306e\u3068\u60f3\u5b9a\u3057\u3066\u305d\u308c\u3092\u884c\u3044\u307e\u3059\u3002\u305d\u308c\u304b\u3089\u3001\u305d\u306e\u7d50\u679c\u306b\u5bfe\u3057\u3066expect()\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u304c\u3001\u3053\u308c\u306f\u6709\u52b9\u306a\u5024\u304c\u306a\u3044\u3068\u305d\u3053\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d42\u4e86\u3055\u305b\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3044\u307e\u306e\u5834\u5408\u3001\u5165\u529b\u304c\u5f97\u3089\u308c\u306a\u3044\u306a\u3089\u3070\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u52d5\u4f5c\u3057\u306a\u3044\u306e\u3067\u3059\u304b\u3089\u3001\u305d\u3053\u306e\u3068\u3053\u308d\u306f\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002\u3067\u3059\u304c\u3001\u6b86\u3069\u306e\u5834\u5408\u306b\u306f\u3001\u30a8\u30e9\u30fc\u306e\u5834\u5408\u3092\u660e\u793a\u7684\u306b\u51e6\u7406\u3057\u305f\u3044\u306f\u305a\u3067\u3059\u3002\u3053\u306e\u30af\u30e9\u30c3\u30b7\u30e5\u304c\u8d77\u304d\u308b\u5834\u5408\u306bexpect()\u306b\u3088\u3063\u3066\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\n\u3053\u308c\u3089\u5168\u3066\u304c\u3069\u306e\u3088\u3046\u306b\u52d5\u4f5c\u3057\u3066\u3044\u308b\u306e\u304b\u306b\u3064\u3044\u3066\u306e\u6b63\u78ba\u306a\u8a73\u7d30\u306f\u30ac\u30a4\u30c9\u306e\u5f8c\u306e\u65b9\u3067\u6271\u3044\u307e\u3059\u304c\u3001\u4eca\u306e\u3068\u3053\u308d\u306f\u3001\u3053\u308c\u3067\u4f5c\u696d\u3059\u308b\u306e\u306b\u5145\u5206\u306a\u57fa\u672c\u7684\u7406\u89e3\u304c\u5f97\u3089\u308c\u308b\u306f\u305a\u3067\u3059\u3002
\n\u4f5c\u696d\u4e2d\u306e\u30b3\u30fc\u30c9\u306b\u623b\u308a\u307e\u3057\u3087\u3046\uff01 \u30b3\u30fc\u30c9\u3092\u518d\u63b2\u3057\u307e\u3059\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Type something!\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>.ok<\/span>()<\/span>.expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> input<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u3046\u3044\u3046\u9577\u3044\u884c\u306b\u3064\u3044\u3066\u306f\u3001Rust\u306f\u7a7a\u767d\u306b\u95a2\u3057\u3066\u5e7e\u3089\u304b\u878d\u901a\u3092\u5229\u304b\u305b\u3066\u304f\u308c\u307e\u3059\u3002\u3053\u306e\u4f8b\u306f\u6b21\u306e\u3088\u3046\u306b\u66f8\u304f\u3053\u3068\u3082\u3067\u304d\u308b\u306e\u3067\u3059\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Type something!\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>\r\n                  .read_line<\/span>()<\/span>\r\n                  .ok<\/span>()<\/span>\r\n                  .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> input<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u3088\u3046\u306a\u66f8\u304d\u65b9\u3092\u3059\u308b\u3053\u3068\u3067\u30b3\u30fc\u30c9\u304c\u8aad\u307f\u3084\u3059\u304f\u306a\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u8aad\u307f\u306b\u304f\u304f\u306a\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u81ea\u5206\u306e\u5224\u65ad\u529b\u3092\u304d\u3061\u3093\u3068\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\u3002
\n\u3053\u308c\u3067\u6a19\u6e96\u5165\u529b\u304b\u3089\u57fa\u672c\u7684\u306a\u5165\u529b\u3092\u5f97\u308b\u306e\u306b\u5fc5\u8981\u306a\u5168\u3066\u304c\u63c3\u3044\u307e\u3057\u305f\uff01 \u3055\u307b\u3069\u8fbc\u307f\u5165\u3063\u3066\u306f\u3044\u307e\u305b\u3093\u304c\u3001\u7d30\u304b\u3044\u90e8\u5206\u304c\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3057\u305f\u306d\u3002<\/p>\n
14. \u6570\u5f53\u3066\u30b2\u30fc\u30e0<\/h1>\n
OK! Rust\u306e\u57fa\u672c\u306f\u30de\u30b9\u30bf\u30fc\u3057\u307e\u3057\u305f\u3002\u3082\u3063\u3068\u5927\u304d\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304d\u307e\u3057\u3087\u3046\u3002
\n\u6700\u521d\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3068\u3057\u3066\u3001\u53e4\u5178\u7684\u306a\u5165\u9580\u8005\u7528\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8ab2\u984c\u3067\u3042\u308b\u3001\u6570\u5f53\u3066\u30b2\u30fc\u30e0\u3092\u5b9f\u88c5\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u305d\u306e\u52d5\u4f5c\u306f\u3053\u3046\u306a\u308a\u307e\u3059\u30021\u304b\u3089100\u306e\u9593\u306e\u3042\u308b\u30e9\u30f3\u30c0\u30e0\u306a\u6574\u6570\u3092\u751f\u6210\u3057\u307e\u3059\u3002\u305d\u308c\u304b\u3089\u3001\u6211\u3005\u306b\u305d\u306e\u6570\u306b\u3064\u3044\u3066\u306e\u63a8\u6e2c\u5024\u3092\u5165\u529b\u3059\u308b\u3088\u3046\u4fc3\u3057\u307e\u3059\u3002\u63a8\u6e2c\u5024\u3092\u5165\u529b\u3059\u308b\u3068\u76f4\u3061\u306b\u3001\u305d\u308c\u304c\u4f4e\u3059\u304e\u308b\u304b\u9ad8\u3059\u304e\u308b\u304b\u3092\u793a\u3057\u307e\u3059\u3002\u6b63\u3057\u304f\u63a8\u6e2c\u3067\u304d\u305f\u306a\u3089\u3001\u304a\u3081\u3067\u3068\u3046\u3092\u3044\u3044\u3001\u305d\u3053\u307e\u3067\u306b\u53d6\u3089\u308c\u305f\u63a8\u6e2c\u5024\u3092\u8868\u793a\u3057\u307e\u3059\u3002\u3088\u3055\u3052\u3067\u3059\u3088\u306d\uff1f<\/p>\n
14.1. \u30bb\u30c3\u30c8\u30a2\u30c3\u30d7<\/h2>\n
\u65b0\u898f\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3057\u307e\u3057\u3087\u3046\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30fb\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u884c\u3063\u3066\u304f\u3060\u3055\u3044\u3002hello_world\u306e\u3068\u304d\u306b\u3069\u3046\u3044\u3046\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u69cb\u9020\u3068Cargo.toml\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u305f\u304b\u899a\u3048\u3066\u3044\u307e\u3059\u304b\uff1f Cargo\u306b\u306f\u305d\u308c\u3092\u79c1\u9054\u306b\u4ee3\u308f\u3063\u3066\u3084\u3063\u3066\u304f\u308c\u308b\u30b3\u30de\u30f3\u30c9\u304c\u5099\u308f\u3063\u3066\u3044\u307e\u3059\u3002\u3084\u3063\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> cd<\/span> ~\/projects\r\n$<\/span> cargo new guessing_game --bin<\/span>\r\n$<\/span> cd <\/span>guessing_game\r\n<\/code><\/pre>\n
\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u540d\u524d\u3092cargo new\u306b\u6e21\u3057\u3001\u305d\u308c\u304b\u3089–bin\u30d5\u30e9\u30b0\u3092\u6e21\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u79c1\u9054\u304c\u4f5c\u308d\u3046\u3068\u3057\u3066\u3044\u308b\u306e\u306f\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u306f\u306a\u304f\u30d0\u30a4\u30ca\u30ea\u30d5\u30a1\u30a4\u30eb\u3060\u304b\u3089\u3067\u3059\u3002
\n\u751f\u6210\u3055\u308c\u305fCargo.html\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
[package]\r\n\r\nname = \"guessing_game\"\r\nversion = \"0.0.1\"\r\nauthors = [\"Your Name <you@example.com>\"]\r\n<\/code><\/pre>\n
Cargo\u306f\u3053\u306e\u60c5\u5831\u3092\u3042\u306a\u305f\u306e\u74b0\u5883\u304b\u3089\u53d6\u5f97\u3057\u307e\u3059\u3002\u3082\u3057\u305d\u308c\u304c\u6b63\u3057\u304f\u306a\u3051\u308c\u3070\u3001\u3069\u3046\u305e\u4fee\u6b63\u3057\u3066\u304f\u3060\u3055\u3044\u3002
\n\u6700\u5f8c\u306b\u3001Cargo\u306fhello, world\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u751f\u6210\u3057\u3066\u3044\u307e\u3059\u3002src\/main.rs\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Hello, world!\"<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Cargo\u304c\u4f5c\u3063\u3066\u304f\u308c\u305f\u3082\u306e\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> cargo build\r\n    Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\n<\/span><\/code><\/pre>\n
\u30a8\u30af\u30bb\u30ec\u30f3\u30c8\uff01 src\/main.rs\u3092\u3082\u3046\u4e00\u5ea6\u958b\u304d\u307e\u3057\u3087\u3046\u3002\u30b3\u30fc\u30c9\u306f\u5168\u90e8\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u66f8\u3044\u3066\u3044\u304d\u307e\u3059\u3002\u8907\u6570\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u3046\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u3064\u3044\u3066\u306f\u3053\u306e\u30ac\u30a4\u30c9\u306e\u5f8c\u306e\u65b9\u3067\u304a\u8a71\u3057\u307e\u3059\u3002
\n\u5148\u306b\u9032\u3080\u524d\u306b\u3001Cargo\u306e\u30b3\u30de\u30f3\u30c9\u3092\u3082\u3046\u4e00\u3064\u304a\u77e5\u3089\u305b\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u305d\u308c\u306frun\u3067\u3059\u3002cargo run\u306fcargo build\u3068\u4f3c\u305f\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u304c\u3001\u66f4\u306b\u3001\u751f\u6210\u3055\u308c\u305f\u5b9f\u884c\u53ef\u80fd\u30d5\u30a1\u30a4\u30eb\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> cargo run\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\n     Running `target\/guessing_game`\r\nHello, world!\r\n<\/span><\/code><\/pre>\n
\u30b0\u30ec\u30fc\u30c8\uff01 run\u30b3\u30de\u30f3\u30c9\u306f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066\u7d20\u65e9\u304f\u4f5c\u696d\u3092\u53cd\u5fa9\u3059\u308b\u3068\u304d\u306b\u5f79\u306b\u305f\u3061\u307e\u3059\u3002\u6570\u5f53\u3066\u30b2\u30fc\u30e0\u306f\u307e\u3055\u306b\u305d\u3046\u3044\u3046\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3001\u6b21\u306e\u4f5c\u696d\u306b\u884c\u304f\u524d\u306b\u6bce\u56de\u7d20\u65e9\u304f\u30c6\u30b9\u30c8\u3092\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u306e\u3067\u3059\u3002<\/p>\n
14.2. \u63a8\u6e2c\u3092\u51e6\u7406\u3059\u308b<\/h2>\n
\u3055\u3042\u59cb\u3081\u307e\u3057\u3087\u3046\u3002\u6570\u5f53\u3066\u30b2\u30fc\u30e0\u306e\u305f\u3081\u306b\u6700\u521d\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u306e\u306f\u3001\u30d7\u30ec\u30a4\u30e4\u30fc\u304c\u63a8\u6e2c\u5024\u3092\u5165\u529b\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u3082\u306e\u3092src\/main.rs\u306b\u66f8\u304d\u8fbc\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                           .ok<\/span>()<\/span>\r\n                           .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> input<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u30b3\u30fc\u30c9\u306b\u3064\u3044\u3066\u306f\u3001\u6a19\u6e96\u5165\u529b\u306e\u8a71\u3092\u3057\u305f\u3068\u304d\u306b\u65e2\u306b\u898b\u305f\u3053\u3068\u304c\u3042\u308b\u306f\u305a\u3067\u3059\u3002std::io\u30e2\u30b8\u30e5\u30fc\u30eb\u3092use\u3092\u4f7f\u3063\u3066\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u3001\u305d\u308c\u304b\u3089main\u51fd\u6570\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30ed\u30b8\u30c3\u30af\u3092\u7f6e\u304d\u307e\u3059\u3002\u30b2\u30fc\u30e0\u306e\u30a2\u30ca\u30a6\u30f3\u30b9\u3092\u3059\u308b\u3061\u3087\u3063\u3068\u3057\u305f\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3057\u3066\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u63a8\u6e2c\u5024\u3092\u5165\u529b\u3059\u308b\u3088\u3046\u6c42\u3081\u3001\u5165\u529b\u3092\u53d6\u5f97\u3057\u3066\u3001\u305d\u308c\u3092\u8868\u793a\u3057\u307e\u3059\u3002
\n\u3053\u308c\u306b\u3064\u3044\u3066\u306f\u6a19\u6e96\u5165\u51fa\u529b\u306b\u3064\u3044\u3066\u306e\u7bc0\u3067\u8a71\u3092\u3057\u307e\u3057\u305f\u304b\u3089\u3001\u3053\u3053\u3067\u306f\u8a73\u7d30\u306b\u7acb\u3061\u5165\u308a\u307e\u305b\u3093\u3002\u3082\u3057\u5fa9\u7fd2\u304c\u5fc5\u8981\u306a\u3089\u3001\u305d\u306e\u7bc0\u3092\u518d\u8aad\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
14.3. \u79d8\u5bc6\u306e\u6570\u3092\u751f\u6210\u3059\u308b<\/h2>\n
\u6b21\u306b\u3001\u79d8\u5bc6\u306e\u6570\u3092\u751f\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u306b\u306f\u3001\u307e\u3060\u304a\u8a71\u3057\u3066\u3044\u306a\u3044Rust\u306e\u30e9\u30f3\u30c0\u30e0\u6570\u5024\u751f\u6210\u6a5f\u80fd\u3092\u4f7f\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002Rust\u306f\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u591a\u6570\u306e\u8208\u5473\u6df1\u3044\u51fd\u6570\u3092\u53ce\u9332\u3057\u3066\u3044\u307e\u3059\u3002\u3082\u3057\u3061\u3087\u3063\u3068\u3057\u305f\u30b3\u30fc\u30c9\u304c\u5fc5\u8981\u306a\u3089\u3001\u305d\u308c\u304c\u3042\u306a\u305f\u306e\u305f\u3081\u306b\u65e2\u306b\u66f8\u304b\u308c\u3066\u3044\u308b\u3001\u3068\u3044\u3046\u3053\u3068\u304c\u3042\u308a\u3046\u308b\u306e\u3067\u3059\uff01 \u3044\u307e\u306e\u5834\u5408\u306b\u306f\u3001Rust\u306b\u30e9\u30f3\u30c0\u30e0\u6570\u5024\u751f\u6210\u304c\u3042\u308b\u3053\u3068\u306f\u308f\u304b\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u308c\u3092\u3069\u3046\u4f7f\u3046\u304b\u304c\u308f\u304b\u3063\u3066\u3044\u307e\u305b\u3093\u3002
\n\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3078\u884c\u304d\u307e\u3057\u3087\u3046\u3002Rust\u306b\u306f\u7279\u306b\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5316\u306e\u305f\u3081\u306e\u30da\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u30da\u30fc\u30b8\u306f\u3053\u3053\u3067\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30da\u30fc\u30b8\u306b\u306f\u305f\u304f\u3055\u3093\u306e\u60c5\u5831\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4e00\u756a\u306e\u512a\u308c\u3082\u306e\u306f\u691c\u7d22\u30d0\u30fc\u3067\u3059\u3002\u3061\u3087\u3046\u3069\u53f3\u4e0a\u306b\u691c\u7d22\u8a9e\u3092\u5165\u529b\u3067\u304d\u308b\u30dc\u30c3\u30af\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u691c\u7d22\u6a5f\u80fd\u306f\u3044\u307e\u306e\u3068\u3053\u306f\u307e\u3060\u304b\u306a\u308a\u539f\u59cb\u7684\u3067\u3059\u304c\u3001\u65e5\u3005\u6539\u5584\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30dc\u30c3\u30af\u30b9\u306b’random’\u3068\u30bf\u30a4\u30d7\u3059\u308b\u3068\u3001\u30da\u30fc\u30b8\u304c\u3053\u308c\u306b\u5207\u308a\u66ff\u308f\u308a\u307e\u3059\u3002\u691c\u7d22\u7d50\u679c\u306e\u307e\u3055\u306b\u4e00\u756a\u6700\u521d\u304cstd::rand::random\u3078\u306e\u30ea\u30f3\u30af\u3067\u3059\u3002\u305d\u308c\u3092\u30af\u30ea\u30c3\u30af\u3059\u308c\u3070\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u30da\u30fc\u30b8\u306b\u884c\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\n\u3053\u306e\u30da\u30fc\u30b8\u304b\u3089\u5e7e\u3064\u304b\u306e\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002\u51fd\u6570\u306e\u578b\u30b7\u30b0\u30ca\u30c1\u30e3\u3001\u3044\u304f\u3070\u304f\u304b\u306e\u8aac\u660e\u6587\u3001\u305d\u3057\u3066\u4f7f\u7528\u4f8b\u3067\u3059\u3002\u30b3\u30fc\u30c9\u3092\u4fee\u6b63\u3057\u3066\u3001random\u51fd\u6570\u3092\u8ffd\u52a0\u3057\u307e\u3057\u3087\u3046\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>()<\/span> %<\/span> 100<\/span>i<\/span>)<\/span> +<\/span> 1<\/span>i<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                           .ok<\/span>()<\/span>\r\n                           .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> input<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6700\u521d\u306b\u5909\u66f4\u3057\u305f\u306e\u306f\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u8aac\u660e\u901a\u308a\u3001use std::rand\u3092\u4f7f\u3046\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u305d\u308c\u304b\u3089\u3001let\u5f0f\u3092\u4ed8\u3051\u52a0\u3048\u3066secret_number\u3068\u3044\u3046\u540d\u524d\u306e\u5909\u6570\u675f\u7e1b\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u7d50\u679c\u3092\u8868\u793a\u3057\u307e\u3059\u3002
\n\u307e\u305f\u3001\u306a\u3093\u3067rand::random()\u306e\u7d50\u679c\u306b\u5bfe\u3057\u3066%\u3092\u4f7f\u3063\u3066\u3044\u308b\u306e\u304b\u3001\u3068\u601d\u3063\u305f\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u3053\u306e\u6f14\u7b97\u5b50\u306f\u300c\u30e2\u30b8\u30e5\u30ed\u300d\u3068\u547c\u3070\u308c\u3066\u304a\u308a\u3001\u9664\u7b97\u306e\u969b\u306e\u5270\u4f59\u3092\u8fd4\u3057\u307e\u3059\u3002rand::random()\u306e\u7d50\u679c\u306e\u30e2\u30b8\u30e5\u30ed\u3092\u53d6\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u5024\u304c0\u304b\u308999\u306e\u9593\u306b\u53ce\u307e\u308b\u3088\u3046\u306b\u5236\u7d04\u3057\u3066\u3044\u308b\u308f\uff4b\u3067\u3059\u3002\u305d\u308c\u304b\u3089\u3001\u3053\u306e\u7d50\u679c\u306b1\u3092\u52a0\u3048\u3066\u30011\u304b\u3089100\u307e\u3067\u306e\u6570\u306b\u3059\u307e\u3059\u3002\u30e2\u30b8\u30e5\u30ed\u3092\u4f7f\u3046\u3068\u3001\u7d50\u679c\u306b\u3054\u304f\u3054\u304f\u50c5\u304b\u306a\u304c\u3089\u504f\u308a\u304c\u51fa\u308b\u306e\u3067\u3059\u304c\u3001\u3057\u304b\u3057\u3001\u3053\u306e\u4f8b\u306b\u3064\u3044\u3066\u306f\u5927\u3057\u305f\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002
\n\u3053\u308c\u3092cargo build\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> cargo build\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\nsrc\/main.rs:7:26: 7:34 error: the type of this value must be known in this context\r\n<\/span>src\/main.rs:7 let secret_number = (rand::random() % 100i) + 1i;<\/span>\r\n                                   ^~~~~~~~\r\nerror: aborting due to previous error\r\n<\/span><\/code><\/pre>\n
\u3046\u307e\u304f\u3044\u304d\u307e\u305b\u3093\u3067\u3057\u305f\uff01 Rust\u306f\u300c\u3053\u306e\u6587\u8108\u3067\u306f\u3053\u306e\u5024\u306e\u578b\u304c\u77e5\u3089\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u300d\u3068\u8a00\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u308a\u3083\u307e\u305f\u3044\u3063\u305f\u3044\u3069\u3046\u3057\u305f\u3093\u3067\u3057\u3087\u3046\uff1f \u3075\u3080\u3001\u7d50\u8ad6\u304b\u3089\u3044\u3046\u3068\u3001rand::random()\u306f\u3001\u6574\u6570\u3060\u3051\u3067\u306a\u304f\u3054\u304f\u305f\u304f\u3055\u3093\u306e\u7a2e\u985e\u306e\u30e9\u30f3\u30c0\u30e0\u5024\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002\u305d\u3057\u3066\u4eca\u56de\u306e\u5834\u5408\u3001Rust\u306b\u306frandom()\u304c\u3069\u306e\u7a2e\u985e\u306e\u30e9\u30f3\u30c0\u30e0\u5024\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u304b\u304c\u308f\u304b\u3089\u306a\u3044\u306e\u3067\u3059\u3002\u3067\u3059\u304b\u3089\u3001Rust\u3092\u52a9\u3051\u3066\u3042\u3052\u306a\u3044\u3068\u3044\u3051\u307e\u305b\u3093\u3002\u6570\u5b57\u30ea\u30c6\u30e9\u30eb\u3067\u3042\u308c\u3070\u3001\u672b\u5c3e\u306bi\u3092\u3064\u3051\u308b\u3060\u3051\u3067\u3001\u305d\u308c\u304c\u6574\u6570\u3060\u3068\u3044\u3046\u3053\u3068\u3092Rust\u306b\u77e5\u3089\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u308c\u306f\u51fd\u6570\u306b\u3064\u3044\u3066\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u51fd\u6570\u306b\u3064\u3044\u3066\u306f\u5225\u306e\u69cb\u6587\u304c\u3042\u308a\u3001\u3053\u306e\u3088\u3046\u306a\u611f\u3058\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n
rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>int<\/span>><\/span>();<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u306f\u300c\u30e9\u30f3\u30c0\u30e0\u306aint\u5024\u3092\u304f\u3060\u3055\u308b\u3088\u3046\u304a\u9858\u3044\u3057\u307e\u3059\u300d\u3068\u8a00\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30d2\u30f3\u30c8\u3092\u4f7f\u3046\u3088\u3046\u306b\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u3057\u307e\u3057\u3087\u3046\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>int<\/span>><\/span>()<\/span> %<\/span> 100<\/span>i<\/span>)<\/span> +<\/span> 1<\/span>i<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                           .ok<\/span>()<\/span>\r\n                           .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n\r\n println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> input<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u65b0\u3057\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f55\u56de\u304b\u5b9f\u884c\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
$<\/span> cargo run\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\n     Running `target\/guessing_game`\r\nGuess the number!\r\nThe secret number is: 7\r\nPlease input your guess.\r\n4\r\nYou guessed: 4\r\n\r\n<\/span>$<\/span> .\/target\/guessing_game\r\nGuess the number!\r\nThe secret number is: 83\r\nPlease input your guess.\r\n5\r\nYou guessed: 5\r\n\r\n<\/span>$<\/span> .\/target\/guessing_game\r\nGuess the number!\r\nThe secret number is: -29\r\nPlease input your guess.\r\n42\r\nYou guessed: 42\r\n<\/span><\/code><\/pre>\n
\u3061\u3087\u3063\u3068\u5f85\u3063\u305f\u3002-29\u3067\u3059\u3068\uff1f 1\u304b\u3089100\u306e\u6570\u304c\u6b32\u3057\u3044\u3063\u3066\u3044\u3063\u305f\u306e\u306b\uff01 \u3053\u3053\u3067\u306f2\u3064\u306e\u3084\u308a\u65b9\u304c\u3042\u308a\u307e\u3059\u3002random()\u306b\u7b26\u53f7\u306a\u3057\u6574\u6570\uff08\u3053\u308c\u306f\u6b63\u306e\u6570\u306b\u3057\u304b\u306a\u308c\u307e\u305b\u3093\uff09\u3092\u751f\u6210\u3057\u3066\u304f\u308c\u308b\u3088\u3046\u306b\u983c\u3080\u304b\u3001abs()\u51fd\u6570\u3092\u4f7f\u3063\u3066\u7d76\u5bfe\u5024\u3092\u5f97\u308b\u304b\u3001\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u7b26\u53f7\u306a\u3057\u6574\u6570\u306e\u65b9\u3067\u3084\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u30e9\u30f3\u30c0\u30e0\u306a\u6b63\u6570\u304c\u6b32\u3057\u3051\u308c\u3070\u3001\u30e9\u30f3\u30c0\u30e0\u306a\u6b63\u6570\u3092\u8981\u6c42\u3057\u305f\u3089\u3088\u3044\u306e\u3067\u3059\u3002\u4eca\u5ea6\u306f\u30b3\u30fc\u30c9\u306f\u3053\u3093\u306a\u611f\u3058\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>()<\/span> %<\/span> 100u<\/span>)<\/span> +<\/span> 1u<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                           .ok<\/span>()<\/span>\r\n                           .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> input<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3067\u306f\u3001\u8a66\u3057\u3066\u898b\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> cargo run\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\n     Running `target\/guessing_game`\r\nGuess the number!\r\nThe secret number is: 57\r\nPlease input your guess.\r\n3\r\nYou guessed: 3\r\n<\/span><\/code><\/pre>\n
\u30b0\u30ec\u30fc\u30c8\uff01 \u304a\u6b21\u306f\u3001\u79d8\u5bc6\u306e\u5024\u3068\u63a8\u6e2c\u5024\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
14.4. \u63a8\u6e2c\u5024\u3068\u6bd4\u8f03\u3059\u308b<\/h2>\n
\u3053\u306e\u30ac\u30a4\u30c9\u306e\u524d\u306e\u65b9\u3067\u30012\u3064\u306e\u6570\u3092\u6bd4\u8f03\u3059\u308bcmp\u51fd\u6570\u3092\u4f5c\u6210\u3057\u305f\u3053\u3068\u3092\u899a\u3048\u3066\u3044\u307e\u3059\u304b\uff1f \u305d\u308c\u3092\u3001\u63a8\u6e2c\u5024\u3092\u79d8\u5bc6\u306e\u5024\u3068\u6bd4\u3079\u308bmatch\u6587\u3068\u5408\u308f\u305b\u3066\u52a0\u3048\u307e\u3057\u3087\u3046\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>()<\/span> %<\/span> 100u<\/span>)<\/span> +<\/span> 1u<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                           .ok<\/span>()<\/span>\r\n                           .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n\r\n\r\n    println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> input<\/span>);<\/span>\r\n\r\n    match<\/span> cmp<\/span>(<\/span>input<\/span>,<\/span> secret_number<\/span>)<\/span> {<\/span>\r\n        Less<\/span>    =><\/span> println!<\/span>(<\/span>\"Too small!\"<\/span>),<\/span>\r\n        Greater<\/span> =><\/span> println!<\/span>(<\/span>\"Too big!\"<\/span>),<\/span>\r\n        Equal<\/span>   =><\/span> println!<\/span>(<\/span>\"You win!\"<\/span>),<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> int<\/span>,<\/span> b<\/span>:<\/span> int<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n
$<\/span> cargo build\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\nsrc\/main.rs:20:15: 20:20 error: mismatched types: expected `int`\r\nbut found `collections::string::String` (expected int\r\nbut found struct collections::string::String)\r\nsrc\/main.rs:20 match cmp(input, secret_number) {\r\n                         ^~~~~\r\nsrc\/main.rs:20:22: 20:35 error: mismatched types: expected `int` but found `uint` (expected int but found uint)\r\nsrc\/main.rs:20 match cmp(input, secret_number) {\r\n                                ^~~~~~~~~~~~~\r\nerror: aborting due to 2 previous errors\r\n<\/span><\/code><\/pre>\n
\u3053\u308c\u306fRust\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3044\u3066\u3044\u308b\u6642\u306b\u306f\u3088\u304f\u3042\u308b\u3053\u3068\u3067\u3059\u3002\u305d\u3057\u3066\u3001\u3053\u308c\u3053\u305d\u306fRust\u306e\u6700\u3082\u5927\u304d\u306a\u529b\u306e\u3072\u3068\u3064\u3067\u3059\u3002\u306a\u306b\u304b\u306e\u30b3\u30fc\u30c9\u3092\u8a66\u3057\u306b\u66f8\u3044\u3066\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u308b\u304b\u3069\u3046\u304b\u898b\u3066\u307f\u307e\u3059\u3002\u305d\u3046\u3059\u308b\u3068\u3001Rust\u304c\u306a\u306b\u304b\u9593\u9055\u3063\u3066\u307e\u3059\u3088\u3001\u3068\u6559\u3048\u3066\u304f\u308c\u308b\u306e\u3067\u3059\u3002\u4eca\u56de\u306e\u5834\u5408\u3001cmp\u51fd\u6570\u306f\u6574\u6570\u306b\u5bfe\u3057\u3066\u52d5\u4f5c\u3059\u308b\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u306b\u5bfe\u3057\u3066\u7b26\u53f7\u306a\u3057\u6574\u6570\u3092\u4e0e\u3048\u3066\u3057\u307e\u3063\u305f\u306e\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u4fee\u6b63\u306f\u5bb9\u6613\u3067\u3059\u3002\u3060\u3063\u3066\u3001cmp\u51fd\u6570\u306f\u81ea\u5206\u3067\u66f8\u3044\u305f\u306e\u3067\u3059\u304b\u3089\u306d\uff01 \u7b26\u53f7\u306a\u3057\u6574\u6570\u3092\u53d6\u308b\u3088\u3046\u306b\u5909\u66f4\u3057\u307e\u3057\u3087\u3046\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>()<\/span> %<\/span> 100u<\/span>)<\/span> +<\/span> 1u<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                           .ok<\/span>()<\/span>\r\n                           .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n\r\n\r\n    println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> input<\/span>);<\/span>\r\n\r\n    match<\/span> cmp<\/span>(<\/span>input<\/span>,<\/span> secret_number<\/span>)<\/span> {<\/span>\r\n        Less<\/span>    =><\/span> println!<\/span>(<\/span>\"Too small!\"<\/span>),<\/span>\r\n        Greater<\/span> =><\/span> println!<\/span>(<\/span>\"Too big!\"<\/span>),<\/span>\r\n        Equal<\/span>   =><\/span> {<\/span> println!<\/span>(<\/span>\"You win!\"<\/span>);<\/span> },<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> uint<\/span>,<\/span> b<\/span>:<\/span> uint<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3082\u3046\u4e00\u5ea6\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> cargo build\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\nsrc\/main.rs:20:15: 20:20 error: mismatched types: expected `uint`\r\nbut found `collections::string::String` (expected uint but found struct collections::string::String)\r\nsrc\/main.rs:20 match cmp(input, secret_number) {\r\n                         ^~~~~\r\nerror: aborting due to previous error\r\n<\/span><\/code><\/pre>\n
\u3053\u306e\u30a8\u30e9\u30fc\u306f\u5148\u7a0b\u306e\u3082\u306e\u3068\u4f3c\u3066\u3044\u307e\u3059\u3002uint\u3092\u53d6\u5f97\u3059\u308b\u3064\u3082\u308a\u3060\u3063\u305f\u306e\u306b\u3001\u4ee3\u308f\u308a\u306b\u6587\u5b57\u5217\u3092\u53d6\u5f97\u3057\u3066\u3057\u307e\u3063\u3066\u3044\u305f\u306e\u3067\u3057\u305f\uff01 \u3053\u308c\u306f\u3001input\u5909\u6570\u304c\u6a19\u6e96\u5165\u529b\u304b\u3089\u3084\u3063\u3066\u304f\u308b\u304b\u3089\u3067\u3001\u5b9f\u306f\u3069\u3093\u306a\u3082\u306e\u3067\u3082\u63a8\u6e2c\u5024\u306b\u3067\u304d\u3066\u3057\u307e\u3046\u306e\u3067\u3059\u3002\u305f\u3081\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> .\/target\/guessing_game\r\nGuess the number!\r\nThe secret number is: 73\r\nPlease input your guess.\r\nhello\r\nYou guessed: hello\r\n<\/span><\/code><\/pre>\n
\u304a\u304a\u3063\u3068\uff01 \u3042\u3068\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u306a\u304b\u3063\u305f\u306e\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u5b9f\u884c\u3067\u304d\u308b\u3053\u3068\u306b\u6c17\u304c\u4ed8\u304f\u3067\u3057\u3087\u3046\u3002\u3053\u308c\u304c\u3046\u307e\u304f\u3044\u304f\u306e\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u306b\u6210\u529f\u3057\u305f\u3001\u4ee5\u524d\u306e\u30f4\u30a1\u30fc\u30b8\u30e7\u30f3\u304c\u307e\u3060\u305d\u306e\u5834\u6240\u306b\u3042\u308b\u304b\u3089\u3067\u3059\u3002\u6ce8\u610f\u3057\u306a\u304d\u3083\u3044\u3051\u307e\u305b\u3093\u306d\uff01
\n\u3068\u3082\u304b\u304f\u3001\u53d6\u5f97\u3067\u304d\u308b\u306e\u306fString\u3067\u3059\u3002\u3067\u3082\u3001\u6b32\u3057\u3044\u306e\u306fuint\u3067\u3059\u3001\u3069\u3046\u3057\u305f\u3089\u3044\u3044\u3093\u3067\u3057\u3087\u3046\uff1f \u3075\u3080\u3001\u5b9f\u306f\u305d\u306e\u305f\u3081\u306e\u51fd\u6570\u304c\u3042\u308b\u306e\u3067\u3059\uff1a<\/p>\n
let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                       .ok<\/span>()<\/span>\r\n                       .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\nlet<\/span> input_num<\/span>:<\/span> Option<\/span><<\/span>uint<\/span>><\/span> =<\/span> from_str<\/span>(<\/span>input<\/span>.as_slice<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u3053\u306efrom_str\u51fd\u6570\u306f\u3001&str\u578b\u306e\u5024\u3092\u53d6\u308a\u3001\u305d\u308c\u3092\u4f55\u304b\u306b\u5909\u63db\u3057\u307e\u3059\u3002\u578b\u306e\u30d2\u30f3\u30c8\u3092\u4e0e\u3048\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u3069\u3093\u306a\u7a2e\u985e\u306e\u3082\u306e\u304b\u3092\u6559\u3048\u3066\u3084\u308a\u307e\u3059\u3002random()\u306e\u3068\u304d\u306e\u578b\u306e\u30d2\u30f3\u30c8\u3092\u899a\u3048\u3066\u307e\u3059\u304b\uff1f \u3053\u3093\u306a\u611f\u3058\u3067\u3057\u305f\u306d\uff1a<\/p>\n
rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>();<\/span>\r\n<\/code><\/pre>\n
\u30d2\u30f3\u30c8\u3092\u4e0e\u3048\u308b\u306e\u306b\u306f\u5225\u306e\u3084\u308a\u65b9\u3082\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u306f\u578b\u3092let\u306e\u4e2d\u3067\u5ba3\u8a00\u3059\u308b\u3068\u3044\u3046\u3082\u306e\u3067\u3059\uff1a<\/p>\n
let<\/span> x<\/span>:<\/span> uint<\/span> =<\/span> rand<\/span>::<\/span>random<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u3053\u306e\u5834\u5408\u3001x\u306fuint\u3067\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u660e\u793a\u3057\u3066\u3044\u307e\u3059\u304b\u3089\u3001Rust\u306frandom()\u304c\u4f55\u3092\u751f\u6210\u3059\u3079\u304d\u304b\u3092\u5224\u5225\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u540c\u69d8\u306b\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u3069\u3061\u3089\u306e\u3084\u308a\u65b9\u3082\u3046\u307e\u304f\u3044\u304d\u307e\u3059\uff1a<\/p>\n
let<\/span> input_num<\/span> =<\/span> from_str<\/span>::<\/span><<\/span>uint<\/span>><\/span>(<\/span>\"5\"<\/span>);<\/span>\r\nlet<\/span> input_num<\/span>:<\/span> Option<\/span><<\/span>uint<\/span>><\/span> =<\/span> from_str<\/span>(<\/span>\"5\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u3068\u3082\u3042\u308c\u3001\u5165\u529b\u3092\u6570\u5024\u306b\u5909\u63db\u3057\u305f\u308f\u3051\u306a\u306e\u3067\u3001\u30b3\u30fc\u30c9\u306f\u3053\u3046\u306a\u308a\u307e\u3059\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>()<\/span> %<\/span> 100u<\/span>)<\/span> +<\/span> 1u<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                           .ok<\/span>()<\/span>\r\n                           .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n    let<\/span> input_num<\/span>:<\/span> Option<\/span><<\/span>uint<\/span>><\/span> =<\/span> from_str<\/span>(<\/span>input<\/span>.as_slice<\/span>());<\/span>\r\n\r\n\r\n\r\n    println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> input_num<\/span>);<\/span>\r\n\r\n    match<\/span> cmp<\/span>(<\/span>input_num<\/span>,<\/span> secret_number<\/span>)<\/span> {<\/span>\r\n        Less<\/span>    =><\/span> println!<\/span>(<\/span>\"Too small!\"<\/span>),<\/span>\r\n        Greater<\/span> =><\/span> println!<\/span>(<\/span>\"Too big!\"<\/span>),<\/span>\r\n        Equal<\/span>   =><\/span> {<\/span> println!<\/span>(<\/span>\"You win!\"<\/span>);<\/span> },<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> uint<\/span>,<\/span> b<\/span>:<\/span> uint<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n
$<\/span> cargo build\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\nsrc\/main.rs:22:15: 22:24 error: mismatched types: expected `uint`\r\n<\/span>but found `core::option::Option<uint><\/span>`<\/span> (<\/span>expected uint but found enum core::option::Option)<\/span>\r\nsrc\/main.rs:22 match cmp(input_num, secret_number) {\r\n                         ^~~~~~~~~\r\nerror: aborting due to previous error\r\n<\/span><\/code><\/pre>\n
\u304a\u304a\u3001\u305d\u3046\u3067\u3057\u305f\uff01 input_num\u306fuint\u578b\u3067\u306f\u306a\u304fOption\u578b\u306a\u3093\u3067\u3057\u305f\u3002Option\u3092\u5265\u304c\u306a\u304f\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002\u3082\u3057\u524d\u306e\u3053\u3068\u3092\u899a\u3048\u3066\u3044\u308c\u3070\u3001\u305d\u308c\u306b\u306fmatch\u304c\u30d4\u30c3\u30bf\u30ea\u306a\u306e\u3067\u3057\u305f\u3002\u3053\u306e\u30b3\u30fc\u30c9\u3092\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>()<\/span> %<\/span> 100u<\/span>)<\/span> +<\/span> 1u<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                           .ok<\/span>()<\/span>\r\n                           .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n    let<\/span> input_num<\/span>:<\/span> Option<\/span><<\/span>uint<\/span>><\/span> =<\/span> from_str<\/span>(<\/span>input<\/span>.as_slice<\/span>());<\/span>\r\n\r\n    let<\/span> num<\/span> =<\/span> match<\/span> input_num<\/span> {<\/span>\r\n        Some<\/span>(<\/span>num<\/span>)<\/span> =><\/span> num<\/span>,<\/span>\r\n        None<\/span>      =><\/span> {<\/span>\r\n            println!<\/span>(<\/span>\"Please input a number!\"<\/span>);<\/span>\r\n            return<\/span>;<\/span>\r\n        }<\/span>\r\n    };<\/span>\r\n\r\n    println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> num<\/span>);<\/span>\r\n\r\n    match<\/span> cmp<\/span>(<\/span>num<\/span>,<\/span> secret_number<\/span>)<\/span> {<\/span>\r\n        Less<\/span>    =><\/span> println!<\/span>(<\/span>\"Too small!\"<\/span>),<\/span>\r\n        Greater<\/span> =><\/span> println!<\/span>(<\/span>\"Too big!\"<\/span>),<\/span>\r\n        Equal<\/span>   =><\/span> {<\/span> println!<\/span>(<\/span>\"You win!\"<\/span>);<\/span> },<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> uint<\/span>,<\/span> b<\/span>:<\/span> uint<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
match\u3092\u4f7f\u3063\u3066\u3001Option\u306e\u5185\u5074\u304b\u3089uint\u3092\u53d6\u308a\u51fa\u3059\u304b\u3001\u6216\u3044\u306f\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3057\u3066\u547c\u3073\u51fa\u3057\u5143\u306b\u623b\u308a\u307e\u3059\u3002\u3084\u3063\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> cargo run\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\n     Running `target\/guessing_game`\r\nGuess the number!\r\nThe secret number is: 17\r\nPlease input your guess.\r\n5\r\nPlease input a number!\r\n<\/span><\/code><\/pre>\n
\u3048\u3063\u3001\u306a\u306b\uff1f \u3067\u3082\u304d\u3061\u3093\u3068\u6570\u3092\u5165\u529b\u3057\u305f\u3058\u3083\u306a\u3044\u306e\uff01
\n\u2026\u2026\u5b9f\u306f\u3001\u6570\u3092\u5165\u529b\u3057\u3066\u306f\u3044\u306a\u3044\u306e\u3067\u3059\u3002stdin()\u304b\u3089\u5165\u529b\u3092\u4e00\u884c\u53d6\u5f97\u3059\u308b\u3068\u304d\u306b\u306f\u3001\u5165\u529b\u306e\u5168\u90e8\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30a8\u30f3\u30bf\u30fc\u30ad\u30fc\u3092\u62bc\u3057\u305f\u6642\u306e\\n\u6587\u5b57\u3082\u542b\u3081\u3066\u306a\u306e\u3067\u3059\u306d\u3002\u3060\u304b\u3089\u3001from_str()\u306f”5\\n”\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u898b\u3066\u3001\u300c\u3046\u3093\u306b\u3083\u3001\u3053\u308a\u3083\u6570\u3058\u3083\u306d\u3048\u3084\u306a\u3002\u6570\u3058\u3083\u306a\u3044\u3084\u3064\u304c\u305d\u3053\u306b\u306f\u3044\u3063\u3068\u308b\u3082\u3093\u306a\uff01\u300d\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002\u5e78\u3044\u306a\u3053\u3068\u306b\u3001\u3053\u3053\u3067\u5229\u7528\u3067\u304d\u308b\u4fbf\u5229\u306a\u30e1\u30bd\u30c3\u30c9trim()\u304c&str\u306b\u306f\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u3061\u3087\u3063\u3068\u3057\u305f\u4fee\u6b63\u3067\u30b3\u30fc\u30c9\u306f\u3053\u3046\u306a\u308a\u307e\u3059\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>()<\/span> %<\/span> 100u<\/span>)<\/span> +<\/span> 1u<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n    let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                           .ok<\/span>()<\/span>\r\n                           .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n    let<\/span> input_num<\/span>:<\/span> Option<\/span><<\/span>uint<\/span>><\/span> =<\/span> from_str<\/span>(<\/span>input<\/span>.as_slice<\/span>()<\/span>.trim<\/span>());<\/span>\r\n\r\n    let<\/span> num<\/span> =<\/span> match<\/span> input_num<\/span> {<\/span>\r\n        Some<\/span>(<\/span>num<\/span>)<\/span> =><\/span> num<\/span>,<\/span>\r\n        None<\/span>      =><\/span> {<\/span>\r\n            println!<\/span>(<\/span>\"Please input a number!\"<\/span>);<\/span>\r\n            return<\/span>;<\/span>\r\n        }<\/span>\r\n    };<\/span>\r\n\r\n    println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> num<\/span>);<\/span>\r\n\r\n    match<\/span> cmp<\/span>(<\/span>num<\/span>,<\/span> secret_number<\/span>)<\/span> {<\/span>\r\n        Less<\/span>    =><\/span> println!<\/span>(<\/span>\"Too small!\"<\/span>),<\/span>\r\n        Greater<\/span> =><\/span> println!<\/span>(<\/span>\"Too big!\"<\/span>),<\/span>\r\n        Equal<\/span>   =><\/span> {<\/span> println!<\/span>(<\/span>\"You win!\"<\/span>);<\/span> },<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> uint<\/span>,<\/span> b<\/span>:<\/span> uint<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n
$<\/span> cargo run\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\n     Running `target\/guessing_game`\r\nGuess the number!\r\nThe secret number is: 58\r\nPlease input your guess.\r\n  76\r\nYou guessed: 76\r\nToo big!\r\n<\/span><\/code><\/pre>\n
\u3084\u3063\u305f\u306d\uff01 \u63a8\u6e2c\u5024\u306e\u524d\u306b\u30b9\u30da\u30fc\u30b9\u3092\u4ed8\u3051\u8db3\u3057\u3066\u307f\u305f\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u3067\u308276\u3068\u3044\u3046\u63a8\u6e2c\u3092\u3057\u305f\u3053\u3068\u3092\u7406\u89e3\u3057\u3066\u304f\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f55\u56de\u304b\u5b9f\u884c\u3057\u3066\u3001\u6570\u306e\u63a8\u6e2c\u304c\u304d\u3061\u3093\u3068\u52d5\u4f5c\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u691c\u8a3c\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u6570\u304c\u5c0f\u3055\u3059\u304e\u308b\u5834\u5408\u3082\u8a66\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u306d\u3002
\nRust\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3001\u5927\u3044\u306b\u6211\u3005\u3092\u52a9\u3051\u3060\u3057\u3066\u304f\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u300c\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u3082\u305f\u308c\u304b\u304b\u308b lean on the compiler\u300d\u3068\u8a00\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u30b3\u30fc\u30c9\u306b\u53d6\u308a\u7d44\u3080\u3055\u3044\u306b\u3057\u3070\u3057\u3070\u6709\u7528\u306a\u65b9\u6cd5\u3067\u3059\u3002\u6b63\u3057\u3044\u578b\u306b\u5411\u304b\u3063\u3066\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u30d8\u30eb\u30d7\u30fb\u30ac\u30a4\u30c9\u3092\u3055\u305b\u308b\u306e\u3067\u3059\u3002
\n\u3055\u3066\u3001\u3053\u308c\u3067\u30b2\u30fc\u30e0\u306e\u6b86\u3069\u306f\u52d5\u4f5c\u3055\u305b\u3089\u308c\u307e\u3057\u305f\u304c\u3001\u3067\u3082\u63a8\u6e2c\u304c\u4e00\u56de\u3057\u304b\u3067\u304d\u307e\u305b\u3093\u306d\u3002\u30eb\u30fc\u30d7\u3092\u4ed8\u3051\u52a0\u3048\u3066\u305d\u3053\u306e\u3068\u3053\u308d\u3092\u5909\u3048\u307e\u3057\u3087\u3046\uff01<\/p>\n
14.5. \u30eb\u30fc\u30d7\u51e6\u7406<\/h2>\n
\u65e2\u306b\u304a\u8a71\u3057\u305f\u3088\u3046\u306b\u3001loop\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u3048\u3070\u7121\u9650\u30eb\u30fc\u30d7\u304c\u3067\u304d\u307e\u3059\u3002\u306a\u306e\u3067\u3001\u305d\u308c\u3092\u4ed8\u3051\u8db3\u3057\u307e\u3057\u3087\u3046\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>()<\/span> %<\/span> 100u<\/span>)<\/span> +<\/span> 1u<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    loop<\/span> {<\/span>\r\n\r\n        println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n        let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                           .ok<\/span>()<\/span>\r\n                           .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n        let<\/span> input_num<\/span>:<\/span> Option<\/span><<\/span>uint<\/span>><\/span> =<\/span> from_str<\/span>(<\/span>input<\/span>.as_slice<\/span>()<\/span>.trim<\/span>());<\/span>\r\n\r\n        let<\/span> num<\/span> =<\/span> match<\/span> input_num<\/span> {<\/span>\r\n            Some<\/span>(<\/span>num<\/span>)<\/span> =><\/span> num<\/span>,<\/span>\r\n            None<\/span>      =><\/span> {<\/span>\r\n                println!<\/span>(<\/span>\"Please input a number!\"<\/span>);<\/span>\r\n                return<\/span>;<\/span>\r\n            }<\/span>\r\n        };<\/span>\r\n\r\n\r\n        println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> num<\/span>);<\/span>\r\n\r\n        match<\/span> cmp<\/span>(<\/span>num<\/span>,<\/span> secret_number<\/span>)<\/span> {<\/span>\r\n            Less<\/span>    =><\/span> println!<\/span>(<\/span>\"Too small!\"<\/span>),<\/span>\r\n            Greater<\/span> =><\/span> println!<\/span>(<\/span>\"Too big!\"<\/span>),<\/span>\r\n            Equal<\/span>   =><\/span> {<\/span> println!<\/span>(<\/span>\"You win!\"<\/span>);<\/span> },<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> uint<\/span>,<\/span> b<\/span>:<\/span> uint<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3055\u3066\u3001\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u3067\u3082\u5f85\u3063\u3066\u3001\u5358\u306b\u7121\u9650\u30eb\u30fc\u30d7\u3092\u4ed8\u3051\u52a0\u3048\u305f\u3060\u3051\u306a\u3093\u3058\u3083\u306a\u3044\u306e\uff1f \u3046\u3093\u3002return\u3092\u4ed8\u3051\u52a0\u3048\u305f\u306e\u3092\u899a\u3048\u3066\u307e\u3059\u304b\uff1f \u3082\u3057\u6570\u5024\u3067\u306a\u3044\u7b54\u3048\u3092\u5165\u308c\u308b\u3068\u3001return\u3057\u3066\u3001\u7d42\u4e86\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u898b\u3066\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n
$<\/span> cargo run\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\n     Running `target\/guessing_game`\r\nGuess the number!\r\nThe secret number is: 59\r\nPlease input your guess.\r\n45\r\nYou guessed: 45\r\nToo small!\r\nPlease input your guess.\r\n60\r\nYou guessed: 60\r\nToo big!\r\nPlease input your guess.\r\n59\r\nYou guessed: 59\r\nYou win!\r\nPlease input your guess.\r\nquit\r\nPlease input a number!\r\n<\/span><\/code><\/pre>\n
\u306f\u306f\u306f\uff01 quit\u3068\u5165\u529b\u3057\u305f\u3089\u672c\u5f53\u306b\u7d42\u4e86\u3057\u307e\u3057\u305f\u3088\u3002\u307e\u3042\u3001\u4ed6\u306e\u3069\u3093\u306a\u975e\u6570\u5024\u306a\u5165\u529b\u3067\u3082\u305d\u3046\u306a\u3093\u3067\u3059\u3051\u3069\u306d\u3002\u3075\u3080\u3001\u3053\u308c\u306f\u63a7\u3048\u3081\u306b\u8a00\u3063\u3066\u3082\u5b8c\u5168\u3068\u306f\u3044\u3048\u307e\u305b\u3093\u306d\u3002\u307e\u305a\u3001\u30b2\u30fc\u30e0\u306b\u52dd\u3063\u305f\u3089\u5b9f\u969b\u306b\u305d\u3053\u3067\u7d42\u4e86\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>()<\/span> %<\/span> 100u<\/span>)<\/span> +<\/span> 1u<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    loop<\/span> {<\/span>\r\n\r\n        println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n        let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                               .ok<\/span>()<\/span>\r\n                               .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n        let<\/span> input_num<\/span>:<\/span> Option<\/span><<\/span>uint<\/span>><\/span> =<\/span> from_str<\/span>(<\/span>input<\/span>.as_slice<\/span>()<\/span>.trim<\/span>());<\/span>\r\n\r\n        let<\/span> num<\/span> =<\/span> match<\/span> input_num<\/span> {<\/span>\r\n            Some<\/span>(<\/span>num<\/span>)<\/span> =><\/span> num<\/span>,<\/span>\r\n            None<\/span>      =><\/span> {<\/span>\r\n                println!<\/span>(<\/span>\"Please input a number!\"<\/span>);<\/span>\r\n                return<\/span>;<\/span>\r\n            }<\/span>\r\n        };<\/span>\r\n\r\n\r\n        println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> num<\/span>);<\/span>\r\n\r\n        match<\/span> cmp<\/span>(<\/span>num<\/span>,<\/span> secret_number<\/span>)<\/span> {<\/span>\r\n            Less<\/span>    =><\/span> println!<\/span>(<\/span>\"Too small!\"<\/span>),<\/span>\r\n            Greater<\/span> =><\/span> println!<\/span>(<\/span>\"Too big!\"<\/span>),<\/span>\r\n            Equal<\/span>   =><\/span> {<\/span>\r\n                println!<\/span>(<\/span>\"You win!\"<\/span>);<\/span>\r\n                return<\/span>;<\/span>\r\n            },<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> uint<\/span>,<\/span> b<\/span>:<\/span> uint<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
You win!\u306e\u5f8c\u306breturn\u3092\u4ed8\u3051\u8db3\u305b\u3070\u3001\u52dd\u3063\u305f\u6642\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d42\u4e86\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u3060\u3082\u3046\u3072\u3068\u3072\u306d\u308a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u3082\u3057\u975e\u6570\u5024\u304c\u5165\u529b\u3055\u308c\u305f\u3068\u304d\u306b\u3001\u7d42\u4e86\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3066\u5358\u306b\u305d\u308c\u3092\u7121\u8996\u3057\u305f\u3044\u306e\u3067\u3059\u3002\u305d\u3053\u306e\u3068\u3053\u308d\u306ereturn\u3092continue\u306b\u5909\u66f4\u3057\u307e\u3057\u3087\u3046\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>()<\/span> %<\/span> 100u<\/span>)<\/span> +<\/span> 1u<\/span>;<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The secret number is: {}\"<\/span>,<\/span> secret_number<\/span>);<\/span>\r\n\r\n    loop<\/span> {<\/span>\r\n\r\n        println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n        let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                               .ok<\/span>()<\/span>\r\n                               .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n         let<\/span> input_num<\/span>:<\/span> Option<\/span><<\/span>uint<\/span>><\/span> =<\/span> from_str<\/span>(<\/span>input<\/span>.as_slice<\/span>()<\/span>.trim<\/span>());<\/span>\r\n\r\n        let<\/span> num<\/span> =<\/span> match<\/span> input_num<\/span> {<\/span>\r\n            Some<\/span>(<\/span>num<\/span>)<\/span> =><\/span> num<\/span>,<\/span>\r\n            None<\/span>      =><\/span> {<\/span>\r\n                println!<\/span>(<\/span>\"Please input a number!\"<\/span>);<\/span>\r\n                continue<\/span>;<\/span>\r\n            }<\/span>\r\n        };<\/span>\r\n\r\n\r\n        println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> num<\/span>);<\/span>\r\n\r\n        match<\/span> cmp<\/span>(<\/span>num<\/span>,<\/span> secret_number<\/span>)<\/span> {<\/span>\r\n            Less<\/span>    =><\/span> println!<\/span>(<\/span>\"Too small!\"<\/span>),<\/span>\r\n            Greater<\/span> =><\/span> println!<\/span>(<\/span>\"Too big!\"<\/span>),<\/span>\r\n            Equal<\/span>   =><\/span> {<\/span>\r\n                println!<\/span>(<\/span>\"You win!\"<\/span>);<\/span>\r\n                return<\/span>;<\/span>\r\n            },<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> uint<\/span>,<\/span> b<\/span>:<\/span> uint<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3067\u3044\u3044\u306f\u305a\u3067\u3059\uff01 \u3084\u3063\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
$<\/span> cargo run\r\n   Compiling guessing_game v0.0.1 (file:\/\/\/home\/you\/projects\/guessing_game)\r\n     Running `target\/guessing_game`\r\nGuess the number!\r\nThe secret number is: 61\r\nPlease input your guess.\r\n10\r\nYou guessed: 10\r\nToo small!\r\nPlease input your guess.\r\n99\r\nYou guessed: 99\r\nToo big!\r\nPlease input your guess.\r\nfoo\r\nPlease input a number!\r\nPlease input your guess.\r\n61\r\nYou guessed: 61\r\nYou win!\r\n<\/span><\/code><\/pre>\n
\u30de\u30b8\u3059\u3052\u3048\uff01 \u3042\u3068\u6700\u5f8c\u307b\u3093\u306e\u3072\u3068\u3072\u306d\u308a\u3067\u3001\u6570\u5f53\u3066\u30b2\u30fc\u30e0\u306f\u5b8c\u6210\u3067\u3059\u3002\u306a\u3093\u306e\u3053\u3068\u304b\u308f\u304b\u308a\u307e\u3059\u304b\uff1f \u305d\u3046\u3067\u3059\u3001\u305d\u306e\u901a\u308a\u3002\u79d8\u5bc6\u306e\u6570\u3092\u8868\u793a\u3057\u305f\u304f\u306f\u306a\u3044\u3067\u3059\u3088\u306d\u3002\u30c6\u30b9\u30c8\u3059\u308b\u306b\u306f\u7d50\u69cb\u3067\u3057\u305f\u304c\u3001\u304a\u852d\u3067\u30b2\u30fc\u30e0\u306f\u53f0\u7121\u3057\u306a\u611f\u3058\u3067\u3059\u3002\u3068\u3044\u3046\u308f\u3051\u3067\u3053\u308c\u304c\u6700\u7d42\u7684\u306a\u30bd\u30fc\u30b9\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n
use<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>rand<\/span>;<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Guess the number!\"<\/span>);<\/span>\r\n\r\n    let<\/span> secret_number<\/span> =<\/span> (<\/span>rand<\/span>::<\/span>random<\/span>::<\/span><<\/span>uint<\/span>><\/span>()<\/span> %<\/span> 100u<\/span>)<\/span> +<\/span> 1u<\/span>;<\/span>\r\n\r\n    loop<\/span> {<\/span>\r\n\r\n        println!<\/span>(<\/span>\"Please input your guess.\"<\/span>);<\/span>\r\n\r\n        let<\/span> input<\/span> =<\/span> io<\/span>::<\/span>stdin<\/span>()<\/span>.read_line<\/span>()<\/span>\r\n                               .ok<\/span>()<\/span>\r\n                               .expect<\/span>(<\/span>\"Failed to read line\"<\/span>);<\/span>\r\n        let<\/span> input_num<\/span>:<\/span> Option<\/span><<\/span>uint<\/span>><\/span> =<\/span> from_str<\/span>(<\/span>input<\/span>.as_slice<\/span>()<\/span>.trim<\/span>());<\/span>\r\n\r\n        let<\/span> num<\/span> =<\/span> match<\/span> input_num<\/span> {<\/span>\r\n            Some<\/span>(<\/span>num<\/span>)<\/span> =><\/span> num<\/span>,<\/span>\r\n            None<\/span>      =><\/span> {<\/span>\r\n                println!<\/span>(<\/span>\"Please input a number!\"<\/span>);<\/span>\r\n                continue<\/span>;<\/span>\r\n            }<\/span>\r\n        };<\/span>\r\n\r\n\r\n        println!<\/span>(<\/span>\"You guessed: {}\"<\/span>,<\/span> num<\/span>);<\/span>\r\n\r\n        match<\/span> cmp<\/span>(<\/span>num<\/span>,<\/span> secret_number<\/span>)<\/span> {<\/span>\r\n            Less<\/span>    =><\/span> println!<\/span>(<\/span>\"Too small!\"<\/span>),<\/span>\r\n            Greater<\/span> =><\/span> println!<\/span>(<\/span>\"Too big!\"<\/span>),<\/span>\r\n            Equal<\/span>   =><\/span> {<\/span>\r\n                println!<\/span>(<\/span>\"You win!\"<\/span>);<\/span>\r\n                return<\/span>;<\/span>\r\n            },<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> cmp<\/span>(<\/span>a<\/span>:<\/span> uint<\/span>,<\/span> b<\/span>:<\/span> uint<\/span>)<\/span> -><\/span> Ordering<\/span> {<\/span>\r\n    if<\/span> a<\/span> <<\/span> b<\/span> {<\/span> Less<\/span> }<\/span>\r\n    else<\/span> if<\/span> a<\/span> ><\/span> b<\/span> {<\/span> Greater<\/span> }<\/span>\r\n    else<\/span> {<\/span> Equal<\/span> }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
14.6. \u5b8c\u6210\uff01<\/h2>\n
\u3053\u308c\u3067\u3001\u307f\u306a\u3055\u3093\u306f\u300c\u6570\u5f53\u3066\u30b2\u30fc\u30e0\u300d\u3092\u7121\u4e8b\u30d3\u30eb\u30c9\u3059\u308b\u306e\u306b\u6210\u529f\u3057\u307e\u3057\u305f\uff01 \u304a\u3081\u3067\u3068\u3046\u3054\u3056\u3044\u307e\u3059\uff01
\n\u3044\u307e\u3084Rust\u306e\u57fa\u672c\u7684\u69cb\u6587\u306f\u5b66\u3093\u3067\u3057\u307e\u3063\u305f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u307e\u3067\u306e\u3068\u3053\u308d\u306f\u3069\u308c\u3082\u3001\u307f\u306a\u3055\u3093\u304c\u904e\u53bb\u306b\u4f7f\u3063\u305f\u3053\u3068\u306e\u3042\u308b\u69d8\u3005\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u6bd4\u8f03\u7684\u4f3c\u901a\u3063\u3066\u3044\u305f\u3067\u3057\u3087\u3046\u3002\u3053\u308c\u3089\u306e\u6839\u672c\u7684\u306a\u69cb\u6587\u7684\u30fb\u610f\u5473\u8ad6\u7684\u8981\u7d20\u304c\u6b8b\u308a\u306eRust\u5b66\u7fd2\u306e\u57fa\u76e4\u306b\u306a\u308a\u307e\u3059\u3002
\n\u3055\u3066\u3001\u3053\u308c\u3067\u57fa\u790e\u306f\u30de\u30b9\u30bf\u30fc\u3057\u305f\u308f\u3051\u3067\u3059\u304b\u3089\u3001Rust\u306e\u3082\u3063\u3068\u30e6\u30cb\u30fc\u30af\u306a\u6a5f\u80fd\u306b\u3064\u3044\u3066\u5b66\u3076\u6642\u304c\u6765\u307e\u3057\u305f\u3002<\/p>\n
\n
\u539f\u6587\u306e\u8457\u4f5c\u6a29\u30e9\u30a4\u30bb\u30f3\u30b9\u306f\u4e0b\u8a18\u306e\u3068\u304a\u308a\u3067\u3059\u3002
\n\u307e\u305f\u3001\u3053\u306e\u65e5\u672c\u8a9e\u8a33\u306fApache License, version 2.0\u306b\u62e0\u308a\u307e\u3059\u3002<\/p>\n
Copyright \u00a9 2011-2014 The Rust Project Developers.
\nLicensed under the Apache License, Version 2.0 or the MIT license,
\nat your option.<\/p>\n
This file may not be copied, modified, or distributed except
\naccording to those terms.<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"
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