{"id":44887,"date":"2023-10-26T22:08:56","date_gmt":"2023-05-03T00:18:49","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/44887-2\/"},"modified":"2024-05-04T06:09:16","modified_gmt":"2024-05-03T22:09:16","slug":"44887-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/44887-2\/","title":{"rendered":""},"content":{"rendered":"

\u306f\u3058\u3081\u306b<\/h1>\n

\u6700\u8fd1\u3001Rust\u3092\u52c9\u5f37\u3059\u308b\u3068\u826f\u3044\u3068\u5148\u8f29\u306b\u6559\u3048\u3066\u3082\u3089\u3063\u305f\u306e\u3067\u3001\u52c9\u5f37\u3092\u59cb\u3081\u3066\u307f\u307e\u3057\u305f\u3002\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304c\u7d50\u69cb\u9577\u3044\u306e\u3067\u3001\u5099\u5fd8\u9332\u3068\u3057\u3066\u6295\u7a3f\u3057\u3088\u3046\u3068\u601d\u3044\u307e\u3059\u3002\u3064\u3044\u3067\u306b\u3001\u8ab0\u304bRust\u3092\u521d\u3081\u3066\u52c9\u5f37\u3057\u3088\u3046\u3068\u8a00\u3046\u4eba\u304c\u3044\u308c\u3070\u3001\u53c2\u8003\u306b\u306a\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n

\u52c9\u5f37\u4e2d\u306a\u306e\u3067\u3001\u5c11\u3057\u305a\u3064\u8a18\u4e8b\u3092\u66f4\u65b0\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

Rust\u3068\u306f<\/h1>\n

Rust\u306f\u4fe1\u983c\u6027\u304c\u9ad8\u304f\u9ad8\u901f\u306a\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u69cb\u7bc9\u3059\u308b\u3053\u3068\u304c\u5bb9\u6613\u306b\u3067\u304d\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3042\u308b\u3002\u30e9\u30f3\u30bf\u30a4\u30e0\u3084\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u308f\u305a\u306b\u3001\u9ad8\u901f\u3067\u30e1\u30e2\u30ea\u306e\u5b89\u5168\u6027\u3082\u78ba\u4fdd\u3067\u304d\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u4ed6\u306e\u8a00\u8a9e\u3068\u306e\u7d71\u5408\u3082\u5bb9\u6613\u3067\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u91cd\u8981\u306a\u30b5\u30fc\u30d3\u30b9\u3084\u7d44\u307f\u8fbc\u307f\u30b7\u30b9\u30c6\u30e0\u306e\u69cb\u7bc9\u306b\u5229\u7528\u3067\u304d\u308b\u3002<\/p>\n

\u5909\u6570\u3084\u5b9a\u6570<\/h1>\n

let<\/h2>\n

Rust\u306e\u5909\u6570\u306flet\u3067\u5ba3\u8a00\u3067\u304d\u308b\u3002\u578b\u306f\u6307\u5b9a\u3057\u3066\u3082\u3057\u306a\u304f\u3066\u3082\u826f\u3044\u3002<\/p>\n

fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 5<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"The value of x is {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n    let<\/span> y<\/span>:<\/span> u32<\/span> =<\/span> 100<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"The value of y is {}\"<\/span>,<\/span> y<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
let\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306f\u305d\u306e\u30b9\u30b3\u30fc\u30d7\u5185\u3067\u306e\u307f\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u307e\u305fJavascript\u306a\u3069\u3068\u306f\u9055\u3044\u3001let\u306e\u307f\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306f\u5024\u3092\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u305a\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u305f\u6642\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u304c\u51fa\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 5<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"The value of x is: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n    x<\/span> =<\/span> 6<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"The value of x is: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
$ <\/span>cargo run\r\n   Compiling variables v0.1.0 (<\/span>file:\/\/\/projects\/variables)<\/span>\r\nerror[E0384]: cannot assign twice to immutable variable `<\/span>x`<\/span>\r\n --<\/span>><\/span> src\/main.rs:4:5\r\n  |\r\n2 |     let <\/span>x =<\/span> 5;<\/span>\r\n  |         -\r\n  |         |\r\n  |         first assignment to `<\/span>x`<\/span>\r\n  |         help<\/span>: consider making this binding mutable: `<\/span>mut x`<\/span>\r\n3 |     println!(<\/span>\"The value of x is: {}\"<\/span>, x)<\/span>;<\/span>\r\n4 |     x =<\/span> 6;<\/span>\r\n  |     ^^^^^ cannot assign twice to immutable variable\r\n\r\nFor more information about this error, try `<\/span>rustc --explain<\/span> E0384`<\/span>.<\/span>\r\nerror: could not compile `<\/span>variables`<\/span> due to previous error\r\n<\/code><\/pre>\n
\u5024\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u6642\u306fmut\u3092\u4e00\u7dd2\u306b\u4f7f\u3046\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> x<\/span> =<\/span> 5<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"The value of x is: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n    x<\/span> =<\/span> 6<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"The value of x is: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30b7\u30e3\u30c9\u30fc\u30a4\u30f3\u30b0<\/h3>\n
\u5909\u6570\u306f\u540c\u3058\u540d\u524d\u3067\u3001\u578b\u3092\u5909\u3048\u3066\u3082\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u524d\u306b\u793a\u3057\u305f\u3088\u3046\u306b\u3001\u5909\u6570\u306f\u5ba3\u8a00\u3057\u305f\u30b9\u30b3\u30fc\u30d7\u5185\u3067\u306e\u307f\u5229\u7528\u3067\u304d\u308b\u306e\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5b9f\u884c\u7d50\u679c\u306b\u306a\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 5<\/span>;<\/span>\r\n    let<\/span> x<\/span> =<\/span> x<\/span> +<\/span> 1<\/span>;<\/span>\r\n    {<\/span>\r\n        let<\/span> x<\/span> =<\/span> x<\/span> *<\/span> 2<\/span>;<\/span>\r\n        println!<\/span>(<\/span>\"The value of x in the inner scope is: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n    }<\/span>\r\n    println!<\/span>(<\/span>\"The value of x is: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
$ <\/span>cargo run\r\n   Compiling variables v0.1.0 (<\/span>file:\/\/\/projects\/variables)<\/span>\r\n    Finished dev [<\/span>unoptimized + debuginfo] target(<\/span>s)<\/span> in <\/span>0.31s\r\n     Running `<\/span>target\/debug\/variables`<\/span>\r\nThe value of x in <\/span>the inner scope is: 12\r\nThe value of x is: 6\r\n<\/code><\/pre>\n
\u30b7\u30e3\u30c9\u30fc\u30a4\u30f3\u30b0\u3092\u3059\u308b\u3068\u3001Rust\u306f\u65b0\u3057\u304f\u30e1\u30e2\u30ea\u3092\u78ba\u4fdd\u3059\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> x<\/span> =<\/span> \"test1\"<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"{0}: {1:p}\"<\/span>,<\/span> x<\/span>,<\/span> &<\/span>x<\/span>);<\/span>\r\n    x<\/span> =<\/span> \"test2\"<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"{0}: {1:p}\"<\/span>,<\/span> x<\/span>,<\/span> &<\/span>x<\/span>);<\/span>\r\n    let<\/span> x<\/span> =<\/span> \"test3\"<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"{0}: {1:p}\"<\/span>,<\/span> x<\/span>,<\/span> &<\/span>x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
$ <\/span>cargo run\r\n   Compiling playground v0.0.1 (<\/span>\/playground)<\/span>\r\n    Finished dev [<\/span>unoptimized + debuginfo] target(<\/span>s)<\/span> in <\/span>1.09s\r\n     Running `<\/span>target\/debug\/playground`<\/span>\r\ntest1: 0x7ffd5fe1c790\r\ntest2: 0x7ffd5fe1c790\r\ntest3: 0x7ffd5fe1c850\r\n<\/code><\/pre>\n
const<\/h2>\n
\u5b9a\u6570\u3092\u5ba3\u8a00\u3059\u308b\u3068\u304d\u306f\u3001\u578b\u3092\u6307\u5b9a\u3057\u3066const\u3092\u4f7f\u3046\u3002\u4ed6\u306e\u8a00\u8a9e\u3068\u540c\u3058\u3088\u3046\u306b\u3001\u5024\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3002Rust\u306e\u6163\u7fd2\u3068\u3057\u3066\u3001\u5b9a\u6570\u540d\u306f\u5168\u3066\u5927\u6587\u5b57\u3067\u5358\u8a9e\u306e\u533a\u5207\u308a\u306f\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc\uff08_\uff09\u3067\u5ba3\u8a00\u3059\u308b\u3002\u5b9a\u6570\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u30b9\u30b3\u30fc\u30d7\u3092\u542b\u3081\u3066\u3059\u3079\u3066\u306e\u5834\u6240\u3067\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u305d\u306e\u30b9\u30b3\u30fc\u30d7\u5185\u3067\u306e\u307f\u5229\u7528\u53ef\u80fd\u3067\u3042\u308b\u3002<\/p>\n
const<\/span> THREE_HOURS_IN_SECONDS<\/span>:<\/span> u32<\/span> =<\/span> 60<\/span> *<\/span> 60<\/span> *<\/span> 3<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5b9a\u6570\u306f\u4ee5\u4e0b\u306e\u70b9\u3067\u5909\u66f4\u4e0d\u53ef\u80fd\u306a\u5909\u6570\u3068\u7570\u306a\u308b\u3002<\/p>\n
mut\u3092\u4f7f\u3048\u306a\u3044
\n\u578b\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b
\n\u3069\u3053\u3067\u3082\u5ba3\u8a00\u3067\u304d\u308b
\n\u3044\u3064\u5b9f\u884c\u3057\u3066\u3082\u5024\u306f\u540c\u3058
\n\u540c\u3058\u540d\u524d\u3067\u5ba3\u8a00\u3067\u304d\u306a\u3044\uff08\u30b7\u30e3\u30c9\u30fc\u30a4\u30f3\u30b0\u3067\u304d\u306a\u3044\uff09<\/p>\n
\u30c7\u30fc\u30bf\u578b<\/h1>\n
\u5909\u6570\u306f\u901a\u5e38\u3001\u578b\u3092\u6307\u5b9a\u3057\u306a\u304f\u3066\u3082\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u63a8\u6e2c\u3057\u3066\u304f\u308c\u308b\u304c\u3001\u6587\u5b57\u5217\u304b\u3089\u6570\u5024\u3078\u306e\u5909\u63db\u306a\u3069\u3001\u8907\u6570\u306e\u578b\u304c\u4e88\u60f3\u3067\u304d\u308b\u5834\u9762\u3067\u306f\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n
let<\/span> guess<\/span>:<\/span> u32<\/span> =<\/span> \"42\"<\/span>.parse<\/span>()<\/span>.expect<\/span>(<\/span>\"Not a number!\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u3053\u3053\u3067\u578b\u3092\u6307\u5b9a\u3057\u306a\u3044\u3067\u5b9f\u884c\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3002<\/p>\n
$ <\/span>cargo run\r\n   Compiling playground v0.0.1 (<\/span>\/playground)<\/span>\r\nerror[E0282]: type <\/span>annotations needed\r\n --<\/span>><\/span> src\/main.rs:2:9\r\n  |\r\n2 |     let <\/span>guess =<\/span> \"42\"<\/span>.parse()<\/span>.expect(<\/span>\"Not a number!\"<\/span>)<\/span>;<\/span>\r\n  |         ^^^^^ consider giving `<\/span>guess`<\/span> a type\r\n\r\n<\/span>For more information about this error, try `<\/span>rustc --explain<\/span> E0282`<\/span>.<\/span>\r\nerror: could not compile `<\/span>playground`<\/span> due to previous error\r\n<\/code><\/pre>\n
\u30b9\u30ab\u30e9\u30fc<\/h2>\n
\u30b9\u30ab\u30e9\u30fc\u578b\u306f\u5927\u304d\u304f\u5206\u3051\u3066\u3001\u6574\u6570\uff0c\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\uff0c\u30d6\u30fc\u30eb\uff0c\u6587\u5b57\u306e\uff14\u7a2e\u985e\u304c\u3042\u308b\u3002<\/p>\n
\u6574\u6570<\/h3>\n
\u6574\u6570\u306b\u306f\u4ee5\u4e0b\u306e\u8868\u306b\u793a\u3059\u578b\u3092\u4f7f\u3048\u308b\u3002\u578b\u6307\u5b9a\u3092\u3057\u306a\u3044\u3068\u304d\u306e\u578b\u306fi32\u3068\u306a\u308b\u3002<\/p>\n
\n
LengthSignedUnsigned8-biti8<\/code>u8<\/code>16-biti16<\/code>u16<\/code>32-biti32<\/code>u32<\/code>64-biti64<\/code>u64<\/code>128-biti128<\/code>u128<\/code>archisize<\/code>usize<\/code><\/div>\n<\/div>\n
isize\u3068usize\u306f\u5229\u7528\u3057\u3066\u3044\u308bCPU\u306e\u6027\u80fd\u306b\u4f9d\u5b58\u3057\u300132bit\u7248\u306a\u308932bit\u300164bit\u7248\u306a\u308964bit\u306b\u306a\u308b\u3002<\/p>\n
52u32\u306a\u3069\u6570\u5024\u306e\u5f8c\u306b\u578b\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3002\u307e\u305f\u3001100\u4e07\u306a\u30891_000_000\u306a\u3069\u3001\u8aad\u307f\u6613\u3044\u3088\u3046\u306b\u6574\u6570\u3092\u533a\u5207\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3002\u4ed6\u306b\u3082\u4ee5\u4e0b\u306e\u8868\u306e\u3088\u3046\u306b\u6574\u6570\u3092\u8868\u73fe\u3067\u304d\u308b\u3002<\/p>\n
\n
Number literalsExample10\u9032\u657098_222<\/code>16\u9032\u65700xff<\/code>8\u9032\u65700o77<\/code>2\u9032\u65700b1111_0000<\/code>\u30d0\u30a4\u30c8 (u8<\/code>\u306e\u307f)b'A'<\/code><\/div>\n<\/div>\n
\u8a08\u7b97\u3057\u305f\u7d50\u679c\u304c\u30b5\u30a4\u30ba\u3092\u8d85\u3048\u308b\u3068\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3002\u3053\u306e\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3092\u6271\u3046\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\uff08\u8a73\u3057\u304f\u306fu32\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u53c2\u7167\uff09\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span>:<\/span> u8<\/span> =<\/span> 255<\/span>;<\/span>\r\n    \/\/\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u3053\u308b\u3068\u30e9\u30c3\u30d4\u30f3\u30b0\u3055\u308c\u308b<\/span>\r\n    println!<\/span>(<\/span>\"x: {:?}\"<\/span>,<\/span> x<\/span>.wrapping_add<\/span>(<\/span>1<\/span>));<\/span>\r\n    \/\/\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u3053\u308b\u3068None\u304c\u8fd4\u308b<\/span>\r\n    println!<\/span>(<\/span>\"x: {:?}\"<\/span>,<\/span> x<\/span>.checked_add<\/span>(<\/span>1<\/span>));<\/span>\r\n    \/\/\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u3053\u308b\u3068\u30e9\u30c3\u30d4\u30f3\u30b0\u3055\u308c\u305f\u5024\u3068true\u306e\u30bf\u30d7\u30eb\u304c\u8fd4\u308b<\/span>\r\n    println!<\/span>(<\/span>\"x: {:?}\"<\/span>,<\/span> x<\/span>.overflowing_add<\/span>(<\/span>1<\/span>));<\/span>\r\n    \/\/\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u8d77\u3053\u308b\u3068\u5883\u754c\u5024\u304c\u8fd4\u308b<\/span>\r\n    println!<\/span>(<\/span>\"x: {:?}\"<\/span>,<\/span> x<\/span>.saturating_add<\/span>(<\/span>1<\/span>));<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
$ <\/span>cargo run\r\n   Compiling playground v0.0.1 (<\/span>\/playground)<\/span>\r\n    Finished dev [<\/span>unoptimized + debuginfo] target(<\/span>s)<\/span> in <\/span>1.07s\r\n     Running `<\/span>target\/debug\/playground`<\/span>\r\nx: 0\r\nx: None\r\nx: (<\/span>0, true<\/span>)<\/span>\r\nx: 255\r\n<\/code><\/pre>\n
\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570<\/h3>\n
Rust\u306b\u306ff32\u3068f64\u306e\uff12\u7a2e\u985e\u306e\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u578b\u304c\u3042\u308a\u3001\u305d\u308c\u305e\u308c32\u30d3\u30c3\u30c8\u306864\u30d3\u30c3\u30c8\u306e\u30b5\u30a4\u30ba\u306b\u306a\u308b\u306e\u3067\u3001f64\u306e\u65b9\u304c\u7cbe\u5ea6\u304c\u9ad8\u3044\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306ff64\u306b\u306a\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> 2.0<\/span>;<\/span> \/\/ f64<\/span>\r\n    let<\/span> y<\/span>:<\/span> f32<\/span> =<\/span> 3.0<\/span>;<\/span> \/\/ f32<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u56db\u5247\u6f14\u7b97<\/h3>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    \/\/ \u52a0\u7b97<\/span>\r\n    let<\/span> sum<\/span> =<\/span> 5<\/span> +<\/span> 10<\/span>;<\/span>\r\n\r\n    \/\/ \u6e1b\u7b97<\/span>\r\n    let<\/span> difference<\/span> =<\/span> 95.5<\/span> -<\/span> 4.3<\/span>;<\/span>\r\n\r\n    \/\/ \u7a4d\u7b97<\/span>\r\n    let<\/span> product<\/span> =<\/span> 4<\/span> *<\/span> 30<\/span>;<\/span>\r\n\r\n    \/\/ \u9664\u7b97<\/span>\r\n    let<\/span> quotient<\/span> =<\/span> 56.7<\/span> \/<\/span> 32.2<\/span>;<\/span>\r\n    let<\/span> floored<\/span> =<\/span> 2<\/span> \/<\/span> 3<\/span>;<\/span> \/\/ \u7d50\u679c\u306f0<\/span>\r\n\r\n    \/\/ \u5270\u4f59<\/span>\r\n    let<\/span> remainder<\/span> =<\/span> 43<\/span> %<\/span> 5<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30d6\u30fc\u30eb<\/h3>\n
\u30d6\u30fc\u30eb\u578bbool\u306ftrue\u307e\u305f\u306ffalse\u306e\u5024\u3092\u53d6\u308a\u3001\u30b5\u30a4\u30ba\u306f1\u30d0\u30a4\u30c8\u306b\u306a\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> t<\/span> =<\/span> true<\/span>;<\/span>\r\n    let<\/span> f<\/span>:<\/span> bool<\/span> =<\/span> false<\/span>;<\/span> \/\/ with explicit type annotation<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6587\u5b57<\/h3>\n
\u6587\u5b57\u578bchar\u306f4\u30d0\u30a4\u30c8\u3067\u30e6\u30cb\u30b3\u30fc\u30c9\u6587\u5b57\u3092\u4e00\u3064\u4fdd\u6301\u3057\u3001\u8868\u3059\u3068\u304d\u306f\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3046\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> c<\/span> =<\/span> 'z'<\/span>;<\/span>\r\n    let<\/span> z<\/span> =<\/span> '\u2124'<\/span>;<\/span>\r\n    let<\/span> heart_eyed_cat<\/span> =<\/span> '?'<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8907\u5408\u578b<\/h2>\n
\u8907\u6570\u306e\u5024\u3092\u4e00\u3064\u306e\u578b\u306b\u30b0\u30eb\u30fc\u30d7\u5316\u3067\u304d\u308b\u3002Rust\u306b\u306f\u30bf\u30d7\u30eb\u3068\u914d\u5217\u306e\uff12\u7a2e\u985e\u3042\u308b\u3002<\/p>\n
\u30bf\u30d7\u30eb<\/h3>\n
\u30bf\u30d7\u30eb\u306f\u8907\u6570\u306e\u30c7\u30fc\u30bf\u578b\u306e\u3001\u8907\u6570\u306e\u5024\u3092\u4e00\u3064\u306b\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u4e00\u5ea6\u5ba3\u8a00\u3055\u308c\u308b\u3068\u9577\u3055\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u305a\u3001\u8981\u7d20\u306e\u524a\u9664\u3084\u8ffd\u52a0\u306f\u3067\u304d\u306a\u3044\u3002\u30bf\u30d7\u30eb\u306e\u5ba3\u8a00\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> tup<\/span>:<\/span> (<\/span>i32<\/span>,<\/span> f64<\/span>,<\/span> u8<\/span>)<\/span> =<\/span> (<\/span>500<\/span>,<\/span> 6.4<\/span>,<\/span> 1<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4e0a\u306e\u4f8b\u3067\u306f\u30c7\u30fc\u30bf\u578b\u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\u304c\u3001\u6307\u5b9a\u3057\u306a\u304f\u3066\u3082\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
Rust\u3067\u306f\u4ee5\u4e0b\u306e\u4f8b\u306e\u3088\u3046\u306b\u3001\u30bf\u30d7\u30eb\u306e\u5404\u5024\u3092\u5225\u3005\u306e\u5909\u6570\u306b\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u308b\uff08\u975e\u69cb\u9020\u5316\uff09\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> tup<\/span> =<\/span> (<\/span>500<\/span>,<\/span> 6.4<\/span>,<\/span> 1<\/span>);<\/span>\r\n    let<\/span> (<\/span>x<\/span>,<\/span> y<\/span>,<\/span> z<\/span>)<\/span> =<\/span> tup<\/span>;<\/span>\r\n    println!<\/span>(<\/span>\"The value of y is: {}\"<\/span>,<\/span> y<\/span>);<\/span> \/\/6.4<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30bf\u30d7\u30eb\u306e\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3068\u304d\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30d4\u30ea\u30aa\u30c9\uff08.\uff09\u3092\u5229\u7528\u3057\u3066\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6307\u5b9a\u3059\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span>:<\/span> (<\/span>i32<\/span>,<\/span> f64<\/span>,<\/span> u8<\/span>)<\/span> =<\/span> (<\/span>500<\/span>,<\/span> 6.4<\/span>,<\/span> 1<\/span>);<\/span>\r\n    let<\/span> five_hundred<\/span> =<\/span> x<\/span>.0<\/span>;<\/span> \/\/500<\/span>\r\n    let<\/span> six_point_four<\/span> =<\/span> x<\/span>.1<\/span>;<\/span> \/\/6.4<\/span>\r\n    let<\/span> one<\/span> =<\/span> x<\/span>.2<\/span>;<\/span> \/\/1<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u914d\u5217<\/h3>\n
\u914d\u5217\u306f\u30bf\u30d7\u30eb\u3068\u7570\u306a\u308a\u3001\u5168\u3066\u306e\u5024\u304c\u540c\u3058\u30c7\u30fc\u30bf\u578b\u306b\u306a\u3089\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u307e\u305f\u3001\u914d\u5217\u306e\u9577\u3055\u306f\u5ba3\u8a00\u3057\u305f\u6642\u306b\u6c7a\u3081\u3089\u308c\u3066\u3001\u5ba3\u8a00\u5f8c\u306b\u8981\u7d20\u3092\u8ffd\u52a0\u3057\u305f\u308a\u3001\u524a\u9664\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3002\u8981\u7d20\u306e\u6570\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u6642\u3084\u3001\u305d\u3082\u305d\u3082\u8981\u7d20\u3092\u5909\u66f4\u3057\u306a\u3044\u3088\u3046\u306a\u6642\u306b\u5229\u7528\u3059\u308b\u3002<\/p>\n
\u30c7\u30fc\u30bf\u578b\u3084\u8981\u7d20\u6570\u3092\u6307\u5b9a\u3057\u306a\u304f\u3066\u3082\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u304c\u3001\u6307\u5b9a\u3059\u308b\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> a<\/span>:<\/span> [<\/span>i32<\/span>;<\/span> 5<\/span>]<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>];<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u307e\u305f\u3001\u5168\u3066\u306e\u8981\u7d20\u306e\u5024\u3092\u540c\u4e00\u306b\u3057\u3066\u3001\u4e00\u6c17\u306b\u5ba3\u8a00\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3002\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u5168\u8981\u7d20\u306e\u5024\u304c3\u306e\u9577\u30555\u306e\u914d\u5217\u3092\u5ba3\u8a00\u3057\u3066\u3044\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> a<\/span> =<\/span> [<\/span>3<\/span>;<\/span> 5<\/span>];<\/span> \/\/[3,3,3,3,3]\u3068\u540c\u3058<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u914d\u5217\u306e\u8981\u7d20\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> a<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>];<\/span>\r\n\r\n    let<\/span> first<\/span> =<\/span> a<\/span>[<\/span>0<\/span>];<\/span> \/\/1<\/span>\r\n    let<\/span> second<\/span> =<\/span> a<\/span>[<\/span>1<\/span>];<\/span> \/\/2<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u306f\u914d\u5217\u306b\u4f3c\u3066\u3044\u308b\u30d9\u30af\u30c8\u30eb\u578b\u304c\u3042\u308a\u3001\u3053\u3061\u3089\u306f\u30b5\u30a4\u30ba\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
\u95a2\u6570<\/h1>\n
Rust\u306e\u95a2\u6570\u306f\u3001fn\u3092\u4f7f\u3063\u3066\u4ee5\u4e0b\u306e\u4f8b\u306e\u3088\u3046\u306b\u5ba3\u8a00\u3059\u308b\u3002\u5ba3\u8a00\u306e\u9806\u756a\u306b\u95a2\u4fc2\u306f\u306a\u3044\u3002\u5f15\u6570\u3092\u4f7f\u3046\u3068\u304d\u306f\u3001\u5404\u5f15\u6570\u306e\u30c7\u30fc\u30bf\u578b\u3092\u6307\u5b9a\u3057\u306a\u304f\u3066\u306f\u306a\u3089\u306a\u3044\u3002Rust\u306e\u6163\u7fd2\u3068\u3057\u3066\u3001\u95a2\u6570\u306e\u540d\u524d\u306f\u5c0f\u6587\u5b57\u306e\u5358\u8a9e\u3092\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc\uff08_\uff09\u3067\u9023\u7d50\u3057\u305f\u3082\u306e\u3092\u4f7f\u3046\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Hello, world!\"<\/span>);<\/span>\r\n\r\n    test_function_no_params<\/span>();<\/span>\r\n    print_labeled_measurement<\/span>(<\/span>5<\/span>,<\/span> 'h'<\/span>);<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> test_function_no_params<\/span>()<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"Test function.\"<\/span>);<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> print_labeled_measurement<\/span>(<\/span>value<\/span>:<\/span> i32<\/span>,<\/span> unit_label<\/span>:<\/span> char<\/span>)<\/span> {<\/span>\r\n    println!<\/span>(<\/span>\"The measurement is: {}{}\"<\/span>,<\/span> value<\/span>,<\/span> unit_label<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
$ <\/span>cargo run\r\n   Compiling playground v0.0.1 (<\/span>\/playground)<\/span>\r\n    Finished dev [<\/span>unoptimized + debuginfo] target(<\/span>s)<\/span> in <\/span>2.60s\r\n     Running `<\/span>target\/debug\/playground`<\/span>\r\nHello, world!\r\nTest function<\/span>.<\/span>\r\nThe measurement is: 5h\r\n<\/code><\/pre>\n
\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3068\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3<\/h2>\n
\u3044\u304f\u3064\u304b\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u6307\u793a\u3092\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3001\u306a\u3093\u3089\u304b\u306e\u8a08\u7b97\u7d50\u679c\u3092\u8fd4\u3059\u3082\u306e\u3092\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3068\u547c\u3076\u3002\u95a2\u6570\u306e\u4e2d\u8eab\u306f\u8907\u6570\u306e\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306b\u3088\u308a\u69cb\u6210\u3055\u308c\u3001\u305f\u307e\u306b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3067\u7d42\u308f\u308b\u3002\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306f\u30bb\u30df\u30b3\u30ed\u30f3;\u3067\u7d42\u4e86\u3057\u3001\u5024\u3092\u8fd4\u3055\u306a\u3044\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u95a2\u6570\u306f\u30a8\u30e9\u30fc\u304c\u51fa\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> (<\/span>let<\/span> y<\/span> =<\/span> 6<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
$ <\/span>cargo run\r\n   Compiling functions v0.1.0 (<\/span>file:\/\/\/projects\/functions)<\/span>\r\nerror: expected expression, found statement (<\/span>`<\/span>let<\/span>`<\/span>)<\/span>\r\n --<\/span>><\/span> src\/main.rs:2:14\r\n  |\r\n2 |     let <\/span>x =<\/span> (<\/span>let <\/span>y =<\/span> 6)<\/span>;<\/span>\r\n  |              ^^^^^^^^^\r\n  |\r\n  =<\/span> note: variable declaration using `<\/span>let<\/span>`<\/span> is a statement\r\n\r\nerror[E0658]: `<\/span>let<\/span>`<\/span> expressions in <\/span>this position are experimental\r\n --<\/span>><\/span> src\/main.rs:2:14\r\n  |\r\n2 |     let <\/span>x =<\/span> (<\/span>let <\/span>y =<\/span> 6)<\/span>;<\/span>\r\n  |              ^^^^^^^^^\r\n  |\r\n  =<\/span> note: see issue #53667 <https:\/\/github.com\/rust-lang\/rust\/issues\/53667> for more information<\/span>\r\n  =<\/span> help<\/span>: you can write `<\/span>matches!(<\/span><expr<\/span>><\/span>, <pattern>)<\/span>`<\/span> instead of `<\/span>let<\/span> <pattern> =<\/span> <expr<\/span>><\/span>`<\/span>\r\n\r\nwarning: unnecessary parentheses around assigned value\r\n --<\/span>><\/span> src\/main.rs:2:13\r\n  |\r\n2 |     let <\/span>x =<\/span> (<\/span>let <\/span>y =<\/span> 6)<\/span>;<\/span>\r\n  |             ^         ^\r\n  |\r\n  =<\/span> note: `<\/span>#[warn(unused_parens)]` on by default<\/span>\r\nhelp<\/span>: remove these parentheses\r\n  |\r\n2 -     let <\/span>x =<\/span> (<\/span>let <\/span>y =<\/span> 6)<\/span>;<\/span>\r\n2 +     let <\/span>x =<\/span> let <\/span>y =<\/span> 6;<\/span>\r\n  |\r\n\r\nFor more information about this error, try `<\/span>rustc --explain<\/span> E0658`<\/span>.<\/span>\r\nwarning: `<\/span>functions`<\/span> (<\/span>bin \"functions\"<\/span>)<\/span> generated 1 warning\r\nerror: could not compile `<\/span>functions`<\/span> due to 2 previous errors;<\/span> 1 warning emitted\r\n<\/code><\/pre>\n
\u30b9\u30b3\u30fc\u30d7\u3082\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u306b\u306a\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u3053\u3053\u3067\u3001\u30b9\u30b3\u30fc\u30d7\u306e\u4e2d\u8eab\u306e\u6700\u5f8c\u306b\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u5165\u308c\u3066\u306f\u3044\u3051\u306a\u3044\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> y<\/span> =<\/span> {<\/span>\r\n        let<\/span> x<\/span> =<\/span> 3<\/span>;<\/span>\r\n        x<\/span> +<\/span> 1<\/span>\r\n    };<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The value of y is: {}\"<\/span>,<\/span> y<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
$ <\/span>cargo run\r\n   Compiling playground v0.0.1 (<\/span>\/playground)<\/span>\r\n    Finished dev [<\/span>unoptimized + debuginfo] target(<\/span>s)<\/span> in <\/span>1.44s\r\n     Running `<\/span>target\/debug\/playground`<\/span>\r\nThe value of y is: 4\r\n<\/code><\/pre>\n
\u8fd4\u308a\u5024<\/h2>\n
\u95a2\u6570\u304c\u5024\u3092\u8fd4\u3059\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u6700\u521d\u306e\u5ba3\u8a00\u3067\u306a\u3093\u306e\u30c7\u30fc\u30bf\u578b\u306e\u5024\u3092\u8fd4\u3059\u306e\u304b\u3092->\u3092\u4f7f\u3063\u3066\u6307\u5b9a\u3057\u306a\u304f\u3066\u306f\u306a\u3089\u306a\u3044\u3002return\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u3063\u3066\u660e\u793a\u7684\u306b\u5024\u3092\u8fd4\u3059\u3053\u3068\u3082\u3067\u304d\u308b\u304c\u3001Rust\u3067\u306f\u6697\u9ed9\u7684\u306b\u4e00\u756a\u6700\u5f8c\u306e\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3092\u8fd4\u3059\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> x<\/span> =<\/span> plus_one<\/span>(<\/span>5<\/span>);<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The value of x is: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> plus_one<\/span>(<\/span>x<\/span>:<\/span> i32<\/span>)<\/span> -><\/span> i32<\/span> {<\/span>\r\n    x<\/span> +<\/span> 1<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
$ <\/span>cargo run\r\n   Compiling functions v0.1.0 (<\/span>file:\/\/\/projects\/functions)<\/span>\r\n    Finished dev [<\/span>unoptimized + debuginfo] target(<\/span>s)<\/span> in <\/span>0.30s\r\n     Running `<\/span>target\/debug\/functions`<\/span>\r\nThe value of x is: 6\r\n<\/code><\/pre>\n
\u3053\u3053\u3067\u3001plus_one\u95a2\u6570\u306e\u6700\u5f8c\u3092x + 1;\u3068\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u3064\u3051\u3066\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u304c\u51fa\u308b\u3002<\/p>\n
$ <\/span>cargo run\r\n   Compiling functions v0.1.0 (<\/span>file:\/\/\/projects\/functions)<\/span>\r\nerror[E0308]: mismatched types\r\n --<\/span>><\/span> src\/main.rs:7:24\r\n  |\r\n7 | fn plus_one(<\/span>x: i32)<\/span> -> i32 {<\/span>\r\n  |    --------<\/span>            ^^^ expected `<\/span>i32`<\/span>, found `<\/span>()<\/span>`<\/span>\r\n  |    |\r\n  |    implicitly returns `<\/span>()<\/span>`<\/span> as its body has no tail <\/span>or `<\/span>return<\/span>`<\/span> expression\r\n8 |     x + 1;<\/span>\r\n  |          - help<\/span>: consider removing this semicolon\r\n\r\nFor more information about this error, try `<\/span>rustc --explain<\/span> E0308`<\/span>.<\/span>\r\nerror: could not compile `<\/span>functions`<\/span> due to previous error\r\n<\/code><\/pre>\n
\u6761\u4ef6\u5206\u5c90\u30fb\u7e70\u308a\u8fd4\u3057<\/h1>\n
if\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3<\/h2>\n
\u6761\u4ef6\u5206\u5c90\u306e\u5229\u7528\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306bif\u3092\u5229\u7528\u3059\u308b\u3002\u6761\u4ef6\u90e8\u5206\u306f\u30d6\u30fc\u30eb\u5024\u304c\u8fd4\u308b\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u306e\u307f\u6307\u5b9a\u53ef\u80fd\u3002else\u306f\u6307\u5b9a\u3057\u306a\u304f\u3066\u3082\u5927\u4e08\u592b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> number1<\/span> =<\/span> 3<\/span>;<\/span>\r\n    let<\/span> number2<\/span> =<\/span> 7<\/span>;<\/span>\r\n\r\n    \/\/ if condition { expressions }<\/span>\r\n    if<\/span> number1<\/span> ><\/span> 5<\/span> &&<\/span> number2<\/span> ><\/span> 5<\/span>  {<\/span>\r\n        println!<\/span>(<\/span>\"both number1 and number2 are greater than 5\"<\/span>);<\/span>\r\n    }<\/span> else<\/span> if<\/span> !<\/span>(<\/span>number1<\/span> ><\/span> 5<\/span> ||<\/span> number2<\/span> ><\/span> 5<\/span>)<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"both number1 and number2 are less than 5\"<\/span>);<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"either number1 or number2 is greater than 5\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6761\u4ef6\u306e\u5f8c\u306f\u30d6\u30ed\u30c3\u30af\u3092\u8a18\u8ff0\u3059\u308b\u3002\u30d6\u30ed\u30c3\u30af\u5185\u306b\u306f\u30a8\u30af\u30b9\u30d7\u30ec\u30c3\u30b7\u30e7\u30f3\u3092\u8a18\u8ff0\u3059\u308b\u3002\u305d\u306e\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30d6\u30ed\u30c3\u30af\u3067\u5024\u3092\u8fd4\u3059\u3053\u3068\u3082\u3067\u304d\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> condition<\/span> =<\/span> true<\/span>;<\/span>\r\n\r\n    let<\/span> result<\/span> =<\/span> if<\/span> condition<\/span> {<\/span> \"Yes\"<\/span> }<\/span> else<\/span> {<\/span> \"No\"<\/span> };<\/span>\r\n\r\n    println!<\/span>(<\/span>\"is condition true?: {}\"<\/span>,<\/span> result<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u305f\u3060\u3057\u3001\u5404\u30d6\u30ed\u30c3\u30af\u3067\u8fd4\u308b\u5024\u306e\u578b\u306f\u540c\u3058\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u9055\u3046\u578b\u306e\u5024\u304c\u8fd4\u308b\u3068\u304d\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u304c\u51fa\u308b\u3002<\/p>\n
$ <\/span>cargo run\r\n   Compiling playground v0.0.1 (<\/span>\/playground)<\/span>\r\nerror[E0308]: `<\/span>if<\/span>`<\/span> and `<\/span>else<\/span>`<\/span> have incompatible types\r\n --<\/span>><\/span> src\/main.rs:4:48\r\n  |\r\n4 |     let <\/span>result =<\/span> if <\/span>condition {<\/span> \"Yes\"<\/span> }<\/span> else<\/span> {<\/span> 1 }<\/span>;<\/span>\r\n  |                                 -----<\/span>          ^ expected `<\/span>&str`<\/span>, found integer\r\n  |                                 |\r\n  |                                 expected because of this\r\n\r\nFor more information about this error, try `<\/span>rustc --explain<\/span> E0308`<\/span>.<\/span>\r\nerror: could not compile `<\/span>playground`<\/span> due to previous error\r\n<\/code><\/pre>\n
\u7e70\u308a\u8fd4\u3057<\/h2>\n
Rust\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306b\u306floop, while, for\u304c\u3042\u308b\u3002<\/p>\n
loop\u306b\u3088\u308b\u7e70\u308a\u8fd4\u3057<\/h3>\n
loop\u3092\u5229\u7528\u3059\u308b\u3068\u3001break\u3092\u4f7f\u3063\u3066\u660e\u793a\u7684\u306b\u6b62\u3081\u306a\u3044\u9650\u308a\u3001\u30d6\u30ed\u30c3\u30af\u5185\u306b\u66f8\u304b\u308c\u305f\u51e6\u7406\u304c\u6c38\u9060\u306b\u5b9f\u884c\u3055\u308c\u308b\u3002\u307e\u305f\u3001\u4ed6\u306e\u8a00\u8a9e\u3068\u540c\u69d8\u306bcontinue\u3092\u5229\u7528\u3057\u3066\u3001\u30eb\u30fc\u30d7\u5185\u306e\u6b8b\u308a\u306e\u51e6\u7406\u3092\u30b9\u30ad\u30c3\u30d7\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u305f\u3068\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> count<\/span> =<\/span> 0<\/span>;<\/span>\r\n    loop<\/span> {<\/span>\r\n        if<\/span> count<\/span> ><\/span> 5<\/span> {<\/span> break<\/span>;<\/span> }<\/span>\r\n        count<\/span> +=<\/span> 1<\/span>;<\/span>\r\n\r\n        if<\/span> count<\/span> %<\/span> 2<\/span> ==<\/span> 1<\/span> {<\/span> continue<\/span>;<\/span> }<\/span>\r\n        println!<\/span>(<\/span>\"count: {}\"<\/span>,<\/span> count<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
count: 2\r\ncount: 4\r\ncount: 6\r\n<\/code><\/pre>\n
break\u3084continue\u306f\u3001\u3053\u308c\u3089\u306e\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u304c\u8a18\u8ff0\u3055\u308c\u305f\u30d6\u30ed\u30c3\u30af\u306e\u7e70\u308a\u8fd4\u3057\u306b\u5bfe\u3057\u3066\u306e\u307f\u6709\u52b9\u3067\u3042\u308b\u3002\u3057\u304b\u3057\u3001loop\u306b\u306f\u30aa\u30d7\u30b7\u30e7\u30f3\u3068\u3057\u3066\u30e9\u30d9\u30eb\u3092\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u3001break\u3084continue\u306e\u5f8c\u306b\u30e9\u30d9\u30eb\u3092\u3064\u3051\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u5bfe\u8c61\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u30e9\u30d9\u30eb\u306f\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\uff08’\uff09\u3067\u59cb\u3081\u308b\u3002\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001\u5916\u5074\u306eloop\u306b\u5bfe\u3057\u3066’counting_up\u3068\u3044\u3046\u30e9\u30d9\u30eb\u304c\u4ed8\u3051\u3089\u308c\u3066\u3044\u3066\u3001count\u304c2\u306e\u6642\u306b\u5916\u5074\u306eloop\u3092\u7d42\u4e86\u3057\u3066\u3044\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> count<\/span> =<\/span> 0<\/span>;<\/span>\r\n    'counting_up<\/span>:<\/span> loop<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"count = {}\"<\/span>,<\/span> count<\/span>);<\/span>\r\n        let<\/span> mut<\/span> remaining<\/span> =<\/span> 10<\/span>;<\/span>\r\n\r\n        loop<\/span> {<\/span>\r\n            println!<\/span>(<\/span>\"remaining = {}\"<\/span>,<\/span> remaining<\/span>);<\/span>\r\n            if<\/span> remaining<\/span> ==<\/span> 9<\/span> {<\/span>\r\n                break<\/span>;<\/span>\r\n            }<\/span>\r\n            if<\/span> count<\/span> ==<\/span> 2<\/span> {<\/span>\r\n                break<\/span> 'counting_up<\/span>;<\/span>\r\n            }<\/span>\r\n            remaining<\/span> -=<\/span> 1<\/span>;<\/span>\r\n        }<\/span>\r\n\r\n        count<\/span> +=<\/span> 1<\/span>;<\/span>\r\n    }<\/span>\r\n    println!<\/span>(<\/span>\"End count = {}\"<\/span>,<\/span> count<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
count = 0\r\nremaining = 10\r\nremaining = 9\r\ncount = 1\r\nremaining = 10\r\nremaining = 9\r\ncount = 2\r\nremaining = 10\r\nEnd count = 2\r\n<\/code><\/pre>\n
\u307e\u305f\u3001loop\u306fbreak\u306e\u5f8c\u306b\u5024\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u305d\u306e\u5024\u3092\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> counter<\/span> =<\/span> 0<\/span>;<\/span>\r\n\r\n    let<\/span> result<\/span> =<\/span> loop<\/span> {<\/span>\r\n        counter<\/span> +=<\/span> 1<\/span>;<\/span>\r\n\r\n        if<\/span> counter<\/span> ==<\/span> 10<\/span> {<\/span>\r\n            break<\/span> counter<\/span> *<\/span> 2<\/span>;<\/span>\r\n        }<\/span>\r\n    };<\/span>\r\n\r\n    println!<\/span>(<\/span>\"The result is {}\"<\/span>,<\/span> result<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
The result is 20\r\n<\/code><\/pre>\n
while\u306b\u3088\u308b\u7e70\u308a\u8fd4\u3057<\/h3>\n
while\u306e\u5f8c\u306b\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u4ed6\u306e\u8a00\u8a9e\u3068\u540c\u69d8\u306e\u7e70\u308a\u8fd4\u3057\u3092\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> mut<\/span> count<\/span> =<\/span> 0<\/span>;<\/span>\r\n    \/\/ while condition { expressions }<\/span>\r\n    while<\/span> count<\/span> <=<\/span> 5<\/span> {<\/span>\r\n        count<\/span> +=<\/span> 1<\/span>;<\/span>\r\n\r\n        if<\/span> count<\/span> %<\/span> 2<\/span> ==<\/span> 1<\/span> {<\/span> continue<\/span>;<\/span> }<\/span>\r\n        println!<\/span>(<\/span>\"count: {}\"<\/span>,<\/span> count<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
count: 2\r\ncount: 4\r\ncount: 6\r\n<\/code><\/pre>\n
while\u306b\u3082\u30e9\u30d9\u30eb\u3092\u3064\u3051\u3066break\u3084continue\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u3057\u304b\u3057\u3001while\u306f\u5024\u3092\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3002<\/p>\n
for\u306b\u3088\u308b\u7e70\u308a\u8fd4\u3057<\/h3>\n
for\u306b\u3088\u308b\u7e70\u308a\u8fd4\u3057\u306f\u3001Python\u306a\u3069\u3068\u540c\u3058\u3088\u3046\u306a\u4f7f\u3044\u65b9\u3067\u3001\u914d\u5217\u306a\u3069\u3092\u6307\u5b9a\u3057\u3066\u5404\u8981\u7d20\u306b\u5bfe\u3057\u3066\u540c\u3058\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n    let<\/span> test_array<\/span> =<\/span> [<\/span>\"one\"<\/span>,<\/span> \"two\"<\/span>,<\/span> \"three\"<\/span>];<\/span>\r\n    \/\/ for element in array { expressions }<\/span>\r\n    for<\/span> str<\/span> in<\/span> test_array<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> str<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    for<\/span> number<\/span> in<\/span> (<\/span>9<\/span>..<\/span>21<\/span>)<\/span>.step_by<\/span>(<\/span>3<\/span>)<\/span>.rev<\/span>()<\/span> {<\/span>\r\n        println!<\/span>(<\/span>\"number: {}\"<\/span>,<\/span> number<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
one\r\ntwo\r\nthree\r\nnumber: 18\r\nnumber: 15\r\nnumber: 12\r\nnumber: 9\r\n<\/code><\/pre>\n
\u4e0a\u306e2\u756a\u76ee\u306efor\u6587\u306e\u3088\u3046\u306bRange\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3002\u8a73\u3057\u304f\u306f\u6b21\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u53c2\u7167\uff08Range in std::ops\uff09\u3002<\/p>\n
\u53c2\u8003\u6587\u732e<\/h1>\n
    \n
  • \n
      https:\/\/www.rust-lang.org\/<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        https:\/\/doc.rust-lang.org\/std\/primitive.u32.html<\/ul>\n","protected":false},"excerpt":{"rendered":"
        \u306f\u3058\u3081\u306b \u6700\u8fd1\u3001Rust\u3092\u52c9\u5f37\u3059\u308b\u3068\u826f\u3044\u3068\u5148\u8f29\u306b\u6559\u3048\u3066\u3082\u3089\u3063\u305f\u306e\u3067\u3001\u52c9\u5f37\u3092\u59cb\u3081\u3066\u307f\u307e\u3057\u305f\u3002\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304c\u7d50\u69cb\u9577 […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44887","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/44887-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u306f\u3058\u3081\u306b \u6700\u8fd1\u3001Rust\u3092\u52c9\u5f37\u3059\u308b\u3068\u826f\u3044\u3068\u5148\u8f29\u306b\u6559\u3048\u3066\u3082\u3089\u3063\u305f\u306e\u3067\u3001\u52c9\u5f37\u3092\u59cb\u3081\u3066\u307f\u307e\u3057\u305f\u3002\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304c\u7d50\u69cb\u9577 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/44887-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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