{"id":25858,"date":"2024-03-17T05:44:57","date_gmt":"2024-03-16T20:44:57","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%ae%e5%85%a5%e5%8a%9b%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0ifstream%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e8%a9%b3%e3%81%97%e3%81%8f%e8%aa%ac\/"},"modified":"2024-03-22T12:29:19","modified_gmt":"2024-03-22T03:29:19","slug":"c%e3%81%ae%e5%85%a5%e5%8a%9b%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0ifstream%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e8%a9%b3%e3%81%97%e3%81%8f%e8%aa%ac","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%ae%e5%85%a5%e5%8a%9b%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0ifstream%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e8%a9%b3%e3%81%97%e3%81%8f%e8%aa%ac\/","title":{"rendered":"C++\u306e\u5165\u529b\u30d5\u30a1\u30a4\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0ifstream\u306e\u4f7f\u3044\u65b9\u3092\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u3002"},"content":{"rendered":"

ifstream\u306f\u3001C++\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u542b\u307e\u308c\u308b\u5165\u529b\u30d5\u30a1\u30a4\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0\u30af\u30e9\u30b9\u3067\u3001\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304f\u3001\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308b\u3001\u30d5\u30a1\u30a4\u30eb\u30dd\u30a4\u30f3\u30bf\u3092\u64cd\u4f5c\u3059\u308b\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u95a2\u6570\u3084\u6f14\u7b97\u5b50\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002ifstream\u306e\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u7d30\u306b\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

    \n
  1. ifstream\u30af\u30e9\u30b9\u306e\u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb\uff1a
    \n#include<\/li>\n
  2. ifstream \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\uff1a
    \nifstream inputFile;<\/li>\n
  3. \u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304f\u969b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\uff1a
    \ninputFile.open(“filename”);
    \n\u307e\u305f\u306f
    \ninputFile.open(“filename”, ios::in);
    \n\u3053\u3053\u3067\u306e”filename”\u306f\u8aad\u307f\u8fbc\u3080\u30d5\u30a1\u30a4\u30eb\u306e\u540d\u524d\u3067\u3059\u3002<\/li>\n
  4. \u30d5\u30a1\u30a4\u30eb\u304c\u6b63\u5e38\u306b\u958b\u304b\u308c\u305f\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n
  5. \u3082\u3057\uff08inputFile.is_open\uff08\uff09\uff09{
    \n\/\/\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3051\u305f
    \n} else {
    \n\/\/\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3051\u306a\u304b\u3063\u305f
    \n}<\/li>\n
  6. \u30d5\u30a1\u30a4\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080:<\/li>\n
  7. int data;
    \ninputFile >> data;\u30c7\u30fc\u30bf\u578b data;
    \ninputFile >> data;<\/li>\n
  8. \u3053\u306e\u5834\u5408<\/li>\n
  9. \u6587\u5b57\u5217 line;
    \ngetline(inputFile, line);<\/li>\n
  10. \u7b2c1\u3064\u306e\u4f7f\u3044\u65b9\u306f\u6574\u6570\u3084\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306a\u3069\u306e\u57fa\u672c\u7684\u306a\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u7b2c2\u3064\u306e\u4f7f\u3044\u65b9\u306f\u6587\u5b57\u5217\u3092\u8aad\u307f\u53d6\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n
  11. \u30d5\u30a1\u30a4\u30eb\u3092\u9589\u3058\u308b\uff1a
    \ninputFile.close();<\/li>\n<\/ol>\n

    ifstream\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0a\u3067\u8ff0\u3079\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u306b\u306f\u4e00\u822c\u7684\u306b\u4f7f\u308f\u308c\u308b\u64cd\u4f5c\u95a2\u6570\u3092\u3044\u304f\u3064\u304b\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n

      \n
    1. good()\u95a2\u6570\uff1a\u30d5\u30a1\u30a4\u30eb\u304c\u6b63\u5e38\u306b\u958b\u304b\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n
    2. eof()\u95a2\u6570\uff1a\u30d5\u30a1\u30a4\u30eb\u306e\u7d42\u308f\u308a\u306b\u9054\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n
    3. fail()\uff1a\u8aad\u307f\u8fbc\u307f\u30a8\u30e9\u30fc\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002<\/li>\n
    4. clear()\uff1a\u30a8\u30e9\u30fc\u72b6\u614b\u30d5\u30e9\u30b0\u3092\u30af\u30ea\u30a2\u3059\u308b\u3002<\/li>\n
    5. ignore(n, delim)\uff1an\u6587\u5b57\u98db\u3070\u3059\u304b\u3001\u5b9a\u754c\u6587\u5b57delim\u306b\u9054\u3059\u308b\u307e\u3067\u7121\u8996\u3059\u308b\u3002<\/li>\n<\/ol>\n

      \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff1a<\/p>\n

      #include<\/span> <iostream><\/span><\/span>\r\n#include<\/span> <fstream><\/span><\/span>\r\n\r\nusing<\/span> namespace<\/span> std;\r\n\r\nint<\/span> main<\/span>()<\/span> <\/span>{\r\n    ifstream inputFile;\r\n    inputFile.open<\/span>(\"input.txt\"<\/span>);\r\n\r\n    if<\/span> (inputFile.is_open<\/span>()) {\r\n        int<\/span> data;\r\n        while<\/span> (inputFile >> data) {\r\n            cout << data << \" \"<\/span>;\r\n        }\r\n        inputFile.close<\/span>();\r\n    } else<\/span> {\r\n        cout << \"File open failed.\"<\/span> << endl;\r\n    }\r\n\r\n    return<\/span> 0<\/span>;\r\n}\r\n<\/code><\/pre>\n
      ifstream\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3068\u4e00\u90e8\u306e\u3088\u304f\u4f7f\u308f\u308c\u308b\u64cd\u4f5c\u95a2\u6570\u304c\u8aac\u660e\u3055\u308c\u3066\u3044\u307e\u3059\u3002ifstream\u3092\u4f7f\u3046\u3068\u3001\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u7c21\u5358\u306b\u8aad\u307f\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      ifstream\u306f\u3001C++\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u542b\u307e\u308c\u308b\u5165\u529b\u30d5\u30a1\u30a4\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0\u30af\u30e9\u30b9\u3067\u3001\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304f\u3001\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308b\u3001\u30d5\u30a1\u30a4\u30eb\u30dd\u30a4\u30f3\u30bf\u3092\u64cd\u4f5c\u3059\u308b\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u95a2\u6570\u3084\u6f14\u7b97\u5b50\u304c […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-25858","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nC++\u306e\u5165\u529b\u30d5\u30a1\u30a4\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0ifstream\u306e\u4f7f\u3044\u65b9\u3092\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u3002 - 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\/ja\/blog\/c\u306e\u5165\u529b\u30d5\u30a1\u30a4\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0ifstream\u306e\u4f7f\u3044\u65b9\u3092\u8a73\u3057\u304f\u8aac\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++\u306e\u5165\u529b\u30d5\u30a1\u30a4\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0ifstream\u306e\u4f7f\u3044\u65b9\u3092\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:description\" content=\"ifstream\u306f\u3001C++\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u542b\u307e\u308c\u308b\u5165\u529b\u30d5\u30a1\u30a4\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0\u30af\u30e9\u30b9\u3067\u3001\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304f\u3001\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308b\u3001\u30d5\u30a1\u30a4\u30eb\u30dd\u30a4\u30f3\u30bf\u3092\u64cd\u4f5c\u3059\u308b\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u95a2\u6570\u3084\u6f14\u7b97\u5b50\u304c […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/c\u306e\u5165\u529b\u30d5\u30a1\u30a4\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0ifstream\u306e\u4f7f\u3044\u65b9\u3092\u8a73\u3057\u304f\u8aac\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T20:44:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T03:29:19+00:00\" \/>\n<meta name=\"author\" content=\"\u7dbe\u4e43, \u4e00\u5e0c\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u7dbe\u4e43, \u4e00\u5e0c\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%ae%e5%85%a5%e5%8a%9b%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0ifstream%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e8%a9%b3%e3%81%97%e3%81%8f%e8%aa%ac\/\",\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%ae%e5%85%a5%e5%8a%9b%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%83%a0ifstream%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e8%a9%b3%e3%81%97%e3%81%8f%e8%aa%ac\/\",\"name\":\"C++\u306e\u5165\u529b\u30d5\u30a1\u30a4\u30eb\u30b9\u30c8\u30ea\u30fc\u30e0ifstream\u306e\u4f7f\u3044\u65b9\u3092\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u3002 - 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