{"id":3253,"date":"2025-03-28T00:00:02","date_gmt":"2025-03-27T16:00:02","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3253"},"modified":"2025-03-28T00:00:02","modified_gmt":"2025-03-27T16:00:02","slug":"c-%e5%be%aa%e7%8e%af%ef%bc%88loops-in-c%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/28\/c-%e5%be%aa%e7%8e%af%ef%bc%88loops-in-c%ef%bc%89\/","title":{"rendered":"C++ \u5faa\u73af\uff08Loops in C++\uff09"},"content":{"rendered":"\n

\u5faa\u73af\u662f C++ \u4e2d\u7528\u4e8e\u91cd\u590d\u6267\u884c\u4e00\u6bb5\u4ee3\u7801\u7684\u7ed3\u6784\u3002C++ \u63d0\u4f9b\u4e86\u4e09\u79cd\u4e3b\u8981\u7684\u5faa\u73af\u7ed3\u6784\uff1afor<\/code> \u5faa\u73af\u3001while<\/code> \u5faa\u73af\u548c do-while<\/code> \u5faa\u73af\u3002\u5b83\u4eec\u5141\u8bb8\u7a0b\u5e8f\u6839\u636e\u67d0\u4e2a\u6761\u4ef6\u91cd\u590d\u6267\u884c\u4ee3\u7801\u5757\uff0c\u76f4\u5230\u6761\u4ef6\u4e0d\u6ee1\u8db3\u3002<\/p>\n\n\n\n

\n\n\n\n

1. for<\/code> \u5faa\u73af<\/strong><\/h2>\n\n\n\n

for<\/code> \u5faa\u73af\u7528\u4e8e\u5728\u5df2\u77e5\u6b21\u6570\u7684\u60c5\u51b5\u4e0b\u91cd\u590d\u6267\u884c\u67d0\u6bb5\u4ee3\u7801\u3002for<\/code> \u5faa\u73af\u7684\u57fa\u672c\u7ed3\u6784\u5305\u62ec\u521d\u59cb\u5316\u3001\u6761\u4ef6\u5224\u65ad\u548c\u66f4\u65b0\u64cd\u4f5c\u3002<\/p>\n\n\n\n

1.1 \u8bed\u6cd5\uff1a<\/strong><\/h3>\n\n\n\n
for (initialization; condition; update) {\n    \/\/ \u5faa\u73af\u4f53\n}<\/code><\/pre>\n\n\n\n
    \n
  • initialization<\/strong>\uff1a\u521d\u59cb\u5316\u90e8\u5206\uff0c\u53ea\u4f1a\u6267\u884c\u4e00\u6b21\u3002<\/li>\n\n\n\n
  • condition<\/strong>\uff1a\u6bcf\u6b21\u5faa\u73af\u524d\u5224\u65ad\u7684\u6761\u4ef6\uff0c\u82e5\u6761\u4ef6\u4e3a true<\/code>\uff0c\u5219\u6267\u884c\u5faa\u73af\u4f53\u3002<\/li>\n\n\n\n
  • update<\/strong>\uff1a\u6bcf\u6b21\u5faa\u73af\u540e\u6267\u884c\u7684\u66f4\u65b0\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n\n\n\n
    1.2 \u793a\u4f8b\uff1a\u4f7f\u7528 for<\/code> \u5faa\u73af<\/strong><\/h3>\n\n\n\n
    #include <iostream>\nusing namespace std;\n\nint main() {\n    for (int i = 0; i < 5; i++) {\n        cout << \"i: \" << i << endl;\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
    i: 0\ni: 1\ni: 2\ni: 3\ni: 4<\/code><\/pre>\n\n\n\n
      \n
    • \u8fd9\u6bb5\u4ee3\u7801\u4f7f\u7528 for<\/code> \u5faa\u73af\u6253\u5370\u4ece 0 \u5230 4 \u7684\u6570\u5b57\u3002<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n
      2. while<\/code> \u5faa\u73af<\/strong><\/h2>\n\n\n\n
      while<\/code> \u5faa\u73af\u7528\u4e8e\u5728\u6ee1\u8db3\u67d0\u4e2a\u6761\u4ef6\u7684\u60c5\u51b5\u4e0b\u91cd\u590d\u6267\u884c\u4ee3\u7801\uff0c\u6761\u4ef6\u5224\u65ad\u5728\u5faa\u73af\u5f00\u59cb\u524d\u8fdb\u884c\u3002<\/p>\n\n\n\n
      2.1 \u8bed\u6cd5\uff1a<\/strong><\/h3>\n\n\n\n
      while (condition) {\n    \/\/ \u5faa\u73af\u4f53\n}<\/code><\/pre>\n\n\n\n
        \n
      • condition<\/strong>\uff1a\u5faa\u73af\u5f00\u59cb\u524d\u5224\u65ad\u7684\u6761\u4ef6\u3002\u5982\u679c\u6761\u4ef6\u4e3a true<\/code>\uff0c\u5219\u6267\u884c\u5faa\u73af\u4f53\u3002<\/li>\n<\/ul>\n\n\n\n
        2.2 \u793a\u4f8b\uff1a\u4f7f\u7528 while<\/code> \u5faa\u73af<\/strong><\/h3>\n\n\n\n
        #include <iostream>\nusing namespace std;\n\nint main() {\n    int i = 0;\n    while (i < 5) {\n        cout << \"i: \" << i << endl;\n        i++;  \/\/ \u66f4\u65b0\u64cd\u4f5c\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n
        \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
        i: 0\ni: 1\ni: 2\ni: 3\ni: 4<\/code><\/pre>\n\n\n\n
          \n
        • \u8be5\u793a\u4f8b\u4e2d\u7684 while<\/code> \u5faa\u73af\u4e0e for<\/code> \u5faa\u73af\u7c7b\u4f3c\uff0c\u90fd\u4f1a\u6253\u5370\u4ece 0 \u5230 4 \u7684\u6570\u5b57\uff0c\u5dee\u5f02\u5728\u4e8e while<\/code> \u5faa\u73af\u6ca1\u6709\u521d\u59cb\u5316\u90e8\u5206\uff0c\u6240\u6709\u7684\u64cd\u4f5c\u90fd\u5fc5\u987b\u5728\u5faa\u73af\u4f53\u5185\u6216\u5faa\u73af\u524d\u5b8c\u6210\u3002<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n
          3. do-while<\/code> \u5faa\u73af<\/strong><\/h2>\n\n\n\n
          do-while<\/code> \u5faa\u73af\u4e0e while<\/code> \u5faa\u73af\u7c7b\u4f3c\uff0c\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\u5b83\u662f\u5148\u6267\u884c\u4e00\u6b21\u5faa\u73af\u4f53\uff0c\u7136\u540e\u518d\u5224\u65ad\u5faa\u73af\u6761\u4ef6\u3002\u5982\u679c\u6761\u4ef6\u4e3a true<\/code>\uff0c\u5219\u7ee7\u7eed\u6267\u884c\u5faa\u73af\u3002<\/p>\n\n\n\n
          3.1 \u8bed\u6cd5\uff1a<\/strong><\/h3>\n\n\n\n
          do {\n    \/\/ \u5faa\u73af\u4f53\n} while (condition);<\/code><\/pre>\n\n\n\n
            \n
          • condition<\/strong>\uff1a\u6bcf\u6b21\u5faa\u73af\u7ed3\u675f\u65f6\u5224\u65ad\u7684\u6761\u4ef6\u3002\u5982\u679c\u6761\u4ef6\u4e3a true<\/code>\uff0c\u5219\u7ee7\u7eed\u5faa\u73af\u3002<\/li>\n<\/ul>\n\n\n\n
            3.2 \u793a\u4f8b\uff1a\u4f7f\u7528 do-while<\/code> \u5faa\u73af<\/strong><\/h3>\n\n\n\n
            #include <iostream>\nusing namespace std;\n\nint main() {\n    int i = 0;\n    do {\n        cout << \"i: \" << i << endl;\n        i++;\n    } while (i < 5);\n    return 0;\n}<\/code><\/pre>\n\n\n\n
            \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
            i: 0\ni: 1\ni: 2\ni: 3\ni: 4<\/code><\/pre>\n\n\n\n
              \n
            • \u4e0e while<\/code> \u5faa\u73af\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0cdo-while<\/code> \u5faa\u73af\u4f1a\u81f3\u5c11\u6267\u884c\u4e00\u6b21\uff0c\u5373\u4f7f\u5faa\u73af\u6761\u4ef6\u4e00\u5f00\u59cb\u5c31\u662f false<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n
              \n\n\n\n
              4. \u5faa\u73af\u63a7\u5236\u8bed\u53e5<\/strong><\/h2>\n\n\n\n
              C++ \u63d0\u4f9b\u4e86\u4e09\u79cd\u4e3b\u8981\u7684\u63a7\u5236\u8bed\u53e5\u7528\u4e8e\u63a7\u5236\u5faa\u73af\u7684\u6267\u884c\uff1a<\/p>\n\n\n\n
              4.1 break<\/code> \u8bed\u53e5<\/strong><\/h3>\n\n\n\n
              break<\/code> \u8bed\u53e5\u7528\u4e8e\u7acb\u5373\u7ec8\u6b62\u5f53\u524d\u5faa\u73af\uff0c\u65e0\u8bba\u5faa\u73af\u6761\u4ef6\u662f\u5426\u6ee1\u8db3\u3002<\/p>\n\n\n\n
              \u793a\u4f8b\uff1a\u4f7f\u7528 break<\/code> \u8bed\u53e5<\/strong><\/h4>\n\n\n\n
              #include <iostream>\nusing namespace std;\n\nint main() {\n    for (int i = 0; i < 10; i++) {\n        if (i == 5) {\n            break;  \/\/ \u5f53 i \u7b49\u4e8e 5 \u65f6\u9000\u51fa\u5faa\u73af\n        }\n        cout << \"i: \" << i << endl;\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n
              \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
              i: 0\ni: 1\ni: 2\ni: 3\ni: 4<\/code><\/pre>\n\n\n\n
                \n
              • \u5f53 i<\/code> \u7b49\u4e8e 5 \u65f6\uff0cbreak<\/code> \u8bed\u53e5\u7ec8\u6b62\u4e86\u5faa\u73af\u3002<\/li>\n<\/ul>\n\n\n\n
                4.2 continue<\/code> \u8bed\u53e5<\/strong><\/h3>\n\n\n\n
                continue<\/code> \u8bed\u53e5\u7528\u4e8e\u8df3\u8fc7\u5f53\u524d\u5faa\u73af\u4e2d\u7684\u5269\u4f59\u90e8\u5206\uff0c\u76f4\u63a5\u8fdb\u5165\u4e0b\u4e00\u6b21\u5faa\u73af\u7684\u5224\u65ad\u3002<\/p>\n\n\n\n
                \u793a\u4f8b\uff1a\u4f7f\u7528 continue<\/code> \u8bed\u53e5<\/strong><\/h4>\n\n\n\n
                #include <iostream>\nusing namespace std;\n\nint main() {\n    for (int i = 0; i < 10; i++) {\n        if (i == 5) {\n            continue;  \/\/ \u8df3\u8fc7 i == 5 \u7684\u90a3\u6b21\u5faa\u73af\n        }\n        cout << \"i: \" << i << endl;\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n
                \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
                i: 0\ni: 1\ni: 2\ni: 3\ni: 4\ni: 6\ni: 7\ni: 8\ni: 9<\/code><\/pre>\n\n\n\n
                  \n
                • \u5f53 i<\/code> \u7b49\u4e8e 5 \u65f6\uff0ccontinue<\/code> \u8bed\u53e5\u8df3\u8fc7\u4e86\u672c\u6b21\u5faa\u73af\uff0c\u76f4\u63a5\u8fdb\u5165\u4e0b\u4e00\u6b21\u5faa\u73af\u3002<\/li>\n<\/ul>\n\n\n\n
                  4.3 goto<\/code> \u8bed\u53e5<\/strong><\/h3>\n\n\n\n
                  goto<\/code> \u8bed\u53e5\u7528\u4e8e\u65e0\u6761\u4ef6\u5730\u8df3\u8f6c\u5230\u7a0b\u5e8f\u4e2d\u7684\u5176\u4ed6\u4f4d\u7f6e\u3002\u5b83\u901a\u5e38\u88ab\u8ba4\u4e3a\u662f\u4e0d\u63a8\u8350\u4f7f\u7528\u7684\uff0c\u9664\u975e\u5728\u67d0\u4e9b\u7279\u5b9a\u60c5\u51b5\u4e0b\uff0c\u56e0\u4e3a\u5b83\u53ef\u80fd\u4f7f\u4ee3\u7801\u53d8\u5f97\u96be\u4ee5\u7406\u89e3\u548c\u7ef4\u62a4\u3002<\/p>\n\n\n\n
                  \u793a\u4f8b\uff1a\u4f7f\u7528 goto<\/code> \u8bed\u53e5<\/strong><\/h4>\n\n\n\n
                  #include <iostream>\nusing namespace std;\n\nint main() {\n    int i = 0;\n    label:\n    cout << \"i: \" << i << endl;\n    i++;\n    if (i < 5) {\n        goto label;  \/\/ \u8df3\u56de label\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n
                  \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n
                  i: 0\ni: 1\ni: 2\ni: 3\ni: 4<\/code><\/pre>\n\n\n\n
                    \n
                  • goto<\/code> \u8bed\u53e5\u8df3\u8f6c\u5230\u6807\u8bb0 label<\/code>\uff0c\u4ece\u800c\u5b9e\u73b0\u5faa\u73af\u6548\u679c\u3002<\/li>\n<\/ul>\n\n\n\n
                    \n\n\n\n
                    5. \u603b\u7ed3<\/strong><\/h2>\n\n\n\n
                    C++ \u63d0\u4f9b\u4e86\u4e09\u79cd\u5e38\u7528\u7684\u5faa\u73af\u7ed3\u6784\uff1afor<\/code>\u3001while<\/code> \u548c do-while<\/code>\uff0c\u5b83\u4eec\u9002\u7528\u4e8e\u4e0d\u540c\u7684\u573a\u666f\u3002for<\/code> \u5faa\u73af\u901a\u5e38\u7528\u4e8e\u5df2\u77e5\u5faa\u73af\u6b21\u6570\u7684\u573a\u666f\uff0cwhile<\/code> \u548c do-while<\/code> \u5faa\u73af\u5219\u7528\u4e8e\u9700\u8981\u5224\u65ad\u6761\u4ef6\u7684\u573a\u666f\u3002\u6b64\u5916\uff0c\u5faa\u73af\u63a7\u5236\u8bed\u53e5\uff08\u5982 break<\/code>\u3001continue<\/code> \u548c goto<\/code>\uff09\u53ef\u4ee5\u5e2e\u52a9\u63a7\u5236\u5faa\u73af\u7684\u6d41\u5411\u3002<\/p>\n\n\n\n
                    \u5faa\u73af\u7c7b\u578b<\/th>\u8bed\u6cd5<\/th>\u4f7f\u7528\u573a\u666f<\/th><\/tr><\/thead>
                    for<\/code> \u5faa\u73af<\/td>for (initialization; condition; update) {}<\/code><\/td>\u5df2\u77e5\u5faa\u73af\u6b21\u6570<\/td><\/tr>
                    while<\/code> \u5faa\u73af<\/td>while (condition) {}<\/code><\/td>\u6761\u4ef6\u5224\u65ad\u4e3a true<\/code> \u65f6\u6267\u884c\u5faa\u73af<\/td><\/tr>
                    do-while<\/code><\/td>do { ... } while (condition);<\/code><\/td>\u81f3\u5c11\u6267\u884c\u4e00\u6b21\u5faa\u73af\uff0c\u9002\u7528\u4e8e\u5148\u6267\u884c\u540e\u5224\u65ad\u7684\u573a\u666f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                    \u901a\u8fc7\u6b63\u786e\u9009\u62e9\u5faa\u73af\u7ed3\u6784\u548c\u63a7\u5236\u8bed\u53e5\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u7a0b\u5e8f\u7684\u6267\u884c\u6d41\u7a0b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                    \u5faa\u73af\u662f C++ \u4e2d\u7528\u4e8e\u91cd\u590d\u6267\u884c\u4e00\u6bb5\u4ee3\u7801\u7684\u7ed3\u6784\u3002C++ \u63d0\u4f9b\u4e86\u4e09\u79cd\u4e3b\u8981\u7684\u5faa\u73af\u7ed3\u6784\uff1afor \u5faa\u73af\u3001while \u5faa\u73af […]<\/p>\n","protected":false},"author":1,"featured_media":3254,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[81],"tags":[],"class_list":["post-3253","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3253","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3253"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3253\/revisions"}],"predecessor-version":[{"id":3255,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3253\/revisions\/3255"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3254"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3253"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3253"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}