{"id":63656,"date":"2023-11-27T21:48:22","date_gmt":"2023-11-27T13:48:22","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=63656"},"modified":"2023-11-27T21:48:36","modified_gmt":"2023-11-27T13:48:36","slug":"%e7%bc%96%e7%a8%8b%e4%b8%ad%e7%9a%84%e3%80%8c%e9%ad%94%e6%95%b0%e3%80%8d%ef%bc%88magic-number%ef%bc%89%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/63656.html","title":{"rendered":"\u7f16\u7a0b\u4e2d\u7684\u300c\u9b54\u6570\u300d\uff08magic number\uff09\u662f\u4ec0\u4e48\u610f\u601d"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote\">\n<p>\u300c\u9b54\u6570\u300d\u6307\u7684\u662f\u5728\u4ee3\u7801\u4e2d\u76f4\u63a5\u51fa\u73b0\u7684\u672a\u7ecf\u89e3\u91ca\u7684\u6570\u5b57\u5e38\u91cf\u3002\u5b83\u4eec\u53ef\u80fd\u5bfc\u81f4\u4ee3\u7801\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\u7684\u95ee\u9898\uff0c\u56e0\u6b64\u5728\u7f16\u7a0b\u4e2d\u5e94\u5c3d\u91cf\u907f\u514d\u3002\u4f7f\u7528\u6709\u610f\u4e49\u7684\u5e38\u91cf\u6216\u679a\u4e3e\u7c7b\u578b\u6765\u4ee3\u66ff\u300c\u9b54\u6570\u300d\uff0c\u5e76\u7ed3\u5408\u5408\u9002\u7684\u6ce8\u91ca\u6765\u89e3\u91ca\u6570\u5b57\u7684\u542b\u4e49\uff0c\u6709\u52a9\u4e8e\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u8bfb\u6027\u3002\u5728\u6781\u5c11\u6570\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u6570\u5b57\u4e5f\u662f\u5408\u7406\u7684\uff0c\u4f46\u4e5f\u9700\u8981\u786e\u4fdd\u6dfb\u52a0\u5fc5\u8981\u7684\u6ce8\u91ca\u6765\u89e3\u91ca\u5176\u542b\u4e49\u3002<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">1.\u300c\u9b54\u6570\u300d\u7684\u6982\u5ff5<\/h2>\n\n\n\n<p>\u300c\u9b54\u6570\u300d\uff08magic number\uff09\u901a\u5e38\u6307\u7684\u662f\u4ee3\u7801\u4e2d\u76f4\u63a5\u51fa\u73b0\u7684\u672a\u7ecf\u89e3\u91ca\u7684\u6570\u5b57\u6216\u5b57\u9762\u91cf\u3002\u8fd9\u4e9b\u6570\u5b57\u8c8c\u4f3c\u6beb\u65e0\u610f\u4e49\uff0c\u7f3a\u4e4f\u89e3\u91ca\u548c\u63cf\u8ff0\uff0c\u76f4\u63a5\u786c\u7f16\u7801\u5728\u4ee3\u7801\u4e2d\uff0c\u4f8b\u5982\uff1a`int x = 10;` \u4e2d\u7684\u6570\u5b5710 \u5c31\u662f\u4e00\u4e2a\u300c\u9b54\u6570\u300d\u3002\u5b83\u6ca1\u6709\u6ce8\u91ca\u6216\u8005\u8bf4\u660e\uff0c\u96be\u4ee5\u7406\u89e3\u5176\u542b\u4e49\u548c\u4f5c\u7528\u3002\u8fd9\u4e9b\u6570\u5b57\u50cf\u662f\u4ece\u7a7a\u6c14\u4e2d\u51ed\u7a7a\u51fa\u73b0\uff0c\u7ed9\u4eba\u4e00\u79cd\u795e\u79d8\u548c\u4e0d\u53ef\u89e3\u7684\u611f\u89c9\uff0c\u56e0\u6b64\u88ab\u79f0\u4e3a\u300c\u9b54\u6570\u300d\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.\u300c\u9b54\u6570\u300d\u5b58\u5728\u7684\u95ee\u9898<\/h2>\n\n\n\n<p>\u300c\u9b54\u6570\u300d\u5b58\u5728\u4e00\u4e9b\u6f5c\u5728\u7684\u95ee\u9898\uff0c\u5176\u4e2d\u6700\u4e3b\u8981\u7684\u662f\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\u3002\u4ee3\u7801\u4e2d\u76f4\u63a5\u4f7f\u7528\u6570\u5b57\uff0c\u7279\u522b\u662f\u6ca1\u6709\u63d0\u4f9b\u6ce8\u91ca\u6216\u89e3\u91ca\u7684\u6570\u5b57\uff0c\u4f1a\u4f7f\u5f97\u4ee3\u7801\u96be\u4ee5\u7406\u89e3\u548c\u7ef4\u62a4\u3002\u5f53\u5176\u4ed6\u5f00\u53d1\u8005\u6216\u4f60\u81ea\u5df1\u5728\u672a\u6765\u56de\u987e\u8fd9\u6bb5\u4ee3\u7801\u65f6\uff0c\u9700\u8981\u82b1\u8d39\u66f4\u591a\u7684\u65f6\u95f4\u548c\u7cbe\u529b\u53bb\u731c\u6d4b\u8fd9\u4e9b\u6570\u5b57\u7684\u542b\u4e49\u548c\u4f5c\u7528\u3002<\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u5982\u679c\u67d0\u4e2a\u300c\u9b54\u6570\u300d\u9700\u8981\u66f4\u6539\uff0c\u90a3\u4e48\u5728\u4ee3\u7801\u7684\u591a\u4e2a\u5730\u65b9\u4fee\u6539\u540c\u4e00\u4e2a\u6570\u5b57\u53ef\u80fd\u4f1a\u5e26\u6765\u98ce\u9669\u3002\u4f8b\u5982\uff0c\u5982\u679c\u5728\u4ee3\u7801\u4e2d\u591a\u6b21\u4f7f\u7528\u6570\u5b57\uff0c\u800c\u540e\u9700\u8981\u4fee\u6539\u8fd9\u4e2a\u6570\u5b57\u7684\u503c\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u5728\u591a\u4e2a\u5730\u65b9\u8fdb\u884c\u540c\u6b65\u4fee\u6539\uff0c\u5bb9\u6613\u51fa\u73b0\u9057\u6f0f\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3.\u5982\u4f55\u907f\u514d\u300c\u9b54\u6570\u300d<\/h2>\n\n\n\n<p>\u907f\u514d\u300c\u9b54\u6570\u300d\u7684\u6700\u4f73\u65b9\u6cd5\u4e4b\u4e00\u662f\u4f7f\u7528\u5e38\u91cf\u6216\u679a\u4e3e\u7c7b\u578b\u3002\u901a\u8fc7\u5c06\u6570\u5b57\u8d4b\u503c\u7ed9\u6709\u610f\u4e49\u7684\u5e38\u91cf\u540d\u79f0\u6216\u8005\u679a\u4e3e\u7c7b\u578b\uff0c\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\u3002\u4f8b\u5982\uff0c\u5c06\u6570\u5b57365 \u8d4b\u503c\u7ed9\u540d\u4e3aDAYS_IN_YEAR 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class=\"wp-block-heading\">4.\u300c\u9b54\u6570\u300d\u7684\u9002\u7528\u573a\u666f<\/h2>\n\n\n\n<p>\u5c3d\u7ba1\u6211\u4eec\u8981\u5c3d\u91cf\u907f\u514d\u5728\u4ee3\u7801\u4e2d\u51fa\u73b0\u672a\u89e3\u91ca\u7684\u6570\u5b57\u5e38\u91cf\uff0c\u4f46\u6709\u65f6\u5019\u4f7f\u7528\u6570\u5b57\u4e5f\u662f\u5408\u7406\u7684\uff0c\u6bd4\u5982\u4e00\u4e9b\u4e34\u65f6\u6027\u3001\u4e0d\u91cd\u8981\u7684\u5e38\u6570\u503c\u6216\u8005\u6d4b\u8bd5\u4ee3\u7801\u4e2d\u7684\u4e00\u4e9b\u8fb9\u754c\u503c\u3002\u5728\u8fd9\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u6570\u5b57\u53ef\u80fd\u662f\u5408\u7406\u7684\uff0c\u4f46\u4ecd\u7136\u5efa\u8bae\u6dfb\u52a0\u5fc5\u8981\u7684\u6ce8\u91ca\u6765\u89e3\u91ca\u8fd9\u4e9b\u6570\u5b57\u7684\u542b\u4e49\u3002<\/p>\n\n\n\n<p><img fetchpriority=\"high\" decoding=\"async\" width=\"484\" height=\"300\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/11\/512195-\u7f16\u7a0b\u4e2d\u7684\u9b54\u6570magicnumber\u662f\u4ec0\u4e48\u610f\u601d.png?x-oss-process=image\/auto-orient,1\/format,webp\" class=\"aligncenter\" alt=\"\u7f16\u7a0b\u4e2d\u7684\u300c\u9b54\u6570\u300d\uff08magic number\uff09\u662f\u4ec0\u4e48\u610f\u601d\" \/><\/p>\n\n\n\n<p><strong>\u5e38\u89c1\u95ee\u7b54\uff1a<\/strong><\/p>\n\n\n\n<ul>\n<li>\u95ee\uff1a\u300c\u9b54\u6570\u300d\u5728\u7f16\u7a0b\u4e2d\u7684\u5178\u578b\u4f8b\u5b50\u662f\u4ec0\u4e48<\/li>\n\n\n\n<li>\u7b54\uff1a\u5728\u7f16\u7a0b\u4e2d\uff0c\u4e00\u4e2a\u7ecf\u5178\u7684\u300c\u9b54\u6570\u300d\u4f8b\u5b50\u53ef\u80fd\u662f\u5728\u4ee3\u7801\u4e2d\u51fa\u73b0\u7684\u672a\u7ecf\u89e3\u91ca\u7684\u6570\u5b57\uff0c\u6bd4\u5982\u76f4\u63a5\u4f7f\u7528\u6570\u5b570\u30011 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