{"id":112,"date":"2010-07-15T02:29:43","date_gmt":"2010-07-14T18:29:43","guid":{"rendered":"http:\/\/blog.mega-zone.org\/?p=112"},"modified":"2010-08-12T01:35:29","modified_gmt":"2010-08-11T17:35:29","slug":"%e5%85%b3%e4%ba%8efpu%e7%9a%84%e7%8c%a5%e7%90%90bug","status":"publish","type":"post","link":"https:\/\/blog.mega-zone.org\/?p=112","title":{"rendered":"\u8bb0\u5f55\u4e00\u4e2aFPU\u7684\u7325\u7410Bug"},"content":{"rendered":"<p>\u8c8c\u4f3cn\u591a\u4eba\u9047\u5230\u8fc7\uff0c\u77e5\u9053\u95ee\u9898\u7684\u539f\u56e0\u4e4b\u540e\u7528\u5408\u9002\u7684\u5173\u952e\u5b57\u53ef\u4ee5\u641c\u51fa\u5f88\u591a\u5e16\u5b50\u3002\u6838\u5fc3\u95ee\u9898\u5f52\u7ed3\u4e3a\uff1afloat\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570\u6709\u6548\u4f4d\u6570\u4e0d\u8db3\uff0c\u800cFPU\u63a7\u5236\u5bc4\u5b58\u5668CTRL\u7684bit8\u548cbit9\u88ab\u7f6e\u4e3a0\u65f6\uff0c\u4f7f\u5f97FPU\u88ab\u5f3a\u5236\u5de5\u4f5c\u5728\u5355\u7cbe\u5ea6(24bit)\u6a21\u5f0f\uff0c\u5bfc\u81f4\u7ed3\u679c\u51fa\u9519\u3002<\/p>\n<p>\u8d77\u56e0\u662f\u4e00\u4e2a\u6734\u7d20\u7684string\u8f6c\u6d6e\u70b9\u6570\u51fd\u6570\uff0c\u7531\u4e8e\u8f93\u5165\u6570\u636e\u7684\u8303\u56f4\u88ab\u8bbe\u5b9a\u57280~1,000,000\u4e14\u5305\u542b\u4e24\u4f4d\u5c0f\u6570\uff0c\u6240\u4ee5\u6700\u521d\u7684\u7248\u672c\u4f7f\u7528float\u50a8\u5b58\u7ed3\u679c\u5c31\u4f1a\u5bfc\u81f4\u7cbe\u5ea6\u4e0d\u8db3\u3002\u53d1\u73b0\u95ee\u9898\u4e4b\u540e\uff0c\u7b2c\u4e00\u53cd\u5e94\u5c31\u662f\u91c7\u7528double\u6765\u50a8\u5b58\uff0c\u7406\u8bba\u4e0a\u4e0d\u4f1a\u51fa\u9519\u4e86\u3002\u7ed3\u679c\u795e\u5947\u7684\u4e8b\u60c5\u53d1\u751f\u4e86\uff0c\u6539\u6210double\u4e4b\u540e\u7cbe\u5ea6\u8fd8\u662f\u4e0d\u8db3\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u7701\u7565\u6389\u5404\u79cd\u65e0\u7528\u5904\u7684\u731c\u60f3\uff0c\u518d\u53bb\u6389\u5176\u4ed6\u7684\u903b\u8f91\uff0c\u8fd9\u4e2a\u51fd\u6570\u5176\u5b9e\u5c31\u8fd9\u4e48\u4e00\u884c\uff1a<\/p>\n<p><strong>double foo( int input ) { return (double)input \/ 100; 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