{"id":791,"date":"2025-04-21T16:54:47","date_gmt":"2025-04-21T08:54:47","guid":{"rendered":"https:\/\/www.hyy.net\/?p=791"},"modified":"2025-04-21T16:54:47","modified_gmt":"2025-04-21T08:54:47","slug":"csharp-decimal-float-double","status":"publish","type":"post","link":"https:\/\/diji.net\/?p=791","title":{"rendered":"C# \u4e2d decimal\u3001float \u548c double \u7684\u4f7f\u7528\u6307\u5357"},"content":{"rendered":"<p>\u4e0d\u518d\u72af\u9519\uff01C# \u4e2d decimal\u3001float \u548c double \u7684\u4f7f\u7528\u6307\u5357\uff08\u57fa\u7840\uff09<\/p>\n<h3>\u524d\u8a00<\/h3>\n<p>\u5728 C# \u7f16\u7a0b\u4e2d\uff0c\u6211\u4eec\u5e38\u5e38\u9700\u8981\u5904\u7406\u5e26\u5c0f\u6570\u70b9\u7684\u6570\u503c\uff0c\u6bd4\u5982\u5728\u8ba1\u7b97\u5546\u54c1\u4ef7\u683c\u3001\u79d1\u5b66\u8ba1\u7b97\u6216\u662f\u5904\u7406\u5750\u6807\u70b9\u65f6\uff0c\u8fd9\u65f6\u5c31\u4f1a\u7528\u5230\u4e09\u79cd\u5e38\u89c1\u7684\u6d6e\u70b9\u6570\u7c7b\u578b\uff1adecimal\u3001float \u548c double\u3002\u867d\u7136\u5b83\u4eec\u770b\u8d77\u6765\u5f88\u76f8\u4f3c\uff0c\u4f46\u5728\u4f7f\u7528\u65f6\uff0c\u5b83\u4eec\u7684\u7cbe\u5ea6\u3001\u5b58\u50a8\u548c\u9002\u7528\u573a\u666f\u90fd\u6709\u663e\u8457\u533a\u522b\u3002\u4eca\u5929\u6211\u4eec\u5c31\u6765\u804a\u804a\u8fd9\u4e09\u79cd\u6570\u636e\u7c7b\u578b\u7684\u533a\u522b\uff0c\u770b\u770b\u5b83\u4eec\u5206\u522b\u9002\u5408\u5728\u54ea\u4e9b\u573a\u666f\u4e2d\u4f7f\u7528\u3002<\/p>\n<h3>1. \u57fa\u672c\u6982\u5ff5<\/h3>\n<ul>\n<li>float\uff08\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff09\uff1a\u5360\u7528 32 \u4f4d\u5b58\u50a8\u7a7a\u95f4\uff0c\u901a\u5e38\u7528\u4e8e\u90a3\u4e9b\u5bf9\u7cbe\u5ea6\u8981\u6c42\u4e0d\u9ad8\u4f46\u9700\u8981\u8282\u7701\u5185\u5b58\u7684\u573a\u666f\uff0c\u6bd4\u5982\u6e38\u620f\u5f00\u53d1\u4e2d\u7684\u5750\u6807\u8ba1\u7b97\u3002\u5b9a\u4e49\u65f6\u9700\u8981\u5728\u6570\u5b57\u540e\u52a0 f \u6216 F\uff0c\u6bd4\u5982\uff1afloat x = 3.14f;\u3002<\/li>\n<li>double\uff08\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff09\uff1a\u5360\u7528 64 \u4f4d\u5b58\u50a8\u7a7a\u95f4\uff0c\u662f C# \u4e2d\u7684\u9ed8\u8ba4\u6d6e\u70b9\u7c7b\u578b\uff0c\u7cbe\u5ea6\u6bd4 float \u9ad8\uff0c\u9002\u7528\u4e8e\u5927\u90e8\u5206\u9700\u8981\u5c0f\u6570\u8ba1\u7b97\u7684\u573a\u5408\u3002\u901a\u5e38\u4e0d\u9700\u8981\u52a0\u540e\u7f00\uff0c\u4f46\u53ef\u4ee5\u7528 d \u6216 D \u540e\u7f00\u6765\u6807\u8bc6\uff0c\u6bd4\u5982\uff1adouble y = 3.14;\u3002<\/li>\n<li>decimal\uff08\u9ad8\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff09\uff1a\u5360\u7528 128 \u4f4d\u5b58\u50a8\u7a7a\u95f4\uff0c\u4e13\u4e3a\u8d22\u52a1\u548c\u8d27\u5e01\u8ba1\u7b97\u8bbe\u8ba1\uff0c\u7cbe\u5ea6\u8fdc\u9ad8\u4e8e float \u548c double\uff0c\u9002\u7528\u4e8e\u5bf9\u7cbe\u5ea6\u8981\u6c42\u6781\u9ad8\u7684\u573a\u666f\u3002\u5b9a\u4e49\u65f6\u9700\u8981\u5728\u6570\u5b57\u540e\u52a0 m \u6216 M\uff0c\u6bd4\u5982\uff1adecimal z = 3.14m;\u3002<\/li>\n<\/ul>\n<h3>2. \u7cbe\u5ea6\u4e0e\u8303\u56f4<\/h3>\n<p>\u7406\u89e3\u5b83\u4eec\u7684\u7cbe\u5ea6\u548c\u8303\u56f4\u5f88\u91cd\u8981\uff0c\u8fd9\u76f4\u63a5\u5f71\u54cd\u5230\u6211\u4eec\u9009\u7528\u54ea\u79cd\u6570\u636e\u7c7b\u578b\u3002<\/p>\n<ul>\n<li>float\uff1a\u7ea6\u6709 6-7 \u4f4d\u6709\u6548\u6570\u5b57\uff0c\u6570\u503c\u8303\u56f4\u5927\uff0c\u4f46\u7cbe\u5ea6\u8f83\u4f4e\u3002<\/li>\n<li>double\uff1a\u7ea6\u6709 15-16 \u4f4d\u6709\u6548\u6570\u5b57\uff0c\u662f C# \u4e2d\u7684\u9ed8\u8ba4\u5c0f\u6570\u7c7b\u578b\uff0c\u5e73\u8861\u4e86\u8303\u56f4\u548c\u7cbe\u5ea6\u3002<\/li>\n<li>decimal\uff1a\u7ea6\u6709 28-29 \u4f4d\u6709\u6548\u6570\u5b57\uff0c\u4e13\u4e3a\u5904\u7406\u6781\u9ad8\u7cbe\u5ea6\u8981\u6c42\u7684\u60c5\u51b5\uff0c\u6bd4\u5982\u91d1\u878d\u5e94\u7528\u4e2d\u7684\u8d27\u5e01\u8ba1\u7b97\u3002<\/li>\n<\/ul>\n<h3>3. \u5b9e\u9645\u4f7f\u7528\u573a\u666f<\/h3>\n<ul>\n<li>float \u4f7f\u7528\u573a\u666f\uff1a\u9002\u5408\u5bf9\u7cbe\u5ea6\u8981\u6c42\u4e0d\u9ad8\u7684\u56fe\u5f62\u8ba1\u7b97\uff0c\u5982 3D \u6e38\u620f\u5f00\u53d1\u4e2d\u7684\u5750\u6807\u548c\u989c\u8272\u8ba1\u7b97\u3002\u6bd4\u5982\uff0c\u6211\u4eec\u5728\u6e32\u67d3\u4e00\u4e2a\u590d\u6742\u7684 3D \u6a21\u578b\u65f6\uff0c\u5750\u6807\u7684\u8f7b\u5fae\u8bef\u5dee\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\uff0c\u800c\u4f7f\u7528 float \u53ef\u4ee5\u51cf\u5c11\u5185\u5b58\u6d88\u8017\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li>double \u4f7f\u7528\u573a\u666f\uff1a\u9002\u7528\u4e8e\u79d1\u5b66\u8ba1\u7b97\u3001\u7269\u7406\u4eff\u771f\u3001\u5929\u4f53\u8fd0\u7b97\u7b49\u3002\u5927\u90e8\u5206\u9700\u8981\u5c0f\u6570\u7684\u573a\u666f\u90fd\u53ef\u4ee5\u7528 double\uff0c\u6bd4\u5982\u8ba1\u7b97\u4e00\u4e2a\u7269\u4f53\u7684\u8f68\u8ff9\uff0c\u8fd9\u65f6\u5019\u65e2\u9700\u8981\u8f83\u5927\u7684\u6570\u503c\u8303\u56f4\uff0c\u4e5f\u9700\u8981\u4e00\u5b9a\u7684\u7cbe\u5ea6\u3002<\/li>\n<li>decimal \u4f7f\u7528\u573a\u666f\uff1a\u9002\u5408\u91d1\u878d\u8ba1\u7b97\u3001\u4f1a\u8ba1\u7cfb\u7edf\u7b49\u5bf9\u6570\u503c\u7cbe\u5ea6\u8981\u6c42\u6781\u9ad8\u7684\u60c5\u51b5\u3002\u6bd4\u5982\uff0c\u5728\u8ba1\u7b97\u5546\u54c1\u7684\u603b\u4ef7\u65f6\uff0c\u6211\u4eec\u9700\u8981\u786e\u4fdd\u6bcf\u4e00\u5206\u94b1\u7684\u7cbe\u5ea6\uff0c\u4e0d\u7136\u5c31\u53ef\u80fd\u5bfc\u81f4\u8d22\u52a1\u8ba1\u7b97\u9519\u8bef\u3002<\/li>\n<\/ul>\n<h3>4. \u8ba1\u7b97\u6848\u4f8b\u5bf9\u6bd4<\/h3>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u8ba1\u7b97\u6848\u4f8b\u6765\u611f\u53d7\u8fd9\u4e9b\u7c7b\u578b\u4e4b\u95f4\u7684\u5dee\u5f02\u3002<\/p>\n<pre><code>class Program\n{\n    static void Main()\n    {\n        float floatResult = 1.0f \/ 3.0f;\n        double doubleResult = 1.0 \/ 3.0;\n        decimal decimalResult = 1.0m \/ 3.0m;\n\n        Console.WriteLine($&quot;Float: {floatResult}&quot;);   \/\/ \u8f93\u51fa\uff1a0.3333333\n        Console.WriteLine($&quot;Double: {doubleResult}&quot;); \/\/ \u8f93\u51fa\uff1a0.3333333333333333\n        Console.WriteLine($&quot;Decimal: {decimalResult}&quot;); \/\/ \u8f93\u51fa\uff1a0.3333333333333333333333333333\n    }\n}<\/code><\/pre>\n<p>\u901a\u8fc7\u8fd9\u4e2a\u7b80\u5355\u7684 1 \u9664\u4ee5 3 \u7684\u4f8b\u5b50\u53ef\u4ee5\u770b\u5230\uff1a<\/p>\n<ul>\n<li>float \u4fdd\u7559\u7684\u4f4d\u6570\u5f88\u5c11\uff0c\u4ec5\u4ec5 6-7 \u4f4d\u6709\u6548\u6570\u5b57\uff0c\u8db3\u591f\u7b80\u5355\u7684\u56fe\u5f62\u8fd0\u7b97\u3002<\/li>\n<li>double \u4fdd\u7559\u4e86\u5927\u7ea6 15-16 \u4f4d\u6709\u6548\u6570\u5b57\uff0c\u53ef\u4ee5\u6ee1\u8db3\u5927\u90e8\u5206\u79d1\u5b66\u8ba1\u7b97\u3002<\/li>\n<li>decimal \u5219\u51e0\u4e4e\u6ca1\u6709\u7cbe\u5ea6\u635f\u5931\uff0c\u4fdd\u7559\u4e86 28-29 \u4f4d\u6709\u6548\u6570\u5b57\uff0c\u975e\u5e38\u9002\u5408\u8d27\u5e01\u8ba1\u7b97\u3002<\/li>\n<\/ul>\n<h3>5. \u4e3a\u4ec0\u4e48\u9009\u62e9\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\uff1f<\/h3>\n<p>\u9009\u62e9 float \u662f\u56e0\u4e3a\u5b83\u5360\u7528\u5185\u5b58\u5c11\uff0c\u901f\u5ea6\u5feb\uff0c\u975e\u5e38\u9002\u5408\u5927\u91cf\u6570\u636e\u7684\u7b80\u5355\u8ba1\u7b97\uff0c\u5982\u6e38\u620f\u4e2d\u7684\u6e32\u67d3\u3002<\/p>\n<p>\u9009\u62e9 double \u662f\u56e0\u4e3a\u5b83\u662f\u5927\u90e8\u5206\u5e94\u7528\u7684\u9ed8\u8ba4\u9009\u62e9\uff0c\u63d0\u4f9b\u4e86\u8db3\u591f\u7684\u7cbe\u5ea6\u548c\u8ba1\u7b97\u6548\u7387\uff0c\u9002\u5408\u901a\u7528\u7684\u6570\u5b66\u8ba1\u7b97\u3002<\/p>\n<p>\u9009\u62e9 decimal \u5219\u662f\u56e0\u4e3a\u5b83\u80fd\u5904\u7406\u975e\u5e38\u7cbe\u786e\u7684\u5c0f\u6570\u8fd0\u7b97\uff0c\u5c24\u5176\u662f\u5728\u6d89\u53ca\u8d22\u52a1\u548c\u8d27\u5e01\u7684\u573a\u5408\uff0c\u907f\u514d\u4e86\u6d6e\u70b9\u6570\u7684\u7cbe\u5ea6\u95ee\u9898\u3002<\/p>\n<h3>\u603b\u7ed3<\/h3>\n<p>\u5728 C# \u4e2d\uff0cfloat\u3001double \u548c decimal \u4e09\u79cd\u6570\u636e\u7c7b\u578b\u5404\u6709\u5176\u7528\u9014\u3002\u7406\u89e3\u5b83\u4eec\u7684\u7cbe\u5ea6\u548c\u4f7f\u7528\u573a\u666f\uff0c\u80fd\u591f\u5e2e\u52a9\u4f60\u5728\u7f16\u7a0b\u4e2d\u505a\u51fa\u66f4\u5408\u9002\u7684\u9009\u62e9\u3002\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u5e2e\u52a9\u4f60\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u8fd9\u4e09\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5199\u51fa\u66f4\u52a0\u53ef\u9760\u7684\u4ee3\u7801\uff01\u5927\u5bb6\u4f7f\u7528float\u3001double \u548c decimal \u573a\u666f\u6709\u90a3\u4e9b?\u6b22\u8fce\u7559\u8a00\u8ba8\u8bba\uff01<\/p>\n<p><a href=\"https:\/\/mp.weixin.qq.com\/s?__biz=MzI2NDE1MDE1MQ==&amp;mid=2650859746&amp;idx=1&amp;sn=53123b677fa22fb9454df73623ddf3c2&amp;chksm=f145450ac632cc1ca8c20de66439fd926238f7dbd102c3b66e847301d600e884e86838f38175&amp;cur_album_id=1924294891300290563&amp;scene=190#rd\">https:\/\/mp.weixin.qq.com\/s?__biz=MzI2NDE1MDE1MQ==&mid=2650859746&idx=1&sn=53123b677fa22fb9454df73623ddf3c2&chksm=f145450ac632cc1ca8c20de66439fd926238f7dbd102c3b66e847301d600e884e86838f38175&cur_album_id=1924294891300290563&scene=190#rd<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0d\u518d\u72af\u9519\uff01C# \u4e2d decimal\u3001float \u548c double \u7684\u4f7f\u7528\u6307\u5357\uff08\u57fa\u7840\uff09 \u524d\u8a00 \u5728 C# \u7f16\u7a0b\u4e2d\uff0c\u6211\u4eec\u5e38\u5e38\u9700\u8981\u5904\u7406\u5e26\u5c0f\u6570\u70b9\u7684\u6570\u503c\uff0c\u6bd4\u5982\u5728\u8ba1\u7b97\u5546\u54c1\u4ef7\u683c\u3001\u79d1\u5b66\u8ba1\u7b97\u6216\u662f\u5904\u7406\u5750\u6807\u70b9\u65f6\uff0c\u8fd9\u65f6\u5c31\u4f1a\u7528\u5230\u4e09\u79cd\u5e38\u89c1\u7684\u6d6e\u70b9\u6570\u7c7b\u578b\uff1adecimal\u3001float \u548c double\u3002\u867d\u7136\u5b83\u4eec\u770b\u8d77\u6765\u5f88\u76f8\u4f3c\uff0c\u4f46\u5728\u4f7f\u7528\u65f6\uff0c\u5b83\u4eec\u7684\u7cbe\u5ea6\u3001\u5b58\u50a8\u548c\u9002\u7528\u573a\u666f\u90fd\u6709\u663e\u8457\u533a\u522b\u3002\u4eca\u5929\u6211\u4eec\u5c31\u6765\u804a\u804a\u8fd9\u4e09\u79cd\u6570\u636e\u7c7b\u578b\u7684\u533a\u522b\uff0c\u770b\u770b\u5b83\u4eec\u5206\u522b\u9002\u5408\u5728\u54ea\u4e9b\u573a\u666f\u4e2d\u4f7f\u7528\u3002 1. \u57fa\u672c\u6982\u5ff5 float\uff08\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff09\uff1a\u5360\u7528 32 \u4f4d\u5b58\u50a8\u7a7a\u95f4\uff0c\u901a\u5e38\u7528\u4e8e\u90a3\u4e9b\u5bf9\u7cbe\u5ea6\u8981\u6c42\u4e0d\u9ad8\u4f46\u9700\u8981\u8282\u7701\u5185\u5b58\u7684\u573a\u666f\uff0c\u6bd4\u5982\u6e38\u620f\u5f00\u53d1\u4e2d\u7684\u5750\u6807\u8ba1\u7b97\u3002\u5b9a\u4e49\u65f6\u9700\u8981\u5728\u6570\u5b57\u540e\u52a0 f \u6216 F\uff0c\u6bd4\u5982\uff1afloat x = 3.14f;\u3002 double\uff08\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff09\uff1a\u5360\u7528 64 \u4f4d\u5b58\u50a8\u7a7a\u95f4\uff0c\u662f C# \u4e2d\u7684\u9ed8\u8ba4\u6d6e\u70b9\u7c7b\u578b\uff0c\u7cbe\u5ea6\u6bd4 float \u9ad8\uff0c\u9002\u7528\u4e8e\u5927\u90e8\u5206\u9700\u8981\u5c0f\u6570\u8ba1\u7b97\u7684\u573a\u5408\u3002\u901a\u5e38\u4e0d\u9700\u8981\u52a0\u540e\u7f00\uff0c\u4f46\u53ef\u4ee5\u7528 d \u6216 D \u540e\u7f00\u6765\u6807\u8bc6\uff0c\u6bd4\u5982\uff1adouble y = 3.14;\u3002 decimal\uff08\u9ad8\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff09\uff1a\u5360\u7528 128 \u4f4d\u5b58\u50a8\u7a7a\u95f4\uff0c\u4e13\u4e3a\u8d22\u52a1\u548c\u8d27\u5e01\u8ba1\u7b97\u8bbe\u8ba1\uff0c\u7cbe\u5ea6\u8fdc\u9ad8\u4e8e float \u548c double\uff0c\u9002\u7528\u4e8e\u5bf9\u7cbe\u5ea6\u8981\u6c42\u6781\u9ad8\u7684\u573a\u666f\u3002\u5b9a\u4e49\u65f6\u9700\u8981\u5728\u6570\u5b57\u540e\u52a0 m \u6216 M\uff0c\u6bd4\u5982\uff1adecimal z = 3.14m;\u3002 2. \u7cbe\u5ea6\u4e0e\u8303\u56f4 \u7406\u89e3\u5b83\u4eec\u7684\u7cbe\u5ea6\u548c\u8303\u56f4\u5f88\u91cd\u8981\uff0c\u8fd9\u76f4\u63a5\u5f71\u54cd\u5230\u6211\u4eec\u9009\u7528\u54ea\u79cd\u6570\u636e\u7c7b\u578b\u3002 float\uff1a\u7ea6\u6709 6-7 \u4f4d\u6709\u6548\u6570\u5b57\uff0c\u6570\u503c\u8303\u56f4\u5927\uff0c\u4f46\u7cbe\u5ea6\u8f83\u4f4e\u3002 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