{"id":203228,"date":"2025-05-22T11:01:46","date_gmt":"2025-05-22T03:01:46","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203228\/"},"modified":"2025-05-22T11:01:46","modified_gmt":"2025-05-22T03:01:46","slug":"%e5%a6%82%e6%9e%9c%e9%9c%80%e8%a6%81%e5%87%86%e7%a1%ae%e7%ad%94%e6%a1%88%ef%bc%8c%e8%af%b7%e9%81%bf%e5%85%8d%e6%b5%ae%e5%8a%a8%e5%92%8c%e5%8f%8c%e7%b2%be%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203228\/","title":{"rendered":"\u5982\u679c\u9700\u8981\u51c6\u786e\u7b54\u6848\uff0c\u8bf7\u907f\u514d\u6d6e\u52a8\u548c\u53cc\u7cbe\u5ea6"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u5982\u679c\u9700\u8981\u51c6\u786e\u7b54\u6848\uff0c\u8bf7\u907f\u514d\u6d6e\u52a8\u548c\u53cc\u7cbe\u5ea6<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span>    <\/p>\n<p><span style=\"color: #222222;, sans-serif;background-color: #FFFFFF\">\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898<span style=\"color: #222222;, sans-serif;background-color: #FFFFFF\">\u662f<\/span><span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5982\u679c\u9700\u8981\u51c6\u786e\u7b54\u6848\uff0c\u8bf7\u907f\u514d\u6d6e\u52a8\u548c\u53cc\u7cbe\u5ea6\u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8e<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241102\/17305315766725d0f8bbdce.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u6d6e\u52a8\u548c\u53cc\u7cbe\u5ea6\u95ee\u9898\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e13\u4e3a\u79d1\u5b66\u548c\u6570\u5b66\u8ba1\u7b97\u800c\u8bbe\u8ba1\uff0c\u6267\u884c\u4e8c\u8fdb\u5236\u6d6e\u70b9\u8fd0\u7b97\u3002<\/li>\n<li>\u4e0d\u9002\u5408\u8d27\u5e01\u8ba1\u7b97\u6216\u9700\u8981\u7cbe\u786e\u7b54\u6848\u7684\u60c5\u51b5\u3002<\/li>\n<li>\u5b83\u4eec\u65e0\u6cd5\u51c6\u786e\u8868\u793a 10 \u7684\u8d1f\u5e42\uff0c\u4f8b\u5982 0.1\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b1\uff1a<\/strong><br \/> \u51cf\u53bb\u7f8e\u5143\u91d1\u989d\u65f6\u8ba1\u7b97\u9519\u8bef\uff1a<\/p>\n<pre>system.out.println(1.03 - 0.42);  \/\/ resultado: 0.6100000000000001\n\n<\/pre>\n<p><strong>\u793a\u4f8b2\uff1a<\/strong><br \/> \u4ee5\u6bcf\u4ef6 10 \u7f8e\u5206\u7684\u4ef7\u683c\u8d2d\u4e70 9 \u4ef6\u5546\u54c1\u65f6\u51fa\u9519\uff1a<\/p>\n<pre>system.out.println(1.00 - 9 * 0.10);  \/\/ resultado: 0.09999999999999998\n\n<\/pre>\n<p>\u5373\u4f7f\u56db\u820d\u4e94\u5165\uff0c\u9519\u8bef\u4ecd\u7136\u5b58\u200b\u200b\u5728\u3002<br \/> \u7d2f\u8fdb\u8ba1\u7b97\u5b58\u5728\u95ee\u9898\uff0c\u4f8b\u5982\u4ee5 0.10 \u5230 1.00 \u7684\u589e\u91cf\u4ef7\u683c\u8d2d\u4e70\u7cd6\u679c\u65f6\u3002<\/p>\n<p><strong>\u793a\u4f8b 3\uff1a<\/strong><br \/> \u6ca1\u94b1\u4e70\u7cd6\u679c\u65f6\u72af\u7684\u9519\u8bef\uff1a<\/p>\n<pre>double funds = 1.00;\nfor (double price = 0.10; funds &gt;= price; price += 0.10) {\n    funds -= price;\n}\nsystem.out.println(funds);  \/\/ resultado: 0.3999999999999999\n\n<\/pre>\n<p><strong>\u89e3\u51b3\u65b9\u6848 1\uff1a\u4f7f\u7528 bigdecimal<\/strong><\/p>\n<ul>\n<li>\u975e\u5e38\u9002\u5408\u8d22\u52a1\u8ba1\u7b97\u548c\u9700\u8981\u7cbe\u786e\u5ea6\u7684\u60c5\u51b5\u3002<\/li>\n<li>\u907f\u514d\u4f7f\u7528 bigdecimal \u7684\u53cc\u6784\u9020\u51fd\u6570\uff0c\u6700\u597d\u4f7f\u7528 string \u6784\u9020\u51fd\u6570\u3002<\/li>\n<\/ul>\n<p>bigdecimal \u793a\u4f8b\uff1a<\/p>\n<pre>bigdecimal funds = new bigdecimal(\"1.00\");\nbigdecimal price = new bigdecimal(\"0.10\");\nint itemsbought = 0;\n\nwhile (funds.compareto(price) &gt;= 0) {\n    funds = funds.subtract(price);\n    price = price.add(new bigdecimal(\"0.10\"));\n    itemsbought++;\n}\nsystem.out.println(itemsbought + \" items bought. money left: \" + funds);  \n\/\/ resultado: 4 items bought. money left: 0.00\n\n<\/pre>\n<p>\u8ba1\u7b97\u73b0\u5728\u5f88\u7cbe\u786e\u3002<\/p>\n<p><strong>bigdecimal \u7684\u7f3a\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528\u8d77\u6765\u4e0d\u5982\u539f\u59cb\u7c7b\u578b\u65b9\u4fbf\u3002<\/li>\n<li>\u901f\u5ea6\u8f83\u6162\uff0c\u5c24\u5176\u662f\u5bf9\u4e8e\u5927\u91cf\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<p><strong>\u89e3\u51b3\u65b9\u6848 2\uff1a\u4f7f\u7528 int \u6216 long<\/strong><\/p>\n<ul>\n<li>\u4e3a\u4e86\u907f\u514d\u51c6\u786e\u6027\u95ee\u9898\uff0c\u8bf7\u4ee5\u7f8e\u5206\u4e3a\u5355\u4f4d\u8fdb\u884c\u8ba1\u7b97\uff0c\u4f7f\u7528 int \u6216 long \u800c\u4e0d\u662f\u4f7f\u7528 double \u7684\u7f8e\u5143\u3002<\/li>\n<\/ul>\n<p>int \u793a\u4f8b\uff08\u4ee5\u5206\u4e3a\u5355\u4f4d\uff09\uff1a<\/p>\n<pre>int funds = 100;  \/\/ 1.00 d\u00f3lar = 100 centavos\nint price = 10;   \/\/ 0.10 d\u00f3lar = 10 centavos\nint itemsBought = 0;\n\nwhile (funds &gt;= price) {\n    funds -= price;\n    price += 10;\n    itemsBought++;\n}\nSystem.out.println(itemsBought + \" items bought. Money left: \" + funds);  \n\/\/ Resultado: 4 items bought. Money left: 0\n\n<\/pre>\n<p>\u8ba1\u7b97\u53c8\u5feb\u53c8\u51c6\u3002<\/p>\n<p><strong>\u7ed3\u8bba\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e0d\u8981\u4f7f\u7528 float \u6216 double \u8fdb\u884c\u9700\u8981\u7cbe\u786e\u7cbe\u5ea6\u7684\u8ba1\u7b97\u3002<\/li>\n<li>\u4f7f\u7528 bigdecimal \u8fdb\u884c\u8d27\u5e01\u8ba1\u7b97\u6216\u9700\u8981\u5c0f\u6570\u7cbe\u5ea6\u7684\u60c5\u51b5\u3002<\/li>\n<li>\u4f7f\u7528 int \u6216 long \u8fdb\u884c\u4e0d\u6d89\u53ca\u5927\u6570\u7684\u91d1\u878d\u8ba1\u7b97\uff0c\u4ee5\u5206\u4e3a\u5355\u4f4d\u8fdb\u884c\u8ba1\u7b97\u3002<\/li>\n<\/ul>\n<p><strong>\u9009\u62e9\uff1a<\/strong><\/p>\n<ul>\n<li>\u5bf9\u4e8e\u6700\u591a 9 \u4f4d\u6570\u5b57\uff0c\u8bf7\u4f7f\u7528 int\u3002<\/li>\n<li>\u5bf9\u4e8e\u6700\u591a 18 \u4f4d\u6570\u5b57\uff0c\u8bf7\u4f7f\u7528 long\u3002<\/li>\n<li>\u5bf9\u4e8e\u8f83\u5927\u6570\u91cf\uff0c\u8bf7\u4f7f\u7528 bigdecimal\u3002<\/li>\n<li>\u6b64\u6458\u8981\u8868\u660e\uff0c\u6839\u636e\u4e0a\u4e0b\u6587\uff0c\u5728 bigdecimal\u3001int \u6216 long \u4e4b\u95f4\u8fdb\u884c\u9009\u62e9\u53ef\u4ee5\u4f18\u5316\u7cbe\u5ea6\u548c\u6027\u80fd\u3002<\/li>\n<\/ul>\n<p>\u4eca\u5929\u5173\u4e8e\u300a\u5982\u679c\u9700\u8981\u51c6\u786e\u7b54\u6848\uff0c\u8bf7\u907f\u514d\u6d6e\u52a8\u548c\u53cc\u7cbe\u5ea6\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n<p>      \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb\u5220\u9664<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u679c\u9700\u8981\u51c6\u786e\u7b54\u6848\uff0c\u8bf7\u907f\u514d\u6d6e\u52a8\u548c\u53cc&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-203228","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203228","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=203228"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203228\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}