{"id":509,"date":"2025-02-02T13:09:08","date_gmt":"2025-02-02T04:09:08","guid":{"rendered":"https:\/\/www.kd2.jp\/memo3\/?p=509"},"modified":"2025-02-02T13:10:10","modified_gmt":"2025-02-02T04:10:10","slug":"c-%e5%9b%9b%e6%8d%a8%e4%ba%94%e5%85%a5%e3%80%81%e5%88%87%e3%82%8a%e4%b8%8a%e3%81%92%e3%80%81%e5%88%87%e3%82%8a%e6%8d%a8%e3%81%a6","status":"publish","type":"post","link":"https:\/\/www.kd2.jp\/memo3\/?p=509","title":{"rendered":"C# \u56db\u6368\u4e94\u5165\u3001\u5207\u308a\u4e0a\u3052\u3001\u5207\u308a\u6368\u3066"},"content":{"rendered":"<div class=\"wp-block-codemirror-blocks code-block \">\n<pre class=\"CodeMirror\" data-setting=\"{&quot;mode&quot;:&quot;clike&quot;,&quot;mime&quot;:&quot;text\/x-csharp&quot;,&quot;theme&quot;:&quot;eclipse&quot;,&quot;lineNumbers&quot;:true,&quot;lineWrapping&quot;:false,&quot;styleActiveLine&quot;:false,&quot;readOnly&quot;:true,&quot;align&quot;:&quot;&quot;}\">using System;\r\n\r\nclass Test1\r\n{\r\n    static void Main()\r\n    {\r\n        Console.WriteLine(\"---start---\");\r\n        \/\/DoRoundTest1();\r\n        \/\/DoCeilingTest1();\r\n        \/\/DoTruncTest1();\r\n        DoFloorTest1();\r\n        Console.WriteLine(\"---end---\");\r\n    }\r\n\r\n    \/\/ \u56db\u6368\u4e94\u5165\u30c6\u30b9\u30c8\r\n    static void DoRoundTest1() {\r\n        double e = 2.7182;\r\n\r\n        \/\/ \u5c0f\u6570\u70b9\u7b2c1\u4f4d\u3092\u56db\u6368\u4e94\u5165\u3057\u3066\u3001\u6574\u6570\u5024\u3067\u8868\u793a\u3059\u308b\u3002-&gt; 3\r\n        Console.WriteLine(e.ToString(\"F0\"));\r\n\r\n        \/\/ \u5c0f\u6570\u70b9\u7b2c2\u4f4d\u3092\u56db\u6368\u4e94\u5165\u3057\u3066\u3001\u7b2c1\u307e\u3067\u8868\u793a\u3059\u308b\u3002-&gt; 2.7\r\n        Console.WriteLine(e.ToString(\"F1\"));\r\n\r\n        \/\/ \u5c0f\u6570\u70b9\u7b2c3\u4f4d\u3092\u56db\u6368\u4e94\u5165\u3057\u3066\u3001\u7b2c2\u4f4d\u307e\u3067\u8868\u793a\u3059\u308b\u3002-&gt; 2.72\r\n        Console.WriteLine(e.ToString(\"F2\"));\r\n\r\n        \/\/ \u5c0f\u6570\u70b9\u7b2c4\u4f4d\u3092\u56db\u6368\u4e94\u5165\u3057\u3066\u3001\u7b2c3\u4f4d\u307e\u3067\u8868\u793a\u3059\u308b\u3002-&gt; 2.718\r\n        Console.WriteLine(e.ToString(\"F3\"));\r\n\r\n        \/\/ \u5c0f\u6570\u70b9\u7b2c1\u4f4d\u3092\u56db\u6368\u4e94\u5165\u3057\u3066\u3001\u6574\u6570\u5024\u3067\u8868\u793a\u3059\u308b\u3002-&gt; 3\r\n        Console.WriteLine(Math.Round(e, MidpointRounding.AwayFromZero));\r\n\r\n        \/\/ \u5c0f\u6570\u70b9\u7b2c2\u4f4d\u3092\u56db\u6368\u4e94\u5165\u3057\u3066\u3001\u7b2c1\u307e\u3067\u8868\u793a\u3059\u308b\u3002-&gt; 2.7\r\n        Console.WriteLine(Math.Round(e, 1, MidpointRounding.AwayFromZero));\r\n\r\n        \/\/ \u5c0f\u6570\u70b9\u7b2c3\u4f4d\u3092\u56db\u6368\u4e94\u5165\u3057\u3066\u3001\u7b2c2\u307e\u3067\u8868\u793a\u3059\u308b\u3002-&gt; 2.72\r\n        Console.WriteLine(Math.Round(e, 2, MidpointRounding.AwayFromZero));\r\n\r\n        \/\/ \u5c0f\u6570\u70b9\u7b2c4\u4f4d\u3092\u56db\u6368\u4e94\u5165\u3057\u3066\u3001\u7b2c3\u307e\u3067\u8868\u793a\u3059\u308b\u3002-&gt; 2.718\r\n        Console.WriteLine(Math.Round(e, 3, MidpointRounding.AwayFromZero));\r\n    }\r\n\r\n    \/\/ \u5207\u4e0a\u3052\u30c6\u30b9\u30c8\r\n    static void DoCeilingTest1() {\r\n        double e = 2.7182;\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c1\u4f4d\u3092\u5207\u4e0a\u3052\u3057\u3066\u3001\u6574\u6570\u5024\u3067\u8868\u793a\u3059\u308b -&gt; 3\r\n        Console.WriteLine(Math.Ceiling(e));\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c2\u4f4d\u3092\u5207\u4e0a\u3052\u3057\u3066\u3001\u7b2c1\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.8\r\n        Console.WriteLine(Math.Ceiling((e * 10)) \/ 10);\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c3\u4f4d\u3092\u5207\u4e0a\u3052\u3057\u3066\u3001\u7b2c2\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.72\r\n        Console.WriteLine(Math.Ceiling((e * 100)) \/ 100);\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c4\u4f4d\u3092\u5207\u4e0a\u3052\u3057\u3066\u3001\u7b2c3\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.719\r\n        Console.WriteLine(Math.Ceiling((e * 1000)) \/ 1000);\r\n    }\r\n\r\n    \/\/ \u5207\u6368\u3066\u30c6\u30b9\u30c8\r\n    \/\/ \u8ca0\u6570\u306f0\u306b\u8fd1\u3065\u3051\u308b\r\n    static void DoTruncTest1() {\r\n        double e = 2.7182;\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c1\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u6574\u6570\u5024\u3067\u8868\u793a\u3059\u308b -&gt; 2\r\n        Console.WriteLine(Math.Truncate(e));\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c2\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c1\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.7\r\n        Console.WriteLine(Math.Truncate((e * 10)) \/ 10);\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c3\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c2\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.71\r\n        Console.WriteLine(Math.Truncate((e * 100)) \/ 100);\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c4\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c3\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.71\r\n        Console.WriteLine(Math.Truncate((e * 1000)) \/ 1000);\r\n\r\n        e *= -1;\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c2\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c1\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; -2.7\r\n        Console.WriteLine(Math.Truncate((e * 10)) \/ 10);\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c3\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c2\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; -2.71\r\n        Console.WriteLine(Math.Truncate((e * 100)) \/ 100);\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c4\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c3\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; -2.71\r\n        Console.WriteLine(Math.Truncate((e * 1000)) \/ 1000);\r\n    }\r\n\r\n    \/\/ \u5207\u6368\u3066\u30c6\u30b9\u30c8\r\n    \/\/ \u8ca0\u6570\u306f0\u304b\u3089\u9060\u3056\u3051\u308b\r\n    static void DoFloorTest1() {\r\n        double e = 2.7182;\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c1\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u6574\u6570\u5024\u3067\u8868\u793a\u3059\u308b -&gt; 2\r\n        Console.WriteLine(Math.Floor(e));\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c2\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c1\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.7\r\n        Console.WriteLine(Math.Floor((e * 10)) \/ 10);\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c3\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c2\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.71\r\n        Console.WriteLine(Math.Floor((e * 100)) \/ 100);\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c4\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c3\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.71\r\n        Console.WriteLine(Math.Floor((e * 1000)) \/ 1000);\r\n\r\n        e *= -1;\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c2\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c1\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.8\r\n        Console.WriteLine(Math.Floor((e * 10)) \/ 10);\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c3\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c2\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.72\r\n        Console.WriteLine(Math.Floor((e * 100)) \/ 100);\r\n\r\n        \/\/ \u5c11\u6570\u70b9\u7b2c4\u4f4d\u3092\u5207\u6368\u3066\u3057\u3066\u3001\u7b2c3\u307e\u3067\u8868\u793a\u3059\u308b\u3002 -&gt; 2.719\r\n        Console.WriteLine(Math.Floor((e * 1000)) \/ 1000);\r\n\r\n    }\r\n}<\/pre>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>using System; class Test1 { static void Main() { Console.WriteLine(&#8220;&#8212;start&#8212;&#8220;); \/\/DoRoundTest1(); \/\/DoCeili&hellip; <a class=\"more-link\" href=\"https:\/\/www.kd2.jp\/memo3\/?p=509\">\u7d9a\u304d\u3092\u8aad\u3080 <span class=\"screen-reader-text\">C# \u56db\u6368\u4e94\u5165\u3001\u5207\u308a\u4e0a\u3052\u3001\u5207\u308a\u6368\u3066<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21],"tags":[],"_links":{"self":[{"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/posts\/509"}],"collection":[{"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=509"}],"version-history":[{"count":3,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/posts\/509\/revisions"}],"predecessor-version":[{"id":512,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=\/wp\/v2\/posts\/509\/revisions\/512"}],"wp:attachment":[{"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=509"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=509"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kd2.jp\/memo3\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=509"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}