{"id":1944,"date":"2024-12-24T16:31:33","date_gmt":"2024-12-24T07:31:33","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1944"},"modified":"2025-03-24T08:49:32","modified_gmt":"2025-03-23T23:49:32","slug":"c-decimal%e3%81%ae%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a%e9%87%91%e8%9e%8d%e8%a8%88%e7%ae%97%e3%81%ab%e6%ac%a0%e3%81%8b%e3%81%9b%e3%81%aa%e3%81%8416%e3%81%ae%e9%87%8d%e8%a6%81","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1944","title":{"rendered":"C# decimal\u306e\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a\u91d1\u878d\u8a08\u7b97\u306b\u6b20\u304b\u305b\u306a\u304416\u306e\u91cd\u8981\u30dd\u30a4\u30f3\u30c8"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">\u306f\u3058\u3081\u306b<\/a>  <\/li>  <li>    <a href=\"#i-1\">decimal\u3068\u306f\uff1f\u91d1\u878d\u8a08\u7b97\u306e\u305f\u3081\u306e\u9ad8\u7cbe\u5ea6\u306a\u6570\u5024\u578b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first last\">        <a href=\"#i-2\">decimal\u578b\u304c\u751f\u307e\u308c\u305f\u80cc\u666f\u3068\u76ee\u7684<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">\u306a\u305cdecimal\u3092\u4f7f\u3046\u3079\u304d\u306a\u306e\u304b\uff1f\u30e1\u30ea\u30c3\u30c8\u3068\u6d3b\u7528\u30b7\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">\u91d1\u878d\u8a08\u7b97\u3067\u306e\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u554f\u984c\u70b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">decimal\u578b\u304c\u5a01\u529b\u3092\u767a\u63ee\u3059\u308b4\u3064\u306e\u5834\u9762<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-17\">decimal\u578b\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-18\">decimal\u578b\u306e\u5ba3\u8a00\u3068\u521d\u671f\u5316\u306e\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-22\">decimal\u30ea\u30c6\u30e9\u30eb\u3068\u30ad\u30e3\u30b9\u30c6\u30a3\u30f3\u30b0\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-25\">\u56db\u5247\u6f14\u7b97\u3068\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-29\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u3092\u610f\u8b58\u3057\u305fdecimal\u306e\u4f7f\u7528\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-30\">decimal\u578b\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u7406\u89e3\u3059\u308b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-32\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-39\">\u5b9f\u8df5\u7684\u306adecimal\u578b\u306e\u6d3b\u7528\u4f8b\u3068\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-40\">\u91d1\u878d\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u5b9f\u88c5\u4f8b\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-43\">\u5358\u4f53\u30c6\u30b9\u30c8\u3067decimal\u578b\u3092\u6271\u3046\u30b3\u30c4<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-46\">\u3088\u304f\u3042\u308bdecimal\u578b\u306e\u30c8\u30e9\u30d6\u30eb\u3068\u89e3\u6c7a\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-47\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b\u306e\u539f\u56e0\u3068\u5bfe\u7b56<\/a>      <\/li>      <li>        <a href=\"#i-50\">\u7cbe\u5ea6\u306b\u95a2\u3059\u308b\u6ce8\u610f\u70b9\u3068\u56de\u907f\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-53\">\u3088\u304f\u3042\u308b\u554f\u984c\u3068\u305d\u306e\u5bfe\u51e6\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-54\">\u30c7\u30d0\u30c3\u30b0\u306e\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-57\">decimal\u578b\u306e\u307e\u3068\u3081<\/a>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">\u306f\u3058\u3081\u306b<\/h2>\n\n\n\n<p>\u91d1\u878d\u30b7\u30b9\u30c6\u30e0\u306e\u958b\u767a\u306b\u304a\u3044\u3066\u3001\u6b63\u78ba\u306a\u6570\u5024\u8a08\u7b97\u306f\u7d76\u5bfe\u7684\u306a\u8981\u4ef6\u3067\u3059\u3002C#\u306edecimal\u578b\u306f\u3001\u3053\u306e\u8981\u4ef6\u3092\u6e80\u305f\u3059\u305f\u3081\u306b\u8a2d\u8a08\u3055\u308c\u305f\u7279\u5225\u306a\u6570\u5024\u578b\u3067\u3001\u91d1\u878d\u53d6\u5f15\u3084\u4f1a\u8a08\u51e6\u7406\u306b\u5fc5\u8981\u306a\u7cbe\u5ea6\u3068\u4fe1\u983c\u6027\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<br>\u672c\u8a18\u4e8b\u3067\u306f\u3001decimal\u578b\u306e\u57fa\u790e\u304b\u3089\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u65b9\u6cd5\u307e\u3067\u3001\u5b9f\u52d9\u3067\u5fc5\u8981\u306a\u77e5\u8b58\u3092\u4f53\u7cfb\u7684\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u672c\u8a18\u4e8b\u3067\u5b66\u3079\u308b\u3053\u3068<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<p class=\"is-style-sango-paragraph-idea-alt\">decimal\u578b\u306e\u6280\u8853\u7684\u7279\u5fb4\u3068\u5185\u90e8\u69cb\u9020<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u91d1\u878d\u8a08\u7b97\u306b\u304a\u3051\u308b\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u554f\u984c\u70b9\u3068decimal\u578b\u306e\u5229\u70b9<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u57fa\u672c\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5\u304b\u3089\u9ad8\u5ea6\u306a\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u307e\u3067<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u5b9f\u52d9\u3067\u4f7f\u3048\u308b\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u30d1\u30bf\u30fc\u30f3\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u5358\u4f53\u30c6\u30b9\u30c8\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af\u3068\u6ce8\u610f\u70b9<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u3088\u304f\u3042\u308b\u30c8\u30e9\u30d6\u30eb\u306e\u89e3\u6c7a\u65b9\u6cd5\u3068\u56de\u907f\u7b56<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-1\">decimal\u3068\u306f\uff1f\u91d1\u878d\u8a08\u7b97\u306e\u305f\u3081\u306e\u9ad8\u7cbe\u5ea6\u306a\u6570\u5024\u578b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">decimal\u578b\u304c\u751f\u307e\u308c\u305f\u80cc\u666f\u3068\u76ee\u7684<\/h3>\n\n\n\n<p>decimal\u578b\u306f\u3001Microsoft\u304c.NET Framework\u3092\u8a2d\u8a08\u3059\u308b\u969b\u306b\u3001\u91d1\u878d\u8a08\u7b97\u3084\u9ad8\u7cbe\u5ea6\u306a\u6570\u5024\u8a08\u7b97\u306e\u305f\u3081\u306b\u7279\u5225\u306b\u958b\u767a\u3057\u305f\u6570\u5024\u578b\u3067\u3059\u3002<br>\u5f93\u6765\u306efloat\u578b\u3084double\u578b\u3067\u306f\u3001\u91d1\u878d\u8a08\u7b97\u306b\u304a\u3044\u3066\u6df1\u523b\u306a\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u4f8b\u3048\u3070\u30010.1\u309210\u56de\u52a0\u7b97\u3059\u308b\u30681.0\u306b\u306a\u3089\u306a\u3044\u3068\u3044\u3063\u305f\u8a08\u7b97\u8aa4\u5dee\u304c\u751f\u3058\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306a\u80cc\u666f\u304b\u3089\u3001\u4ee5\u4e0b\u306e\u76ee\u7684\u3092\u9054\u6210\u3059\u308b\u305f\u3081\u306bdecimal\u578b\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-box sng-box box6\">\n<ol class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u6b63\u78ba\u306a\u5c0f\u6570\u8a08\u7b97\u306e\u5b9f\u73fe\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>10\u9032\u6570\u3067\u306e\u8a08\u7b97\u3092\u53ef\u80fd\u306b\u3057\u30012\u9032\u6570\u5909\u63db\u306b\u3088\u308b\u8aa4\u5dee\u3092\u6392\u9664<\/li>\n\n\n\n<li>\u91d1\u878d\u53d6\u5f15\u3067\u306e\u7aef\u6570\u51e6\u7406\u3092\u6b63\u78ba\u306b\u5b9f\u884c<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u6cd5\u4ee4\u9806\u5b88\u306e\u30b5\u30dd\u30fc\u30c8\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u4f1a\u8a08\u57fa\u6e96\u3067\u6c42\u3081\u3089\u308c\u308b\u8a08\u7b97\u7cbe\u5ea6\u306e\u78ba\u4fdd<\/li>\n\n\n\n<li>\u76e3\u67fb\u306b\u8010\u3048\u3046\u308b\u8a08\u7b97\u7d50\u679c\u306e\u63d0\u4f9b<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-3\">\u4e3b\u306a\u6280\u8853\u7684\u7279\u5fb4<\/h4>\n\n\n<div id=\"id-01837dc8-e61e-463f-bb7f-b25cb2f76600\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba<\/td><td>16\u30d0\u30a4\u30c8\uff08128\u30d3\u30c3\u30c8\uff09<\/td><\/tr><tr><td>\u7cbe\u5ea6<\/td><td>28-29\u6841\u306e\u6709\u52b9\u6570\u5b57<\/td><\/tr><tr><td>\u5c0f\u6570\u70b9\u4ee5\u4e0b<\/td><td>\u6700\u592728\u6841\u307e\u3067\u8868\u73fe\u53ef\u80fd<\/td><\/tr><tr><td>\u5024\u306e\u7bc4\u56f2<\/td><td>\u00b17.9\u00d710^28 \uff5e \u00b17.9\u00d710^-28<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\" id=\"i-4\">1. \u5185\u90e8\u8868\u73fe\u5f62\u5f0f<\/h4>\n\n\n\n<div class=\"wp-block-sgb-box sng-box box6\">\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>1\u30d3\u30c3\u30c8\uff1a\u7b26\u53f7\uff08\u6b63\u8ca0\uff09<\/li>\n\n\n\n<li>96\u30d3\u30c3\u30c8\uff1a\u4eee\u6570\u90e8<\/li>\n\n\n\n<li>8\u30d3\u30c3\u30c8\uff1a\u6307\u6570\u90e8\uff080\uff5e28\u306e\u7bc4\u56f2\uff09<\/li>\n\n\n\n<li>\u6b8b\u308a23\u30d3\u30c3\u30c8\uff1a\u4e88\u7d04\u9818\u57df<\/li>\n<\/ul>\n<\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-5\">2. \u6f14\u7b97\u51e6\u7406\u306e\u7279\u5fb4<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ 10\u9032\u6570\u3067\u306e\u6b63\u78ba\u306a\u8a08\u7b97\u304c\u53ef\u80fd\ndecimal value = 0.1M;\ndecimal sum = 0;\nfor (int i = 0; i &lt; 10; i++)\n{\n    sum += value;  \/\/ \u7d50\u679c\u306f\u6b63\u78ba\u306b1.0\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-6\">3. \u578b\u5909\u63db\u306e\u6319\u52d5<\/h4>\n\n\n\n<div class=\"wp-block-sgb-box sng-box box6\">\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u6697\u9ed9\u7684\u306a\u578b\u5909\u63db\u306f\u5236\u9650\u3055\u308c\u3066\u3044\u308b<\/li>\n\n\n\n<li>\u660e\u793a\u7684\u306a\u30ad\u30e3\u30b9\u30c8\u304c\u5fc5\u8981\u306a\u30b1\u30fc\u30b9\u304c\u591a\u3044<\/li>\n\n\n\n<li>\u7cbe\u5ea6\u304c\u5931\u308f\u308c\u308b\u5909\u63db\u306f\u8b66\u544a\u3055\u308c\u308b<\/li>\n<\/ul>\n<\/div>\n\n\n\n<p>decimal\u578b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e6\u30cb\u30fc\u30af\u306a\u6027\u8cea\u3082\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-box sng-box box6\">\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u56db\u5247\u6f14\u7b97\u306e\u7d50\u679c\u304c\u4e88\u6e2c\u53ef\u80fd<\/li>\n\n\n\n<li>\u4e38\u3081\u51e6\u7406\u306e\u65b9\u6cd5\u3092\u8a73\u7d30\u306b\u5236\u5fa1\u53ef\u80fd<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306ffloat\/double\u3088\u308a\u4f4e\u3044\u304c\u3001\u7cbe\u5ea6\u306f\u9ad8\u3044<\/li>\n<\/ul>\n<\/div>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306a\u7279\u5fb4\u306b\u3088\u308a\u3001decimal\u578b\u306f\u91d1\u878d\u8a08\u7b97\u3084\u4f1a\u8a08\u51e6\u7406\u306b\u304a\u3044\u3066\u5fc5\u8981\u4e0d\u53ef\u6b20\u306a\u578b\u3068\u3057\u3066\u5e83\u304f\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br>\u7279\u306b\u3001\u91d1\u984d\u8a08\u7b97\u3084\u5229\u7387\u8a08\u7b97\u306a\u3069\u3001\u6b63\u78ba\u306a\u5c0f\u6570\u8a08\u7b97\u304c\u6c42\u3081\u3089\u308c\u308b\u5834\u9762\u3067\u91cd\u5b9d\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">\u306a\u305cdecimal\u3092\u4f7f\u3046\u3079\u304d\u306a\u306e\u304b\uff1f\u30e1\u30ea\u30c3\u30c8\u3068\u6d3b\u7528\u30b7\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u91d1\u878d\u8a08\u7b97\u3067\u306e\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u554f\u984c\u70b9<\/h3>\n\n\n\n<p>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\uff08float\/double\uff09\u3092\u4f7f\u7528\u3057\u305f\u91d1\u878d\u8a08\u7b97\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u6df1\u523b\u306a\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-9\">1. \u4e38\u3081\u8aa4\u5dee\u306e\u84c4\u7a4d<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">double price = 0.1;\ndouble total = 0;\nfor (int i = 0; i &lt; 10; i++)\n{\n    total += price;\n}\nConsole.WriteLine(total); \/\/ 0.9999999999999999\u304c\u51fa\u529b\u3055\u308c\u308b<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-10\">2. \u6bd4\u8f03\u6f14\u7b97\u306e\u4fe1\u983c\u6027\u4f4e\u4e0b<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">double value1 = 0.1 + 0.2;\ndouble value2 = 0.3;\nConsole.WriteLine(value1 == value2); \/\/ false\u304c\u51fa\u529b\u3055\u308c\u308b<\/pre>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306a\u554f\u984c\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u91cd\u5927\u306a\u5f71\u97ff\u3092\u53ca\u307c\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u91cd\u5927\u306a\u5f71\u97ff\u3092\u53ca\u307c\u3059\u72b6\u6cc1<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<p class=\"is-style-sango-paragraph-exclamation-alt\">\u8ca1\u52d9\u8af8\u8868\u306e\u4f5c\u6210<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-exclamation-alt\">\u53d6\u5f15\u91d1\u984d\u306e\u8a08\u7b97<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-exclamation-alt\">\u5229\u606f\u8a08\u7b97<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-exclamation-alt\">\u7a0e\u91d1\u8a08\u7b97<\/p>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">decimal\u578b\u304c\u5a01\u529b\u3092\u767a\u63ee\u3059\u308b4\u3064\u306e\u5834\u9762<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-12\">1. \u91d1\u878d\u53d6\u5f15\u30b7\u30b9\u30c6\u30e0<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Transaction\n{\n    public decimal Amount { get; set; }\n    public decimal Fee { get; set; }\n\n    public decimal CalculateTotalAmount()\n    {\n        \/\/ \u6b63\u78ba\u306a\u8a08\u7b97\u304c\u53ef\u80fd\n        return Amount + Fee;\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-13\">2. \u4f1a\u8a08\u30b7\u30b9\u30c6\u30e0<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class AccountingEntry\n{\n    public decimal Debit { get; set; }\n    public decimal Credit { get; set; }\n\n    public bool IsBalanced()\n    {\n        \/\/ \u501f\u65b9\u3068\u8cb8\u65b9\u306e\u5b8c\u5168\u4e00\u81f4\u3092\u78ba\u8a8d\u53ef\u80fd\n        return Debit == Credit;\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-14\">3. \u7a0e\u7387\u8a08\u7b97<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class TaxCalculator\n{\n    private readonly decimal taxRate = 0.1M;\n\n    public decimal CalculateTax(decimal amount)\n    {\n        \/\/ \u6b63\u78ba\u306a\u7a0e\u984d\u8a08\u7b97\u304c\u53ef\u80fd\n        return amount * taxRate;\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-15\">4. \u5728\u5eab\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class InventoryItem\n{\n    public decimal UnitPrice { get; set; }\n    public decimal Quantity { get; set; }\n\n    public decimal CalculateInventoryValue()\n    {\n        \/\/ \u5728\u5eab\u91d1\u984d\u306e\u6b63\u78ba\u306a\u8a08\u7b97\u304c\u53ef\u80fd\n        return UnitPrice * Quantity;\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-16\">decimal\u578b\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u5f97\u3089\u308c\u308b\u4e3b\u306a\u30e1\u30ea\u30c3\u30c8<\/h4>\n\n\n<div id=\"id-c756f5fb-9853-4137-b31b-7c8405cf421c\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30e1\u30ea\u30c3\u30c8<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u8a08\u7b97\u7cbe\u5ea6<\/td><td>10\u9032\u6570\u3067\u306e\u6b63\u78ba\u306a\u8a08\u7b97\u304c\u53ef\u80fd<\/td><\/tr><tr><td>\u76e3\u67fb\u5bfe\u5fdc<\/td><td>\u8a08\u7b97\u904e\u7a0b\u306e\u8ffd\u8de1\u304c\u5bb9\u6613<\/td><\/tr><tr><td>\u6cd5\u4ee4\u9806\u5b88<\/td><td>\u4f1a\u8a08\u57fa\u6e96\u306b\u6e96\u62e0\u3057\u305f\u8a08\u7b97\u304c\u53ef\u80fd<\/td><\/tr><tr><td>\u30c7\u30d0\u30c3\u30b0\u6027<\/td><td>\u4e88\u6e2c\u53ef\u80fd\u306a\u8a08\u7b97\u7d50\u679c\u306b\u3088\u308b\u554f\u984c\u7279\u5b9a\u306e\u5bb9\u6613\u3055<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u7279\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u306f\u3001decimal\u578b\u306e\u4f7f\u7528\u304c\u5f37\u304f\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6cd5\u5b9a\u8981\u4ef6\u306e\u3042\u308b\u8a08\u7b97\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u7a0e\u91d1\u8a08\u7b97<\/li>\n\n\n\n<li>\u793e\u4f1a\u4fdd\u967a\u6599\u8a08\u7b97<\/li>\n\n\n\n<li>\u7d66\u4e0e\u8a08\u7b97<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u9ad8\u7cbe\u5ea6\u306a\u91d1\u878d\u8a08\u7b97\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u5229\u606f\u8a08\u7b97<\/li>\n\n\n\n<li>\u70ba\u66ff\u30ec\u30fc\u30c8\u8a08\u7b97<\/li>\n\n\n\n<li>\u6295\u8cc7\u53ce\u76ca\u7387\u8a08\u7b97<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30df\u30c3\u30b7\u30e7\u30f3\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u53d6\u5f15\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u9280\u884c\u53d6\u5f15<\/li>\n\n\n\n<li>\u8a3c\u5238\u53d6\u5f15<\/li>\n\n\n\n<li>\u6c7a\u6e08\u51e6\u7406<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-17\">decimal\u578b\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">decimal\u578b\u306e\u5ba3\u8a00\u3068\u521d\u671f\u5316\u306e\u65b9\u6cd5<\/h3>\n\n\n\n<p>decimal\u578b\u306e\u5909\u6570\u3092\u5ba3\u8a00\u30fb\u521d\u671f\u5316\u3059\u308b\u65b9\u6cd5\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30d1\u30bf\u30fc\u30f3\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-19\">1. \u30ea\u30c6\u30e9\u30eb\u3092\u4f7f\u7528\u3057\u305f\u521d\u671f\u5316<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ decimal\u578b\u30ea\u30c6\u30e9\u30eb\u306f\u30b5\u30d5\u30a3\u30c3\u30af\u30b9M\u307e\u305f\u306fm\u3092\u4f7f\u7528\ndecimal price = 1000.50M;\ndecimal rate = 0.08m;\n\n\/\/ \u6574\u6570\u304b\u3089\u306e\u521d\u671f\u5316\ndecimal amount = 5000M;<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-20\">2. \u578b\u5909\u63db\u3092\u4f7f\u7528\u3057\u305f\u521d\u671f\u5316<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u660e\u793a\u7684\u306a\u578b\u5909\u63db\ndouble doubleValue = 123.45;\ndecimal decimalValue = (decimal)doubleValue;\n\n\/\/ Parse\/TryParse\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\nstring strValue = \"2500.75\";\ndecimal parsedValue = decimal.Parse(strValue);\n\n\/\/ TryParse\u3092\u4f7f\u7528\u3057\u305f\u5b89\u5168\u306a\u5909\u63db\nif (decimal.TryParse(strValue, out decimal result))\n{\n    Console.WriteLine($\"\u5909\u63db\u6210\u529f: {result}\");\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-21\">3. decimal\u578b\u306e\u5b9a\u6570<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ decimal\u578b\u306e\u6700\u5927\u5024\u3068\u6700\u5c0f\u5024\ndecimal maxValue = decimal.MaxValue;  \/\/ 79,228,162,514,264,337,593,543,950,335\ndecimal minValue = decimal.MinValue;  \/\/ -79,228,162,514,264,337,593,543,950,335\n\n\/\/ \u3088\u304f\u4f7f\u7528\u3059\u308b\u5b9a\u6570\ndecimal zero = decimal.Zero;     \/\/ 0\ndecimal one = decimal.One;       \/\/ 1\ndecimal minusOne = decimal.MinusOne;  \/\/ -1<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">decimal\u30ea\u30c6\u30e9\u30eb\u3068\u30ad\u30e3\u30b9\u30c6\u30a3\u30f3\u30b0\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-23\">1. \u6697\u9ed9\u7684\u306a\u578b\u5909\u63db\uff08\u5b89\u5168\u306a\u5909\u63db\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u6574\u6570\u578b\u304b\u3089decimal\u3078\u306e\u5909\u63db\u306f\u5b89\u5168\nint intValue = 100;\ndecimal decimalFromInt = intValue;  \/\/ \u6697\u9ed9\u7684\u306a\u5909\u63db\u304c\u53ef\u80fd\n\n\/\/ \u3088\u308a\u5c0f\u3055\u3044\u7bc4\u56f2\u306e\u6570\u5024\u578b\u304b\u3089\u306e\u5909\u63db\nbyte byteValue = 255;\ndecimal decimalFromByte = byteValue;  \/\/ \u6697\u9ed9\u7684\u306a\u5909\u63db\u304c\u53ef\u80fd<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-24\">2. \u660e\u793a\u7684\u306a\u578b\u5909\u63db\uff08\u6ce8\u610f\u304c\u5fc5\u8981\u306a\u5909\u63db\uff09<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ decimal\u304b\u3089\u4ed6\u306e\u578b\u3078\u306e\u5909\u63db\uff08\u30c7\u30fc\u30bf\u640d\u5931\u306e\u53ef\u80fd\u6027\u3042\u308a\uff09\ndecimal largeDecimal = 1234.56M;\nint intFromDecimal = (int)largeDecimal;  \/\/ \u5c0f\u6570\u90e8\u5206\u304c\u5207\u308a\u6368\u3066\u3089\u308c\u308b\ndouble doubleFromDecimal = (double)largeDecimal;  \/\/ \u7cbe\u5ea6\u304c\u5931\u308f\u308c\u308b\u53ef\u80fd\u6027\u3042\u308a\n\n\/\/ \u5927\u304d\u306a\u5024\u306e\u5909\u63db\u6642\u306e\u6ce8\u610f\ndecimal veryLargeDecimal = decimal.MaxValue;\n\/\/ double doubleValue = (double)veryLargeDecimal;  \/\/ OverflowException\u304c\u767a\u751f<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-25\">\u56db\u5247\u6f14\u7b97\u3068\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-26\">1. \u57fa\u672c\u7684\u306a\u56db\u5247\u6f14\u7b97<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">decimal value1 = 120.50M;\ndecimal value2 = 50.25M;\n\n\/\/ \u52a0\u7b97\ndecimal sum = value1 + value2;  \/\/ 170.75\n\n\/\/ \u6e1b\u7b97\ndecimal difference = value1 - value2;  \/\/ 70.25\n\n\/\/ \u4e57\u7b97\ndecimal product = value1 * value2;  \/\/ 6055.125\n\n\/\/ \u9664\u7b97\uff08\u9ad8\u7cbe\u5ea6\u3067\u8a08\u7b97\u3055\u308c\u308b\uff09\ndecimal quotient = value1 \/ value2;  \/\/ 2.398009950248756218905472637<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-27\">2. \u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">decimal value = 123.456789M;\n\n\/\/ \u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u3092\u6307\u5b9a\u3057\u3066\u4e38\u3081\u308b\ndecimal rounded = decimal.Round(value, 2);  \/\/ 123.46\n\n\/\/ \u4e38\u3081\u30e2\u30fc\u30c9\u3092\u6307\u5b9a\ndecimal roundedUp = decimal.Round(value, 2, MidpointRounding.AwayFromZero);  \/\/ 123.46\ndecimal roundedDown = decimal.Round(value, 2, MidpointRounding.ToZero);  \/\/ 123.45\n\n\/\/ \u5207\u308a\u4e0a\u3052\/\u5207\u308a\u6368\u3066\ndecimal ceiling = decimal.Ceiling(value);  \/\/ 124\ndecimal floor = decimal.Floor(value);      \/\/ 123<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-28\">3. \u5b9f\u8df5\u7684\u306a\u8a08\u7b97\u4f8b<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class PriceCalculator\n{\n    private const decimal TaxRate = 0.10M;\n\n    public decimal CalculateTotalPrice(decimal basePrice, int quantity)\n    {\n        \/\/ \u5358\u4fa1 \u00d7 \u6570\u91cf\u306e\u8a08\u7b97\n        decimal subtotal = basePrice * quantity;\n\n        \/\/ \u7a0e\u984d\u306e\u8a08\u7b97\uff08\u5c0f\u6570\u70b9\u4ee5\u4e0b\u5207\u308a\u6368\u3066\uff09\n        decimal tax = decimal.Floor(subtotal * TaxRate);\n\n        \/\/ \u5408\u8a08\u91d1\u984d\u306e\u8a08\u7b97\n        return subtotal + tax;\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u57fa\u672c\u7684\u306a\u64cd\u4f5c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001decimal\u578b\u3092\u4f7f\u7528\u3057\u305f\u6b63\u78ba\u306a\u6570\u5024\u8a08\u7b97\u306e\u5b9f\u88c5\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<br>\u7279\u306b\u91d1\u878d\u8a08\u7b97\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u57fa\u672c\u64cd\u4f5c\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u3088\u308a\u8907\u96d1\u306a\u51e6\u7406\u3092\u5b9f\u88c5\u3057\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-29\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u3092\u610f\u8b58\u3057\u305fdecimal\u306e\u4f7f\u7528\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-30\">decimal\u578b\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u7406\u89e3\u3059\u308b<\/h3>\n\n\n\n<p>decimal\u578b\u306f16\u30d0\u30a4\u30c8\uff08128\u30d3\u30c3\u30c8\uff09\u306e\u30e1\u30e2\u30ea\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u4ed6\u306e\u6570\u5024\u578b\u3068\u6bd4\u8f03\u3057\u3066\u5927\u304d\u306a\u30b5\u30a4\u30ba\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div id=\"id-6eeb4e77-25d3-4691-9475-c0971de9dc9c\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6570\u5024\u578b<\/th><th>\u30e1\u30e2\u30ea\u30b5\u30a4\u30ba<\/th><th>\u7528\u9014<\/th><\/tr><\/thead><tbody><tr><td>int<\/td><td>4\u30d0\u30a4\u30c8<\/td><td>\u6574\u6570\u5024<\/td><\/tr><tr><td>float<\/td><td>4\u30d0\u30a4\u30c8<\/td><td>\u5358\u7cbe\u5ea6\u6d6e\u52d5\u5c0f\u6570\u70b9<\/td><\/tr><tr><td>double<\/td><td>8\u30d0\u30a4\u30c8<\/td><td>\u500d\u7cbe\u5ea6\u6d6e\u52d5\u5c0f\u6570\u70b9<\/td><\/tr><tr><td>decimal<\/td><td>16\u30d0\u30a4\u30c8<\/td><td>\u9ad8\u7cbe\u5ea6decimal<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\" id=\"i-31\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u5f71\u97ff\u4f8b<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class FinancialRecord\n{\n    \/\/ 1\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3042\u305f\u308a48\u30d0\u30a4\u30c8\u4f7f\u7528\n    public decimal Amount { get; set; }        \/\/ 16\u30d0\u30a4\u30c8\n    public decimal TaxAmount { get; set; }     \/\/ 16\u30d0\u30a4\u30c8\n    public decimal TotalAmount { get; set; }   \/\/ 16\u30d0\u30a4\u30c8\n}\n\n\/\/ 1\u4e07\u4ef6\u306e\u30ec\u30b3\u30fc\u30c9\u306e\u5834\u5408\n\/\/ 48\u30d0\u30a4\u30c8 \u00d7 10,000 = 480,000\u30d0\u30a4\u30c8\uff08\u7d04469KB\uff09<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-32\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-33\">1. \u4e0d\u8981\u306a\u578b\u5909\u63db\u3092\u907f\u3051\u308b<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class OptimizedCalculator\n{\n    \/\/ \u826f\u3044\u5b9f\u88c5\uff1a\u76f4\u63a5decimal\u3092\u4f7f\u7528\n    private const decimal TaxRate = 0.1M;\n\n    public decimal CalculateTax(decimal amount)\n    {\n        return amount * TaxRate;\n    }\n\n    \/\/ \u60aa\u3044\u5b9f\u88c5\uff1a\u4e0d\u8981\u306a\u578b\u5909\u63db\u304c\u767a\u751f\n    private const double BadTaxRate = 0.1;\n\n    public decimal CalculateTaxBad(decimal amount)\n    {\n        return amount * (decimal)BadTaxRate;\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-34\">2. \u30eb\u30fc\u30d7\u51e6\u7406\u306e\u6700\u9069\u5316<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class PerformanceOptimization\n{\n    \/\/ \u6700\u9069\u5316\u524d\uff1a\u30eb\u30fc\u30d7\u5185\u3067\u6bce\u56dedecimal\u6f14\u7b97\n    public decimal CalculateTotalBad(List&lt;decimal&gt; amounts)\n    {\n        decimal total = 0M;\n        foreach (var amount in amounts)\n        {\n            total = decimal.Round(total + amount, 2);\n        }\n        return total;\n    }\n\n    \/\/ \u6700\u9069\u5316\u5f8c\uff1a\u4e38\u3081\u51e6\u7406\u3092\u6700\u5f8c\u306b\u4e00\u56de\u3060\u3051\u5b9f\u884c\n    public decimal CalculateTotalGood(List&lt;decimal&gt; amounts)\n    {\n        decimal total = 0M;\n        foreach (var amount in amounts)\n        {\n            total += amount;\n        }\n        return decimal.Round(total, 2);\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-35\">3. \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MemoryOptimization\n{\n    \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u60aa\u3044\u5b9f\u88c5\n    public class IneffientStructure\n    {\n        public decimal Amount { get; set; }\n        public decimal Rate { get; set; }\n        public decimal Total { get; set; }\n        \/\/ 48\u30d0\u30a4\u30c8\u4f7f\u7528\n    }\n\n    \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u5b9f\u88c5\n    public class EfficientStructure\n    {\n        private decimal _amount;\n        public decimal Amount \n        { \n            get =&gt; _amount;\n            set\n            {\n                _amount = value;\n                Total = _amount * Rate;\n            }\n        }\n\n        public decimal Rate { get; set; }\n        public decimal Total { get; private set; }\n        \/\/ 32\u30d0\u30a4\u30c8\u4f7f\u7528\uff08\u8a08\u7b97\u5024\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\uff09\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-36\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-37\">1. \u4e26\u5217\u51e6\u7406\u306e\u4f7f\u7528<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public decimal CalculateParallel(List&lt;decimal&gt; amounts)\n{\n    return amounts.AsParallel()\n                 .Sum();\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-38\">2. \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6d3b\u7528<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CacheOptimization\n{\n    private readonly Dictionary&lt;decimal, decimal&gt; _taxCache = \n        new Dictionary&lt;decimal, decimal&gt;();\n\n    public decimal CalculateTaxWithCache(decimal amount)\n    {\n        if (_taxCache.TryGetValue(amount, out decimal cachedTax))\n        {\n            return cachedTax;\n        }\n\n        decimal tax = CalculateTax(amount);\n        _taxCache[amount] = tax;\n        return tax;\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001decimal\u578b\u3092\u4f7f\u7528\u3057\u306a\u304c\u3089\u3082\u9ad8\u3044\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<br>\u305f\u3060\u3057\u3001\u6700\u9069\u5316\u306f\u5fc5\u8981\u306a\u5834\u5408\u306b\u306e\u307f\u884c\u3044\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u3068\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u8003\u616e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-39\">\u5b9f\u8df5\u7684\u306adecimal\u578b\u306e\u6d3b\u7528\u4f8b\u3068\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-40\">\u91d1\u878d\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u5b9f\u88c5\u4f8b\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-41\">1. \u91d1\u984d\u3092\u6271\u3046Value Object\u30d1\u30bf\u30fc\u30f3<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Money\n{\n    private readonly decimal _amount;\n    private readonly string _currency;\n\n    public Money(decimal amount, string currency)\n    {\n        if (amount &lt; 0)\n            throw new ArgumentException(\"\u91d1\u984d\u306f0\u4ee5\u4e0a\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\", nameof(amount));\n\n        _amount = decimal.Round(amount, 2);\n        _currency = currency ?? throw new ArgumentNullException(nameof(currency));\n    }\n\n    public static Money Zero(string currency) =&gt; new Money(0, currency);\n\n    public Money Add(Money other)\n    {\n        if (_currency != other._currency)\n            throw new InvalidOperationException(\"\u901a\u8ca8\u5358\u4f4d\u304c\u7570\u306a\u308b\u91d1\u984d\u306f\u52a0\u7b97\u3067\u304d\u307e\u305b\u3093\");\n\n        return new Money(_amount + other._amount, _currency);\n    }\n\n    public Money Multiply(decimal factor)\n    {\n        return new Money(_amount * factor, _currency);\n    }\n\n    \/\/ Value Object\u306e\u7b49\u4fa1\u6027\u306e\u5b9f\u88c5\n    public override bool Equals(object obj)\n    {\n        if (obj is not Money other) return false;\n        return _amount == other._amount &amp;&amp; _currency == other._currency;\n    }\n\n    public override int GetHashCode()\n    {\n        return HashCode.Combine(_amount, _currency);\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-42\">2. \u5229\u606f\u8a08\u7b97\u306e\u30b5\u30fc\u30d3\u30b9\u30af\u30e9\u30b9<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class InterestCalculationService\n{\n    public decimal CalculateCompoundInterest(\n        decimal principal,\n        decimal annualRate,\n        int years,\n        int compoundingFrequency)\n    {\n        \/\/ \u5229\u7387\u3092\u5c0f\u6570\u306b\u5909\u63db\n        decimal rate = annualRate \/ 100M;\n\n        \/\/ \u8907\u5229\u8a08\u7b97\u306e\u5b9f\u88c5\n        decimal factor = 1M + (rate \/ compoundingFrequency);\n        decimal periods = years * compoundingFrequency;\n\n        decimal amount = principal * (decimal)Math.Pow((double)factor, (double)periods);\n        return decimal.Round(amount, 2);\n    }\n\n    public IEnumerable&lt;(DateTime Date, decimal Payment, decimal Principal, decimal Interest)&gt;\n        GenerateAmortizationSchedule(decimal loanAmount, decimal annualRate, int termInMonths)\n    {\n        decimal monthlyRate = annualRate \/ 12M \/ 100M;\n        decimal monthlyPayment = CalculateMonthlyPayment(loanAmount, monthlyRate, termInMonths);\n        decimal remainingBalance = loanAmount;\n        DateTime currentDate = DateTime.Now;\n\n        for (int month = 1; month &lt;= termInMonths; month++)\n        {\n            decimal interest = decimal.Round(remainingBalance * monthlyRate, 2);\n            decimal principal = decimal.Round(monthlyPayment - interest, 2);\n            remainingBalance -= principal;\n\n            yield return (currentDate.AddMonths(month), monthlyPayment, principal, interest);\n        }\n    }\n\n    private decimal CalculateMonthlyPayment(decimal loanAmount, decimal monthlyRate, int termInMonths)\n    {\n        decimal factor = (decimal)Math.Pow((double)(1M + monthlyRate), termInMonths);\n        return decimal.Round(loanAmount * monthlyRate * factor \/ (factor - 1M), 2);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-43\">\u5358\u4f53\u30c6\u30b9\u30c8\u3067decimal\u578b\u3092\u6271\u3046\u30b3\u30c4<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-44\">1. \u57fa\u672c\u7684\u306a\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MoneyTests\n{\n    [Fact]\n    public void \u540c\u4e00\u901a\u8ca8\u306e\u52a0\u7b97\u30c6\u30b9\u30c8()\n    {\n        \/\/ Arrange\n        var money1 = new Money(100.50M, \"JPY\");\n        var money2 = new Money(200.75M, \"JPY\");\n\n        \/\/ Act\n        var result = money1.Add(money2);\n\n        \/\/ Assert\n        Assert.Equal(301.25M, result.Amount);\n        Assert.Equal(\"JPY\", result.Currency);\n    }\n\n    [Fact]\n    public void \u7570\u306a\u308b\u901a\u8ca8\u306e\u52a0\u7b97\u3067\u4f8b\u5916\u767a\u751f()\n    {\n        \/\/ Arrange\n        var jpy = new Money(100.00M, \"JPY\");\n        var usd = new Money(100.00M, \"USD\");\n\n        \/\/ Act &amp; Assert\n        Assert.Throws&lt;InvalidOperationException&gt;(() =&gt; jpy.Add(usd));\n    }\n\n    [Theory]\n    [InlineData(100.00, 1.1, 110.00)]\n    [InlineData(50.25, 2.0, 100.50)]\n    [InlineData(33.33, 3.0, 99.99)]\n    public void \u4e57\u7b97\u30c6\u30b9\u30c8(decimal amount, decimal factor, decimal expected)\n    {\n        \/\/ Arrange\n        var money = new Money(amount, \"JPY\");\n\n        \/\/ Act\n        var result = money.Multiply(factor);\n\n        \/\/ Assert\n        Assert.Equal(expected, result.Amount);\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-45\">2. \u4e38\u3081\u51e6\u7406\u306e\u30c6\u30b9\u30c8<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class DecimalRoundingTests\n{\n    [Theory]\n    [InlineData(10.115, 2, 10.12)]\n    [InlineData(10.114, 2, 10.11)]\n    [InlineData(-10.115, 2, -10.12)]\n    public void \u6a19\u6e96\u7684\u306a\u4e38\u3081\u30c6\u30b9\u30c8(decimal input, int decimals, decimal expected)\n    {\n        \/\/ Act\n        var result = decimal.Round(input, decimals);\n\n        \/\/ Assert\n        Assert.Equal(expected, result);\n    }\n\n    [Theory]\n    [InlineData(10.5, MidpointRounding.AwayFromZero, 11)]\n    [InlineData(10.5, MidpointRounding.ToZero, 10)]\n    [InlineData(-10.5, MidpointRounding.AwayFromZero, -11)]\n    public void \u4e38\u3081\u30e2\u30fc\u30c9\u6307\u5b9a\u30c6\u30b9\u30c8(decimal input, MidpointRounding mode, decimal expected)\n    {\n        \/\/ Act\n        var result = decimal.Round(input, 0, mode);\n\n        \/\/ Assert\n        Assert.Equal(expected, result);\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3068\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306f\u3001\u5b9f\u969b\u306e\u696d\u52d9\u30b7\u30b9\u30c6\u30e0\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u5b9f\u88c5\u4f8b\u3067\u3059\u3002<br>\u7279\u306b\u91d1\u878d\u7cfb\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u57fa\u672c\u3068\u3057\u3066\u3001\u3088\u308a\u8907\u96d1\u306a\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3092\u5b9f\u88c5\u3057\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-46\">\u3088\u304f\u3042\u308bdecimal\u578b\u306e\u30c8\u30e9\u30d6\u30eb\u3068\u89e3\u6c7a\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-47\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b\u306e\u539f\u56e0\u3068\u5bfe\u7b56<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-48\">1. \u4e0d\u9069\u5207\u306a\u578b\u5909\u63db\u306b\u3088\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\npublic decimal CalculateTotal(List&lt;double&gt; prices)\n{\n    \/\/ \u6bce\u56de\u578b\u5909\u63db\u304c\u767a\u751f\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4f4e\u4e0b\n    return prices.Sum(price =&gt; (decimal)price);\n}\n\n\/\/ \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\npublic decimal CalculateTotal(List&lt;decimal&gt; prices)\n{\n    \/\/ \u578b\u5909\u63db\u304c\u4e0d\u8981\u3067\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u5411\u4e0a\n    return prices.Sum();\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-49\">2. \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u7684\u306a\u72b6\u6cc1<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\npublic class PriceHistory\n{\n    \/\/ \u5927\u91cf\u306edecimal\u5024\u3092\u4fdd\u6301\u3057\u7d9a\u3051\u308b\n    private readonly List&lt;decimal&gt; _priceHistory = new();\n\n    public void AddPrice(decimal price)\n    {\n        _priceHistory.Add(price);\n    }\n}\n\n\/\/ \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\npublic class PriceHistory\n{\n    \/\/ \u5fc5\u8981\u306a\u7d71\u8a08\u60c5\u5831\u306e\u307f\u3092\u4fdd\u6301\n    private decimal _sum = 0M;\n    private int _count = 0;\n\n    public void AddPrice(decimal price)\n    {\n        _sum += price;\n        _count++;\n    }\n\n    public decimal GetAverage() =&gt; _count &gt; 0 ? _sum \/ _count : 0M;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-50\">\u7cbe\u5ea6\u306b\u95a2\u3059\u308b\u6ce8\u610f\u70b9\u3068\u56de\u907f\u65b9\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-51\">1. \u4e38\u3081\u51e6\u7406\u306e\u554f\u984c<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\uff1a\u4e38\u3081\u8aa4\u5dee\u306e\u84c4\u7a4d\npublic decimal CalculateTotal(IEnumerable&lt;decimal&gt; amounts)\n{\n    decimal total = 0M;\n    foreach (var amount in amounts)\n    {\n        \/\/ \u6bce\u56de\u4e38\u3081\u3092\u884c\u3046\u3053\u3068\u3067\u8aa4\u5dee\u304c\u84c4\u7a4d\n        total = decimal.Round(total + amount, 2);\n    }\n    return total;\n}\n\n\/\/ \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\uff1a\u6700\u5f8c\u306b\u4e00\u5ea6\u3060\u3051\u4e38\u3081\u51e6\u7406\npublic decimal CalculateTotal(IEnumerable&lt;decimal&gt; amounts)\n{\n    decimal total = amounts.Sum();\n    return decimal.Round(total, 2);\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-52\">2. \u9664\u7b97\u3067\u306e\u8aa4\u5dee<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\uff1a\u9664\u7b97\u306e\u7d50\u679c\u304c\u4e88\u671f\u305b\u306c\u5024\u306b\u306a\u308b\npublic decimal CalculatePercentage(decimal part, decimal whole)\n{\n    \/\/ \u30b9\u30b1\u30fc\u30eb\u304c\u5927\u304d\u3059\u304e\u3066\u8aa4\u5dee\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\n    return (part \/ whole) * 100M;\n}\n\n\/\/ \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\uff1a\u30b9\u30b1\u30fc\u30eb\u3092\u9069\u5207\u306b\u8abf\u6574\npublic decimal CalculatePercentage(decimal part, decimal whole)\n{\n    if (whole == 0M) return 0M;\n\n    \/\/ \u5148\u306b100\u3092\u639b\u3051\u308b\u3053\u3068\u3067\u30b9\u30b1\u30fc\u30eb\u3092\u8abf\u6574\n    return decimal.Round((part * 100M) \/ whole, 2);\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-53\">\u3088\u304f\u3042\u308b\u554f\u984c\u3068\u305d\u306e\u5bfe\u51e6\u6cd5<\/h3>\n\n\n<div id=\"id-5dc71034-3a35-4cc4-aecd-e87c2feb3258\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u554f\u984c<\/th><th>\u539f\u56e0<\/th><th>\u5bfe\u7b56<\/th><\/tr><\/thead><tbody><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b<\/td><td>\u4e0d\u8981\u306a\u578b\u5909\u63db<\/td><td>decimal\u578b\u3067\u7d71\u4e00<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u5897\u5927<\/td><td>\u5927\u91cf\u306edecimal\u5024\u4fdd\u6301<\/td><td>\u5fc5\u8981\u306a\u5024\u306e\u307f\u4fdd\u6301<\/td><\/tr><tr><td>\u8a08\u7b97\u8aa4\u5dee<\/td><td>\u4e0d\u9069\u5207\u306a\u6f14\u7b97\u9806\u5e8f<\/td><td>\u6f14\u7b97\u9806\u5e8f\u306e\u6700\u9069\u5316<\/td><\/tr><tr><td>\u4e38\u3081\u8aa4\u5dee<\/td><td>\u4e2d\u9593\u8a08\u7b97\u3067\u306e\u4e38\u3081<\/td><td>\u6700\u5f8c\u306b\u307e\u3068\u3081\u3066\u4e38\u3081\u51e6\u7406<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-54\">\u30c7\u30d0\u30c3\u30b0\u306e\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-55\">1. \u30ed\u30b0\u51fa\u529b\u6642\u306e\u6ce8\u610f\u70b9<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class DecimalLogger\n{\n    public static string FormatForLog(decimal value)\n    {\n        \/\/ \u6307\u6570\u8868\u8a18\u3092\u907f\u3051\u3066\u5b8c\u5168\u306a\u5024\u3092\u51fa\u529b\n        return value.ToString(\"0.############################\");\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-56\">2. \u5358\u4f53\u30c6\u30b9\u30c8\u3067\u306e\u6bd4\u8f03<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class DecimalComparisonTests\n{\n    [Fact]\n    public void \u6bd4\u8f03\u30c6\u30b9\u30c8()\n    {\n        decimal expected = 100.25M;\n        decimal actual = 100.25M;\n\n        \/\/ \u76f4\u63a5\u7684\u306a\u7b49\u4fa1\u6027\u6bd4\u8f03\n        Assert.Equal(expected, actual);\n\n        \/\/ \u3088\u308a\u53b3\u5bc6\u306a\u6bd4\u8f03\u304c\u5fc5\u8981\u306a\u5834\u5408\n        Assert.True(Math.Abs(expected - actual) &lt; 0.0000001M);\n    }\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u554f\u984c\u306b\u906d\u9047\u3057\u305f\u5834\u5408\u306f\u3001\u307e\u305a\u554f\u984c\u306e\u539f\u56e0\u3092\u7279\u5b9a\u3057\u3001\u9069\u5207\u306a\u5bfe\u7b56\u3092\u8b1b\u3058\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<br>\u7279\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306b\u95a2\u3059\u308b\u554f\u984c\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u898f\u6a21\u304c\u5927\u304d\u304f\u306a\u308b\u307b\u3069\u5f71\u97ff\u304c\u9855\u8457\u306b\u306a\u308b\u305f\u3081\u3001\u65e9\u671f\u306e\u5bfe\u5fdc\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-57\">decimal\u578b\u306e\u307e\u3068\u3081<\/h2>\n\n\n\n<p>decimal\u578b\u306f\u3001\u91d1\u878d\u8a08\u7b97\u306b\u7279\u5316\u3057\u305f\u9ad8\u7cbe\u5ea6\u306a\u6570\u5024\u578b\u3068\u3057\u3066\u3001C#\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u5fc5\u9808\u306e\u30c4\u30fc\u30eb\u3067\u3059\u3002\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u6b63\u78ba\u306a\u8a08\u7b97\u7d50\u679c\u3092\u4fdd\u8a3c\u3057\u306a\u304c\u3089\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u672c\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u305f\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u91d1\u878d\u30b7\u30b9\u30c6\u30e0\u306e\u958b\u767a\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u3053\u306e\u8a18\u4e8b\u306e\u4e3b\u306a\u30dd\u30a4\u30f3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\">\n<li><strong>\u9078\u629e\u3068\u5224\u65ad<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u91d1\u878d\u8a08\u7b97\u3067\u306fdecimal\u578b\u3092\u7a4d\u6975\u7684\u306b\u6d3b\u7528<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u3092\u7406\u89e3\u3057\u305f\u5b9f\u88c5<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5b9f\u88c5\u306e\u30b3\u30c4<\/strong>\n<ul class=\"wp-block-list\">\n<li>Value Object\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u305f\u5805\u7262\u306a\u5b9f\u88c5<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u578b\u5909\u63db\u3092\u907f\u3051\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u4e38\u3081\u51e6\u7406\u306b\u3088\u308b\u8a08\u7b97\u7cbe\u5ea6\u306e\u78ba\u4fdd<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u54c1\u8cea\u62c5\u4fdd<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5358\u4f53\u30c6\u30b9\u30c8\u306b\u3088\u308b\u52d5\u4f5c\u4fdd\u8a3c<\/li>\n\n\n\n<li>\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u3092\u8003\u616e\u3057\u305f\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u7279\u6027\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u5224\u65ad<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5b9f\u52d9\u3067\u306e\u5fdc\u7528<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u91d1\u878d\u53d6\u5f15\u3067\u306e\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3<\/li>\n\n\n\n<li>\u4f1a\u8a08\u51e6\u7406\u3067\u306e\u5b9f\u88c5\u4f8b<\/li>\n\n\n\n<li>\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u5177\u4f53\u7684\u306a\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":2843,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,61],"tags":[],"class_list":{"0":"post-1944","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-csharp","8":"category-csharp-syntax"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1944","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1944"}],"version-history":[{"count":4,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1944\/revisions"}],"predecessor-version":[{"id":2844,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1944\/revisions\/2844"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/media\/2843"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1944"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1944"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}