{"id":2111,"date":"2025-03-24T08:48:16","date_gmt":"2025-03-23T23:48:16","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=2111"},"modified":"2025-03-24T08:48:42","modified_gmt":"2025-03-23T23:48:42","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91c%e3%81%ae%e6%95%b0%e5%80%a4%e4%b8%b8%e3%82%81%e5%87%a6%e7%90%86%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89-round%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=2111","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011C++\u306e\u6570\u5024\u4e38\u3081\u51e6\u7406\u5b8c\u5168\u30ac\u30a4\u30c9 &#8211; Round\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u304b\u3089\u30c6\u30af\u30cb\u30c3\u30af\u307e\u3067"},"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\">C++\u3067\u306e\u6570\u5024\u4e38\u3081\u51e6\u7406\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u6570\u5024\u4e38\u3081\u51e6\u7406\u304c\u5fc5\u8981\u3068\u306a\u308b\u30b1\u30fc\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">C++\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u63d0\u4f9b\u3059\u308b\u4e38\u3081\u95a2\u6570\u306e\u7a2e\u985e<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">std::round\u306e\u4f7f\u3044\u65b9\u3068\u5b9f\u88c5\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3068\u623b\u308a\u5024\u306e\u578b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-5\">\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u4f8b\u3067\u898b\u308bround\u95a2\u6570\u306e\u52d5\u4f5c<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-6\">\u3055\u307e\u3056\u307e\u306a\u4e38\u3081\u65b9\u5f0f\u3068\u305d\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-7\">\u5207\u308a\u4e0a\u3052\uff08ceil\uff09\u3068\u5207\u308a\u6368\u3066\uff08floor\uff09\u306e\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-8\">\u30d0\u30f3\u30ab\u30fc\u30ba\u4e38\u3081\u306e\u5b9f\u88c5\u3068\u305d\u306e\u7279\u5fb4<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-9\">\u4efb\u610f\u306e\u5c0f\u6570\u70b9\u4f4d\u7f6e\u3067\u306e\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-10\">\u4e38\u3081\u51e6\u7406\u306b\u304a\u3051\u308b\u6ce8\u610f\u70b9\u3068\u5bfe\u7b56<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-11\">\u6d6e\u52d5\u5c0f\u6570\u70b9\u306e\u7cbe\u5ea6\u9650\u754c\u3068\u5bfe\u51e6\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-12\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u306e\u52d5\u4f5c\u306e\u9055\u3044<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-14\">\u5b9f\u8df5\u7684\u306a\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-15\">\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u4f7f\u7528\u3057\u305f\u6c4e\u7528\u7684\u306a\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-16\">SIMD\u30b3\u30de\u30f3\u30c9\u3092\u6d3b\u7528\u3057\u305f\u9ad8\u901f\u306a\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u73fe<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-17\">\u5358\u4f53\u30c6\u30b9\u30c8\u3067\u78ba\u8a8d\u3059\u3079\u304d\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9<\/a>      <\/li>    <\/ul>  <\/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\">C++\u3067\u306e\u6570\u5024\u4e38\u3081\u51e6\u7406\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u6570\u5024\u4e38\u3081\u51e6\u7406\u304c\u5fc5\u8981\u3068\u306a\u308b\u30b1\u30fc\u30b9<\/h3>\n\n\n\n<p>\u6570\u5024\u306e\u4e38\u3081\u51e6\u7406\u306f\u3001\u5b9f\u52d9\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u983b\u7e41\u306b\u5fc5\u8981\u3068\u306a\u308b\u64cd\u4f5c\u3067\u3059\u3002\u4e3b\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u5229\u7528\u3055\u308c\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u91d1\u984d\u8a08\u7b97\u3067\u306e\u5229\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7a0e\u984d\u8a08\u7b97\u6642\u306e\u7aef\u6570\u51e6\u7406<\/li>\n\n\n\n<li>\u5272\u5f15\u8a08\u7b97\u5f8c\u306e\u4fa1\u683c\u8abf\u6574<\/li>\n\n\n\n<li>\u70ba\u66ff\u30ec\u30fc\u30c8\u63db\u7b97\u5f8c\u306e\u91d1\u984d\u8abf\u6574<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u79d1\u5b66\u6280\u8853\u8a08\u7b97\u3067\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6e2c\u5b9a\u5024\u306e\u6709\u52b9\u6841\u6570\u306e\u8abf\u6574<\/li>\n\n\n\n<li>\u8a08\u7b97\u7d50\u679c\u306e\u7cbe\u5ea6\u7ba1\u7406<\/li>\n\n\n\n<li>\u7d71\u8a08\u51e6\u7406\u3067\u306e\u30c7\u30fc\u30bf\u6b63\u898f\u5316<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u306e\u8868\u793a<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b0\u30e9\u30d5\u8868\u793a\u6642\u306e\u8ef8\u76ee\u76db\u308a\u306e\u8abf\u6574<\/li>\n\n\n\n<li>\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u8868\u793a\u6642\u306e\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u5236\u5fa1<\/li>\n\n\n\n<li>\u30d7\u30ed\u30b0\u30ec\u30b9\u30d0\u30fc\u306e\u9032\u6357\u7387\u8a08\u7b97<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30ea\u30bd\u30fc\u30b9\u5272\u308a\u5f53\u3066\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u914d\u5206\u6642\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u8abf\u6574<\/li>\n\n\n\n<li>\u30bf\u30a4\u30e0\u30b9\u30e9\u30a4\u30b9\u5236\u5fa1\u3067\u306e\u6642\u9593\u5207\u308a\u4e0a\u3052<\/li>\n\n\n\n<li>\u30c7\u30a3\u30b9\u30af\u5bb9\u91cf\u8a08\u7b97\u6642\u306e\u5883\u754c\u5024\u8abf\u6574<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">C++\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u63d0\u4f9b\u3059\u308b\u4e38\u3081\u95a2\u6570\u306e\u7a2e\u985e<\/h3>\n\n\n\n<p>C++\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\uff08<code>&lt;cmath&gt;<\/code>\uff09\u306b\u306f\u3001\u69d8\u3005\u306a\u4e38\u3081\u51e6\u7406\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306e\u95a2\u6570\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u57fa\u672c\u7684\u306a\u4e38\u3081\u95a2\u6570<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   #include &lt;cmath&gt;\n\n   double value = 3.7;\n   double rounded = std::round(value);    \/\/ \u56db\u6368\u4e94\u5165\uff083.7 \u2192 4.0\uff09\n   double floored = std::floor(value);    \/\/ \u5207\u308a\u6368\u3066\uff083.7 \u2192 3.0\uff09\n   double ceiled = std::ceil(value);      \/\/ \u5207\u308a\u4e0a\u3052\uff083.7 \u2192 4.0\uff09\n   double trunced = std::trunc(value);    \/\/ \u96f6\u65b9\u5411\u3078\u306e\u4e38\u3081\uff083.7 \u2192 3.0\uff09<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u5270\u4f59\u3092\u6c42\u3081\u308b\u95a2\u6570<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   double fmod_result = std::fmod(5.7, 2.0);    \/\/ \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u5270\u4f59\uff085.7 % 2.0 \u2192 1.7\uff09\n   double remainder = std::remainder(5.7, 2.0);  \/\/ IEEE 754\u6e96\u62e0\u306e\u5270\u4f59\u8a08\u7b97<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u8fd1\u63a5\u6574\u6570\u3078\u306e\u4e38\u3081\u95a2\u6570<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   double value = -3.7;\n   double nearest = std::nearbyint(value);  \/\/ \u6700\u8fd1\u63a5\u6574\u6570\u3078\u306e\u4e38\u3081\uff08\u30d0\u30f3\u30ab\u30fc\u30ba\u4e38\u3081\u3001FE_TONEAREST\u4f7f\u7528\uff09\n   long rounded_long = std::lround(value);  \/\/ long\u578b\u3078\u306e\u4e38\u3081\uff08-3.7 \u2192 -4\uff09\n   long long rounded_ll = std::llround(value);  \/\/ long long\u578b\u3078\u306e\u4e38\u3081<\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>\u578b\u5909\u63db\u3092\u4f34\u3046\u4e38\u3081\u95a2\u6570<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   float value = 3.7f;\n   int rounded_int = std::rint(value);      \/\/ \u73fe\u5728\u306e\u4e38\u3081\u30e2\u30fc\u30c9\u306b\u5f93\u3063\u3066\u6574\u6570\u5024\u3078\n   double rounded_dbl = std::rint(value);   \/\/ double\u578b\u3068\u3057\u3066\u7d50\u679c\u3092\u8fd4\u3059<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u95a2\u6570\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u3092\u6301\u3063\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n<div id=\"id-e23207d6-b98f-46a1-90cf-57e046db32ed\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u95a2\u6570\u540d<\/th><th>\u4e3b\u306a\u7528\u9014<\/th><th>\u623b\u308a\u5024\u306e\u578b<\/th><th>\u7279\u5fb4<\/th><\/tr><\/thead><tbody><tr><td>round<\/td><td>\u4e00\u822c\u7684\u306a\u56db\u6368\u4e94\u5165<\/td><td>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570<\/td><td>\u6700\u3082\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u308b<\/td><\/tr><tr><td>floor<\/td><td>\u5207\u308a\u6368\u3066\u51e6\u7406<\/td><td>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570<\/td><td>\u5e38\u306b\u5c0f\u3055\u3044\u65b9\u306e\u6574\u6570<\/td><\/tr><tr><td>ceil<\/td><td>\u5207\u308a\u4e0a\u3052\u51e6\u7406<\/td><td>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570<\/td><td>\u5e38\u306b\u5927\u304d\u3044\u65b9\u306e\u6574\u6570<\/td><\/tr><tr><td>trunc<\/td><td>\u5c0f\u6570\u90e8\u306e\u5207\u308a\u6368\u3066<\/td><td>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570<\/td><td>0\u65b9\u5411\u3078\u306e\u4e38\u3081<\/td><\/tr><tr><td>nearbyint<\/td><td>\u6700\u8fd1\u63a5\u6574\u6570\u3078\u306e\u4e38\u3081<\/td><td>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570<\/td><td>\u73fe\u5728\u306e\u4e38\u3081\u30e2\u30fc\u30c9\u3092\u4f7f\u7528<\/td><\/tr><tr><td>lround\/llround<\/td><td>\u6574\u6570\u578b\u3078\u306e\u5909\u63db\u3092\u4f34\u3046\u4e38\u3081<\/td><td>long\/long long<\/td><td>\u6574\u6570\u578b\u304c\u5fc5\u8981\u306a\u5834\u5408\u306b\u4f7f\u7528<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u5404\u95a2\u6570\u306f\u7279\u5b9a\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306b\u6700\u9069\u5316\u3055\u308c\u3066\u304a\u308a\u3001\u9069\u5207\u306a\u95a2\u6570\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u6b63\u78ba\u306a\u4e38\u3081\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u6700\u3082\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u308b<code>std::round<\/code>\u95a2\u6570\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">std::round\u306e\u4f7f\u3044\u65b9\u3068\u5b9f\u88c5\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3068\u623b\u308a\u5024\u306e\u578b<\/h3>\n\n\n\n<p><code>std::round<\/code>\u95a2\u6570\u306f\u3001C++11\u4ee5\u964d\u3067\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306e<code>&lt;cmath&gt;<\/code>\u30d8\u30c3\u30c0\u306b\u542b\u307e\u308c\u308b\u6570\u5024\u4e38\u3081\u95a2\u6570\u3067\u3059\u3002\u6700\u3082\u8fd1\u3044\u6574\u6570\u5024\u3078\u306e\u4e38\u3081\u3092\u884c\u3046\u969b\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u57fa\u672c\u7684\u306a\u95a2\u6570\u30b7\u30b0\u30cd\u30c1\u30e3\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">float round(float arg);\ndouble round(double arg);\nlong double round(long double arg);\nfloat roundf(float arg);  \/\/ C\u8a00\u8a9e\u3068\u306e\u4e92\u63db\u6027\u306e\u305f\u3081\u306e\u5225\u540d\ndouble roundl(long double arg);  \/\/ C\u8a00\u8a9e\u3068\u306e\u4e92\u63db\u6027\u306e\u305f\u3081\u306e\u5225\u540d<\/pre>\n\n\n\n<p><strong>\u623b\u308a\u5024\u306e\u7279\u5fb4\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f15\u6570\u3068\u540c\u3058\u578b\u306e\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3092\u8fd4\u3057\u307e\u3059<\/li>\n\n\n\n<li>\u5c0f\u6570\u90e8\u304c0.5\u672a\u6e80\u306e\u5834\u5408\u306f\u5207\u308a\u6368\u3066<\/li>\n\n\n\n<li>\u5c0f\u6570\u90e8\u304c0.5\u4ee5\u4e0a\u306e\u5834\u5408\u306f\u5207\u308a\u4e0a\u3052<\/li>\n\n\n\n<li>\u623b\u308a\u5024\u306f\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u578b\u3067\u3059\u304c\u3001\u6574\u6570\u5024\u3092\u8868\u73fe\u3057\u307e\u3059<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u4f8b\u3067\u898b\u308bround\u95a2\u6570\u306e\u52d5\u4f5c<\/h3>\n\n\n\n<p>\u4ee5\u4e0b\u306b\u3001<code>std::round<\/code>\u95a2\u6570\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u57fa\u672c\u7684\u306a\u4e38\u3081\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n\nint main() {\n    \/\/ \u57fa\u672c\u7684\u306a\u4e38\u3081\u51e6\u7406\u306e\u4f8b\n    double values[] = {3.3, 3.5, 3.7, -3.3, -3.5, -3.7};\n\n    std::cout &lt;&lt; \"\u57fa\u672c\u7684\u306a\u4e38\u3081\u51e6\u7406\u306e\u30c7\u30e2\uff1a\\n\";\n    for (double val : values) {\n        std::cout &lt;&lt; \"round(\" &lt;&lt; val &lt;&lt; \") = \" &lt;&lt; std::round(val) &lt;&lt; \"\\n\";\n    }\n    return 0;\n}<\/pre>\n\n\n\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\u57fa\u672c\u7684\u306a\u4e38\u3081\u51e6\u7406\u306e\u30c7\u30e2\uff1a\nround(3.3) = 3\nround(3.5) = 4\nround(3.7) = 4\nround(-3.3) = -3\nround(-3.5) = -4\nround(-3.7) = -4<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\uff1a\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u8a08\u7b97<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;iomanip&gt;\n\ndouble calculate_percentage(int value, int total, int decimal_places = 1) {\n    \/\/ \u6307\u5b9a\u3055\u308c\u305f\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u3067\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u3092\u8a08\u7b97\n    double multiplier = std::pow(10.0, decimal_places);\n    double percentage = (static_cast&lt;double&gt;(value) \/ total) * 100.0;\n\n    \/\/ round\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u6307\u5b9a\u6841\u6570\u3067\u4e38\u3081\u308b\n    return std::round(percentage * multiplier) \/ multiplier;\n}\n\nint main() {\n    int successes = 42;\n    int total_trials = 97;\n\n    std::cout &lt;&lt; std::fixed &lt;&lt; std::setprecision(1);\n    std::cout &lt;&lt; \"\u6210\u529f\u7387: \" \n              &lt;&lt; calculate_percentage(successes, total_trials) \n              &lt;&lt; \"%\\n\";\n    return 0;\n}<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u91d1\u984d\u8a08\u7b97\u3067\u306e\u5229\u7528\u4f8b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n\nclass PriceCalculator {\npublic:\n    \/\/ \u7a0e\u8fbc\u4fa1\u683c\u306e\u8a08\u7b97\uff081\u5186\u5358\u4f4d\u3067\u4e38\u3081\u308b\uff09\n    static int calculate_tax_included_price(double price, double tax_rate = 0.10) {\n        return static_cast&lt;int&gt;(std::round(price * (1 + tax_rate)));\n    }\n\n    \/\/ \u5272\u5f15\u5f8c\u4fa1\u683c\u306e\u8a08\u7b97\uff0810\u5186\u5358\u4f4d\u3067\u4e38\u3081\u308b\uff09\n    static int calculate_discounted_price(double price, double discount_rate) {\n        double discounted = price * (1 - discount_rate);\n        return static_cast&lt;int&gt;(std::round(discounted \/ 10.0) * 10);\n    }\n};\n\nint main() {\n    double original_price = 1234.56;\n\n    \/\/ \u7a0e\u8fbc\u4fa1\u683c\u306e\u8a08\u7b97\uff081\u5186\u5358\u4f4d\uff09\n    int tax_included = PriceCalculator::calculate_tax_included_price(original_price);\n\n    \/\/ 20%\u5272\u5f15\u4fa1\u683c\u306e\u8a08\u7b97\uff0810\u5186\u5358\u4f4d\uff09\n    int discounted = PriceCalculator::calculate_discounted_price(original_price, 0.20);\n\n    std::cout &lt;&lt; \"\u5143\u306e\u4fa1\u683c: \" &lt;&lt; original_price &lt;&lt; \"\u5186\\n\"\n              &lt;&lt; \"\u7a0e\u8fbc\u4fa1\u683c: \" &lt;&lt; tax_included &lt;&lt; \"\u5186\\n\"\n              &lt;&lt; \"\u5272\u5f15\u4fa1\u683c: \" &lt;&lt; discounted &lt;&lt; \"\u5186\\n\";\n    return 0;\n}<\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u306e\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;limits&gt;\n\nvoid demonstrate_edge_cases() {\n    \/\/ \u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u306e\u51e6\u7406\n    std::cout &lt;&lt; \"\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u306e\u51e6\u7406:\\n\";\n\n    \/\/ \u975e\u5e38\u306b\u5927\u304d\u306a\u6570\u5024\u306e\u4e38\u3081\n    double large_num = std::numeric_limits&lt;double&gt;::max() \/ 2;\n    std::cout &lt;&lt; \"\u5927\u304d\u306a\u6570\u5024: \" &lt;&lt; std::round(large_num) &lt;&lt; \"\\n\";\n\n    \/\/ \u975e\u5e38\u306b\u5c0f\u3055\u306a\u6570\u5024\u306e\u4e38\u3081\n    double tiny_num = std::numeric_limits&lt;double&gt;::min();\n    std::cout &lt;&lt; \"\u5c0f\u3055\u306a\u6570\u5024: \" &lt;&lt; std::round(tiny_num) &lt;&lt; \"\\n\";\n\n    \/\/ \u00b10\u306e\u51e6\u7406\n    std::cout &lt;&lt; \"\u6b63\u306e\u30bc\u30ed: \" &lt;&lt; std::round(0.0) &lt;&lt; \"\\n\";\n    std::cout &lt;&lt; \"\u8ca0\u306e\u30bc\u30ed: \" &lt;&lt; std::round(-0.0) &lt;&lt; \"\\n\";\n\n    \/\/ NaN\u3068Infinity\u306e\u51e6\u7406\n    std::cout &lt;&lt; \"NaN: \" &lt;&lt; std::round(std::numeric_limits&lt;double&gt;::quiet_NaN()) &lt;&lt; \"\\n\";\n    std::cout &lt;&lt; \"Infinity: \" &lt;&lt; std::round(std::numeric_limits&lt;double&gt;::infinity()) &lt;&lt; \"\\n\";\n}<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u4f8b\u306f\u3001<code>std::round<\/code>\u95a2\u6570\u306e\u5b9f\u969b\u306e\u4f7f\u7528\u30b7\u30fc\u30f3\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u6ce8\u610f\u70b9\u3068\u3057\u3066\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7cbe\u5ea6\u304c\u91cd\u8981\u306a\u8a08\u7b97\u3067\u306f\u3001\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u7279\u6027\u3092\u7406\u89e3\u3057\u305f\u4e0a\u3067\u4f7f\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u91d1\u984d\u8a08\u7b97\u3067\u306f\u3001\u4e38\u3081\u8aa4\u5dee\u306e\u84c4\u7a4d\u3092\u9632\u3050\u305f\u3081\u3001\u9069\u5207\u306a\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u4e38\u3081\u51e6\u7406\u3092\u884c\u3046<\/li>\n\n\n\n<li>\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u306e\u51e6\u7406\u3092\u8003\u616e\u3057\u305f\u30ed\u30d0\u30b9\u30c8\u306a\u5b9f\u88c5\u3092\u5fc3\u304c\u3051\u308b<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u91cd\u8981\u306a\u5834\u5408\u306f\u3001\u4e38\u3081\u51e6\u7406\u306e\u56de\u6570\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u4e38\u3081\u65b9\u5f0f\u3068\u305d\u306e\u5b9f\u88c5\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-6\">\u3055\u307e\u3056\u307e\u306a\u4e38\u3081\u65b9\u5f0f\u3068\u305d\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u5207\u308a\u4e0a\u3052\uff08ceil\uff09\u3068\u5207\u308a\u6368\u3066\uff08floor\uff09\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p><code>std::ceil<\/code>\u3068<code>std::floor<\/code>\u306f\u3001\u305d\u308c\u305e\u308c\u6570\u5024\u3092\u5207\u308a\u4e0a\u3052\u30fb\u5207\u308a\u6368\u3066\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u57fa\u672c\u7684\u306a\u95a2\u6570\u3067\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;iomanip&gt;\n\nvoid demonstrate_basic_rounding() {\n    double values[] = {3.1, 3.5, 3.7, -3.1, -3.5, -3.7};\n\n    std::cout &lt;&lt; std::fixed &lt;&lt; std::setprecision(1);\n    for (double val : values) {\n        std::cout &lt;&lt; \"\u5024: \" &lt;&lt; val \n                  &lt;&lt; \" \u2192 ceil: \" &lt;&lt; std::ceil(val)\n                  &lt;&lt; \" | floor: \" &lt;&lt; std::floor(val) &lt;&lt; \"\\n\";\n    }\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30ab\u30b9\u30bf\u30e0\u5207\u308a\u4e0a\u3052\u30fb\u5207\u308a\u6368\u3066\u95a2\u6570\u306e\u5b9f\u88c5<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class CustomRounder {\npublic:\n    \/\/ \u6307\u5b9a\u3055\u308c\u305f\u500d\u6570\u3078\u306e\u5207\u308a\u4e0a\u3052\n    static double ceil_to_multiple(double value, double multiple) {\n        return std::ceil(value \/ multiple) * multiple;\n    }\n\n    \/\/ \u6307\u5b9a\u3055\u308c\u305f\u500d\u6570\u3078\u306e\u5207\u308a\u6368\u3066\n    static double floor_to_multiple(double value, double multiple) {\n        return std::floor(value \/ multiple) * multiple;\n    }\n\n    \/\/ \u6307\u5b9a\u6841\u6570\u3067\u306e\u5207\u308a\u4e0a\u3052\n    static double ceil_to_precision(double value, int decimals) {\n        double factor = std::pow(10.0, decimals);\n        return std::ceil(value * factor) \/ factor;\n    }\n\n    \/\/ \u6307\u5b9a\u6841\u6570\u3067\u306e\u5207\u308a\u6368\u3066\n    static double floor_to_precision(double value, int decimals) {\n        double factor = std::pow(10.0, decimals);\n        return std::floor(value * factor) \/ factor;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u30d0\u30f3\u30ab\u30fc\u30ba\u4e38\u3081\u306e\u5b9f\u88c5\u3068\u305d\u306e\u7279\u5fb4<\/h3>\n\n\n\n<p>\u30d0\u30f3\u30ab\u30fc\u30ba\u4e38\u3081\uff08\u5076\u6570\u4e38\u3081\uff09\u306f\u3001\u7d71\u8a08\u51e6\u7406\u3084\u91d1\u878d\u8a08\u7b97\u3067\u4f7f\u7528\u3055\u308c\u308b\u7279\u6b8a\u306a\u4e38\u3081\u65b9\u5f0f\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n\nclass BankersRounding {\npublic:\n    \/\/ \u30d0\u30f3\u30ab\u30fc\u30ba\u4e38\u3081\u306e\u5b9f\u88c5\n    static double round(double value, int decimals = 0) {\n        double factor = std::pow(10.0, decimals);\n        double scaled = value * factor;\n        double fraction = scaled - std::floor(scaled);\n\n        if (fraction == 0.5) {\n            \/\/ \u6700\u8fd1\u63a5\u5076\u6570\u3078\u306e\u4e38\u3081\n            double floor_val = std::floor(scaled);\n            return (static_cast&lt;int&gt;(floor_val) % 2 == 0 ? floor_val : std::ceil(scaled)) \/ factor;\n        } else {\n            \/\/ \u901a\u5e38\u306e\u56db\u6368\u4e94\u5165\n            return std::round(scaled) \/ factor;\n        }\n    }\n\n    \/\/ \u4f7f\u7528\u4f8b\u3092\u793a\u3059\u30c7\u30e2\u95a2\u6570\n    static void demonstrate() {\n        double test_values[] = {2.5, 3.5, 4.5, -2.5, -3.5, -4.5};\n\n        std::cout &lt;&lt; \"\u30d0\u30f3\u30ab\u30fc\u30ba\u4e38\u3081\u306e\u30c7\u30e2:\\n\";\n        for (double val : test_values) {\n            std::cout &lt;&lt; val &lt;&lt; \" \u2192 \" &lt;&lt; round(val) &lt;&lt; \"\\n\";\n        }\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u4efb\u610f\u306e\u5c0f\u6570\u70b9\u4f4d\u7f6e\u3067\u306e\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p>\u3088\u308a\u8907\u96d1\u306a\u4e38\u3081\u51e6\u7406\u306e\u30cb\u30fc\u30ba\u306b\u5bfe\u5fdc\u3059\u308b\u305f\u3081\u306e\u30ab\u30b9\u30bf\u30e0\u5b9f\u88c5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6c4e\u7528\u7684\u306a\u4e38\u3081\u51e6\u7406\u30af\u30e9\u30b9<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;stdexcept&gt;\n\nclass PrecisionRounder {\npublic:\n    enum class RoundingMode {\n        Round,      \/\/ \u56db\u6368\u4e94\u5165\n        Ceil,       \/\/ \u5207\u308a\u4e0a\u3052\n        Floor,      \/\/ \u5207\u308a\u6368\u3066\n        Bankers     \/\/ \u30d0\u30f3\u30ab\u30fc\u30ba\u4e38\u3081\n    };\n\n    \/\/ \u6307\u5b9a\u3055\u308c\u305f\u7cbe\u5ea6\u3068\u65b9\u5f0f\u3067\u4e38\u3081\u51e6\u7406\u3092\u884c\u3046\n    static double round(double value, int decimals, RoundingMode mode = RoundingMode::Round) {\n        if (decimals &lt; 0) {\n            throw std::invalid_argument(\"\u5c0f\u6570\u70b9\u4ee5\u4e0b\u306e\u6841\u6570\u306f0\u4ee5\u4e0a\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\");\n        }\n\n        double factor = std::pow(10.0, decimals);\n        double scaled = value * factor;\n\n        switch (mode) {\n            case RoundingMode::Round:\n                return std::round(scaled) \/ factor;\n            case RoundingMode::Ceil:\n                return std::ceil(scaled) \/ factor;\n            case RoundingMode::Floor:\n                return std::floor(scaled) \/ factor;\n            case RoundingMode::Bankers:\n                return bankers_round(scaled) \/ factor;\n            default:\n                throw std::invalid_argument(\"\u4e0d\u6b63\u306a\u4e38\u3081\u30e2\u30fc\u30c9\u304c\u6307\u5b9a\u3055\u308c\u307e\u3057\u305f\");\n        }\n    }\n\nprivate:\n    static double bankers_round(double value) {\n        double integer_part;\n        double fractional_part = std::modf(value, &amp;integer_part);\n\n        if (std::abs(fractional_part) != 0.5) {\n            return std::round(value);\n        }\n\n        \/\/ \u6700\u8fd1\u63a5\u5076\u6570\u3078\u306e\u4e38\u3081\n        return (static_cast&lt;long long&gt;(integer_part) % 2 == 0) ? \n               integer_part : \n               integer_part + ((integer_part &gt; 0) ? 1 : -1);\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid demonstrate_precision_rounding() {\n    double test_value = 123.456789;\n\n    std::cout &lt;&lt; \"\u5143\u306e\u5024: \" &lt;&lt; test_value &lt;&lt; \"\\n\\n\";\n\n    \/\/ \u7570\u306a\u308b\u7cbe\u5ea6\u3067\u306e\u4e38\u3081\u51e6\u7406\n    for (int decimals = 0; decimals &lt;= 4; ++decimals) {\n        std::cout &lt;&lt; decimals &lt;&lt; \"\u6841\u3067\u306e\u4e38\u3081\u7d50\u679c:\\n\";\n        std::cout &lt;&lt; \"\u56db\u6368\u4e94\u5165: \" \n                  &lt;&lt; PrecisionRounder::round(test_value, decimals, \n                     PrecisionRounder::RoundingMode::Round) &lt;&lt; \"\\n\";\n        std::cout &lt;&lt; \"\u5207\u308a\u4e0a\u3052: \" \n                  &lt;&lt; PrecisionRounder::round(test_value, decimals, \n                     PrecisionRounder::RoundingMode::Ceil) &lt;&lt; \"\\n\";\n        std::cout &lt;&lt; \"\u5207\u308a\u6368\u3066: \" \n                  &lt;&lt; PrecisionRounder::round(test_value, decimals, \n                     PrecisionRounder::RoundingMode::Floor) &lt;&lt; \"\\n\";\n        std::cout &lt;&lt; \"\u30d0\u30f3\u30ab\u30fc\u30ba: \" \n                  &lt;&lt; PrecisionRounder::round(test_value, decimals, \n                     PrecisionRounder::RoundingMode::Bankers) &lt;&lt; \"\\n\\n\";\n    }\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u91d1\u984d\u8a08\u7b97\u306e\u305f\u3081\u306e\u7279\u6b8a\u306a\u4e38\u3081\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class MoneyRounder {\npublic:\n    enum class Currency {\n        JPY,  \/\/ \u65e5\u672c\u5186\uff081\u5186\u5358\u4f4d\uff09\n        USD,  \/\/ \u7c73\u30c9\u30eb\uff08\u30bb\u30f3\u30c8\u5358\u4f4d\uff09\n        EUR   \/\/ \u30e6\u30fc\u30ed\uff08\u30bb\u30f3\u30c8\u5358\u4f4d\uff09\n    };\n\n    static double round_currency(double amount, Currency currency) {\n        switch (currency) {\n            case Currency::JPY:\n                return std::round(amount);  \/\/ 1\u5186\u5358\u4f4d\n            case Currency::USD:\n            case Currency::EUR:\n                return std::round(amount * 100.0) \/ 100.0;  \/\/ \u30bb\u30f3\u30c8\u5358\u4f4d\n            default:\n                throw std::invalid_argument(\"\u4e0d\u6b63\u306a\u901a\u8ca8\u304c\u6307\u5b9a\u3055\u308c\u307e\u3057\u305f\");\n        }\n    }\n\n    \/\/ \u7aef\u6570\u51e6\u7406\u30eb\u30fc\u30eb\u306b\u57fa\u3065\u304f\u4e38\u3081\u51e6\u7406\n    static int round_by_rule(double amount, int unit = 1) {\n        if (unit &lt;= 0) {\n            throw std::invalid_argument(\"\u4e38\u3081\u5358\u4f4d\u306f\u6b63\u306e\u5024\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\");\n        }\n        return static_cast&lt;int&gt;(std::round(amount \/ unit) * unit);\n    }\n};<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u88c5\u4f8b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u3092\u6301\u3063\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n<div id=\"id-cbbeaeea-762c-47e8-9010-a095013e5826\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u4e38\u3081\u65b9\u5f0f<\/th><th>\u4e3b\u306a\u7528\u9014<\/th><th>\u7279\u5fb4<\/th><\/tr><\/thead><tbody><tr><td>\u56db\u6368\u4e94\u5165<\/td><td>\u4e00\u822c\u7684\u306a\u6570\u5024\u306e\u4e38\u3081<\/td><td>\u6700\u3082\u4e00\u822c\u7684\u3067\u7406\u89e3\u3057\u3084\u3059\u3044<\/td><\/tr><tr><td>\u5207\u308a\u4e0a\u3052<\/td><td>\u4e88\u7b97\u8a08\u7b97\u3001\u30ea\u30bd\u30fc\u30b9\u78ba\u4fdd<\/td><td>\u5e38\u306b\u5927\u304d\u3044\u65b9\u306b\u4e38\u3081\u308b<\/td><\/tr><tr><td>\u5207\u308a\u6368\u3066<\/td><td>\u5728\u5eab\u7ba1\u7406\u3001\u5bb9\u91cf\u8a08\u7b97<\/td><td>\u5e38\u306b\u5c0f\u3055\u3044\u65b9\u306b\u4e38\u3081\u308b<\/td><\/tr><tr><td>\u30d0\u30f3\u30ab\u30fc\u30ba\u4e38\u3081<\/td><td>\u7d71\u8a08\u51e6\u7406\u3001\u91d1\u878d\u8a08\u7b97<\/td><td>\u30d0\u30a4\u30a2\u30b9\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u4e38\u3081\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u7cbe\u5ea6\u9650\u754c\u3092\u8003\u616e\u3059\u308b<\/li>\n\n\n\n<li>\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\uff08\u6975\u5024\u3001NaN\u3001\u7121\u9650\u5927\u306a\u3069\uff09\u306e\u51e6\u7406\u3092\u9069\u5207\u306b\u884c\u3046<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u8003\u616e\u3059\u308b<\/li>\n\n\n\n<li>\u30c9\u30e1\u30a4\u30f3\u56fa\u6709\u306e\u8981\u4ef6\uff08\u901a\u8ca8\u306e\u5358\u4f4d\u306a\u3069\uff09\u3092\u53cd\u6620\u3055\u305b\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u4e38\u3081\u51e6\u7406\u306b\u304a\u3051\u308b\u6ce8\u610f\u70b9\u3068\u5bfe\u7b56\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-10\">\u4e38\u3081\u51e6\u7406\u306b\u304a\u3051\u308b\u6ce8\u610f\u70b9\u3068\u5bfe\u7b56<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">\u6d6e\u52d5\u5c0f\u6570\u70b9\u306e\u7cbe\u5ea6\u9650\u754c\u3068\u5bfe\u51e6\u6cd5<\/h3>\n\n\n\n<p>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u7cbe\u5ea6\u9650\u754c\u306f\u3001\u4e38\u3081\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306e\u91cd\u8981\u306a\u8003\u616e\u70b9\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u4e3b\u306a\u8ab2\u984c\u3068\u5bfe\u7b56\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7cbe\u5ea6\u306e\u9650\u754c\u3092\u8003\u616e\u3057\u305f\u6bd4\u8f03\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;limits&gt;\n\nclass FloatingPointComparison {\npublic:\n    \/\/ \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u6bd4\u8f03\u7528\u30a4\u30d7\u30b7\u30ed\u30f3\n    static constexpr double epsilon = std::numeric_limits&lt;double&gt;::epsilon();\n\n    \/\/ \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u7b49\u4fa1\u6027\u30c1\u30a7\u30c3\u30af\n    static bool is_approximately_equal(double a, double b, \n                                    double epsilon_multiplier = 1.0) {\n        return std::abs(a - b) &lt;= epsilon * epsilon_multiplier;\n    }\n\n    \/\/ \u4e38\u3081\u51e6\u7406\u524d\u306e\u5024\u306e\u59a5\u5f53\u6027\u30c1\u30a7\u30c3\u30af\n    static bool is_valid_for_rounding(double value) {\n        return !std::isnan(value) &amp;&amp; \n               !std::isinf(value) &amp;&amp; \n               std::abs(value) &lt;= std::numeric_limits&lt;double&gt;::max() \/ 2.0;\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid demonstrate_precision_handling() {\n    double a = 0.1 + 0.2;  \/\/ 0.30000000000000004\n    double b = 0.3;        \/\/ 0.3\n\n    std::cout &lt;&lt; \"\u76f4\u63a5\u6bd4\u8f03: \" &lt;&lt; (a == b ? \"\u7b49\u3057\u3044\" : \"\u7570\u306a\u308b\") &lt;&lt; \"\\n\";\n    std::cout &lt;&lt; \"\u30a4\u30d7\u30b7\u30ed\u30f3\u3092\u8003\u616e\u3057\u305f\u6bd4\u8f03: \" \n              &lt;&lt; (FloatingPointComparison::is_approximately_equal(a, b) ? \n                  \"\u7b49\u3057\u3044\" : \"\u7570\u306a\u308b\") &lt;&lt; \"\\n\";\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u7cbe\u5ea6\u3092\u4fdd\u8a3c\u3059\u308b\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class PreciseRounder {\npublic:\n    \/\/ \u56fa\u5b9a\u5c0f\u6570\u70b9\u8868\u73fe\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u7cbe\u5ea6\u306a\u4e38\u3081\u51e6\u7406\n    static double round_with_precision(double value, int decimals) {\n        if (!FloatingPointComparison::is_valid_for_rounding(value)) {\n            throw std::invalid_argument(\"\u4e0d\u6b63\u306a\u5165\u529b\u5024\u3067\u3059\");\n        }\n\n        \/\/ \u6574\u6570\u90e8\u3067\u306e\u8a08\u7b97\u306b\u5909\u63db\n        int64_t scale_factor = static_cast&lt;int64_t&gt;(std::pow(10, decimals));\n        int64_t scaled = static_cast&lt;int64_t&gt;(value * scale_factor + \n                        (value &gt;= 0 ? 0.5 : -0.5));\n\n        return static_cast&lt;double&gt;(scaled) \/ scale_factor;\n    }\n\n    \/\/ \u7d2f\u7a4d\u8aa4\u5dee\u3092\u9632\u3050\u305f\u3081\u306e\u5b9a\u671f\u7684\u306a\u4e38\u3081\u51e6\u7406\n    static double accumulated_sum_with_rounding(const std::vector&lt;double&gt;&amp; values, \n                                              int decimals) {\n        double sum = 0.0;\n        for (double value : values) {\n            \/\/ \u5404\u30b9\u30c6\u30c3\u30d7\u3067\u4e38\u3081\u51e6\u7406\u3092\u884c\u3044\u3001\u8aa4\u5dee\u306e\u84c4\u7a4d\u3092\u9632\u3050\n            sum = round_with_precision(sum + value, decimals);\n        }\n        return sum;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8<\/h3>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9ad8\u901f\u306a\u6574\u6570\u4e38\u3081\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class FastRounder {\npublic:\n    \/\/ \u30d3\u30c3\u30c8\u6f14\u7b97\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u901f\u306a\u5207\u308a\u6368\u3066\uff08\u6b63\u306e\u6574\u6570\u306e\u307f\uff09\n    static int fast_floor_to_power_of_two(int value, int power) {\n        int mask = (1 &lt;&lt; power) - 1;\n        return value &amp; ~mask;\n    }\n\n    \/\/ \u4e57\u9664\u7b97\u3092\u56de\u907f\u3057\u305f\u9ad8\u901f\u306a10\u306e\u7d2f\u4e57\u8a08\u7b97\n    static constexpr int64_t power_of_ten(int n) {\n        static const int64_t powers[] = {\n            1, 10, 100, 1000, 10000, 100000, 1000000, \n            10000000, 100000000, 1000000000\n        };\n        return (n &gt;= 0 &amp;&amp; n &lt; 10) ? powers[n] : \n               static_cast&lt;int64_t&gt;(std::pow(10, n));\n    }\n\n    \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6d3b\u7528\u3057\u305f\u4e38\u3081\u51e6\u7406\n    static double cached_round(double value, int decimals) {\n        static std::unordered_map&lt;int, double&gt; factor_cache;\n\n        auto it = factor_cache.find(decimals);\n        double factor = (it != factor_cache.end()) ? \n                       it-&gt;second : \n                       (factor_cache[decimals] = std::pow(10.0, decimals));\n\n        return std::round(value * factor) \/ factor;\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u4e26\u5217\u51e6\u7406\u3092\u6d3b\u7528\u3057\u305f\u5927\u91cf\u30c7\u30fc\u30bf\u306e\u4e38\u3081\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;execution&gt;\n#include &lt;algorithm&gt;\n#include &lt;vector&gt;\n\nclass ParallelRounder {\npublic:\n    \/\/ \u4e26\u5217\u51e6\u7406\u306b\u3088\u308b\u5927\u91cf\u30c7\u30fc\u30bf\u306e\u4e38\u3081\u51e6\u7406\n    static std::vector&lt;double&gt; parallel_round(const std::vector&lt;double&gt;&amp; values, \n                                            int decimals) {\n        std::vector&lt;double&gt; result(values.size());\n        double factor = std::pow(10.0, decimals);\n\n        std::transform(std::execution::par_unseq, \n                      values.begin(), values.end(), \n                      result.begin(),\n                      [factor](double value) {\n                          return std::round(value * factor) \/ factor;\n                      });\n\n        return result;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u306e\u52d5\u4f5c\u306e\u9055\u3044<\/h3>\n\n\n\n<p>\u7570\u306a\u308b\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u306e\u4e00\u8cab\u3057\u305f\u52d5\u4f5c\u3092\u4fdd\u8a3c\u3059\u308b\u305f\u3081\u306e\u8003\u616e\u70b9\u3068\u5bfe\u7b56\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u4f9d\u5b58\u306e\u554f\u984c\u306b\u5bfe\u3059\u308b\u5bfe\u7b56<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class CrossPlatformRounder {\npublic:\n    \/\/ \u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u975e\u4f9d\u5b58\u306e\u4e38\u3081\u51e6\u7406\n    static double platform_independent_round(double value) {\n        \/\/ \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u4e38\u3081\u65b9\u5f0f\u3092\u660e\u793a\u7684\u306b\u6307\u5b9a\n        return std::rint(value);\n    }\n\n    \/\/ \u4e38\u3081\u30e2\u30fc\u30c9\u306e\u660e\u793a\u7684\u306a\u5236\u5fa1\n    class ScopedRoundingMode {\n    public:\n        ScopedRoundingMode(int mode) {\n            old_mode = std::fegetround();\n            std::fesetround(mode);\n        }\n\n        ~ScopedRoundingMode() {\n            std::fesetround(old_mode);\n        }\n\n    private:\n        int old_mode;\n    };\n\n    \/\/ \u4e38\u3081\u30e2\u30fc\u30c9\u3092\u6307\u5b9a\u3057\u305f\u51e6\u7406\n    static double round_with_mode(double value, int mode) {\n        ScopedRoundingMode scope(mode);\n        return std::rint(value);\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u9593\u306e\u5dee\u7570\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class RoundingTester {\npublic:\n    \/\/ \u5404\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u306e\u52d5\u4f5c\u3092\u691c\u8a3c\n    static void verify_platform_behavior() {\n        std::cout &lt;&lt; \"\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u60c5\u5831:\\n\"\n                  &lt;&lt; \"epsilon: \" &lt;&lt; std::numeric_limits&lt;double&gt;::epsilon() &lt;&lt; \"\\n\"\n                  &lt;&lt; \"\u4e38\u3081\u30e2\u30fc\u30c9: \" &lt;&lt; std::fegetround() &lt;&lt; \"\\n\"\n                  &lt;&lt; \"\u6700\u5927\u7cbe\u5ea6: \" &lt;&lt; std::numeric_limits&lt;double&gt;::digits10 &lt;&lt; \"\\n\";\n\n        \/\/ \u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u30b1\u30fc\u30b9\u306e\u30c6\u30b9\u30c8\n        test_critical_values();\n    }\n\nprivate:\n    static void test_critical_values() {\n        double test_values[] = {\n            0.5, -0.5,                    \/\/ \u57fa\u672c\u7684\u306a\u5883\u754c\u5024\n            0.49999999999999994,          \/\/ 0.5\u306b\u975e\u5e38\u306b\u8fd1\u3044\u5024\n            std::nextafter(0.5, 0.0),     \/\/ 0.5\u306e\u3059\u3050\u4e0b\u306e\u5024\n            std::nextafter(0.5, 1.0)      \/\/ 0.5\u306e\u3059\u3050\u4e0a\u306e\u5024\n        };\n\n        for (double value : test_values) {\n            std::cout &lt;&lt; \"\u5024: \" &lt;&lt; value &lt;&lt; \"\\n\"\n                      &lt;&lt; \"  std::round: \" &lt;&lt; std::round(value) &lt;&lt; \"\\n\"\n                      &lt;&lt; \"  std::rint: \" &lt;&lt; std::rint(value) &lt;&lt; \"\\n\"\n                      &lt;&lt; \"  std::nearbyint: \" &lt;&lt; std::nearbyint(value) &lt;&lt; \"\\n\";\n        }\n    }\n};<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u4e3b\u306a\u6ce8\u610f\u70b9\u3092\u307e\u3068\u3081\u308b\u3068\uff1a<\/p>\n\n\n<div id=\"id-4866e5da-9b9a-4c87-8c31-3e32bb91b2c2\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5206\u985e<\/th><th>\u6ce8\u610f\u70b9<\/th><th>\u5bfe\u7b56<\/th><\/tr><\/thead><tbody><tr><td>\u7cbe\u5ea6<\/td><td>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u6bd4\u8f03<\/td><td>\u30a4\u30d7\u30b7\u30ed\u30f3\u3092\u8003\u616e\u3057\u305f\u6bd4\u8f03\u51e6\u7406<\/td><\/tr><tr><td>\u7cbe\u5ea6<\/td><td>\u7d2f\u7a4d\u8aa4\u5dee<\/td><td>\u5b9a\u671f\u7684\u306a\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u65bd<\/td><\/tr><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u8a08\u7b97\u30b3\u30b9\u30c8<\/td><td>\u30d3\u30c3\u30c8\u6f14\u7b97\u3084\u7d2f\u4e57\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u5316<\/td><\/tr><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u5927\u91cf\u30c7\u30fc\u30bf\u51e6\u7406<\/td><td>\u4e26\u5217\u51e6\u7406\u306e\u6d3b\u7528<\/td><\/tr><tr><td>\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0<\/td><td>\u4e38\u3081\u30e2\u30fc\u30c9\u306e\u9055\u3044<\/td><td>\u660e\u793a\u7684\u306a\u30e2\u30fc\u30c9\u6307\u5b9a<\/td><\/tr><tr><td>\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0<\/td><td>\u7cbe\u5ea6\u306e\u9055\u3044<\/td><td>\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u975e\u4f9d\u5b58\u306e\u5b9f\u88c5<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u77e5\u8b58\u3092\u6d3b\u7528\u3057\u305f\u5b9f\u8df5\u7684\u306a\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-14\">\u5b9f\u8df5\u7684\u306a\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u4f7f\u7528\u3057\u305f\u6c4e\u7528\u7684\u306a\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u578b\u306b\u4f9d\u5b58\u3057\u306a\u3044\u67d4\u8edf\u306a\u4e38\u3081\u51e6\u7406\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u57fa\u672c\u7684\u306a\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u5b9f\u88c5<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;type_traits&gt;\n#include &lt;cmath&gt;\n\ntemplate&lt;typename T&gt;\nclass GenericRounder {\n    \/\/ \u578b\u306e\u59a5\u5f53\u6027\u30c1\u30a7\u30c3\u30af\n    static_assert(std::is_arithmetic&lt;T&gt;::value, \n                 \"\u7b97\u8853\u578b\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\");\n\npublic:\n    \/\/ \u57fa\u672c\u7684\u306a\u4e38\u3081\u51e6\u7406\n    static T round_to_precision(T value, int decimals) {\n        static_assert(std::is_floating_point&lt;T&gt;::value, \n                     \"\u6d6e\u52d5\u5c0f\u6570\u70b9\u578b\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\");\n\n        T factor = std::pow(T(10), decimals);\n        return std::round(value * factor) \/ factor;\n    }\n\n    \/\/ \u6307\u5b9a\u3055\u308c\u305f\u500d\u6570\u3078\u306e\u4e38\u3081\n    template&lt;typename U = T&gt;\n    static typename std::enable_if&lt;std::is_integral&lt;U&gt;::value, U&gt;::type\n    round_to_multiple(U value, U multiple) {\n        return ((value + multiple \/ 2) \/ multiple) * multiple;\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid demonstrate_generic_rounding() {\n    \/\/ \u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e\u4e38\u3081\n    double d_value = 123.456789;\n    float f_value = 123.456f;\n    std::cout &lt;&lt; \"double\u578b\u306e\u4e38\u3081: \" \n              &lt;&lt; GenericRounder&lt;double&gt;::round_to_precision(d_value, 2) &lt;&lt; \"\\n\";\n    std::cout &lt;&lt; \"float\u578b\u306e\u4e38\u3081: \" \n              &lt;&lt; GenericRounder&lt;float&gt;::round_to_precision(f_value, 2) &lt;&lt; \"\\n\";\n\n    \/\/ \u6574\u6570\u306e\u4e38\u3081\n    int i_value = 123;\n    std::cout &lt;&lt; \"int\u578b\u306e\u500d\u6570\u4e38\u3081: \" \n              &lt;&lt; GenericRounder&lt;int&gt;::round_to_multiple(i_value, 10) &lt;&lt; \"\\n\";\n}<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u9ad8\u5ea6\u306a\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u5b9f\u88c5<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">template&lt;typename T, \n         template&lt;typename&gt; class RoundingPolicy = DefaultRoundingPolicy&gt;\nclass AdvancedRounder {\npublic:\n    using value_type = T;\n    using policy_type = RoundingPolicy&lt;T&gt;;\n\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u4e38\u3081\u65b9\u5f0f\u3092\u8a2d\u5b9a\n    explicit AdvancedRounder(int decimals = 0) \n        : decimals_(decimals), policy_() {}\n\n    \/\/ \u4e38\u3081\u51e6\u7406\u306e\u5b9f\u884c\n    T round(T value) const {\n        return policy_.round(value, decimals_);\n    }\n\n    \/\/ \u8907\u6570\u5024\u306e\u4e00\u62ec\u4e38\u3081\u51e6\u7406\n    template&lt;typename Container&gt;\n    Container round_all(const Container&amp; values) const {\n        Container result;\n        result.reserve(values.size());\n\n        std::transform(values.begin(), values.end(), \n                      std::back_inserter(result),\n                      [this](const T&amp; val) { return this-&gt;round(val); });\n\n        return result;\n    }\n\nprivate:\n    int decimals_;\n    policy_type policy_;\n};\n\n\/\/ \u4e38\u3081\u65b9\u5f0f\u306e\u30dd\u30ea\u30b7\u30fc\u30af\u30e9\u30b9\ntemplate&lt;typename T&gt;\nclass DefaultRoundingPolicy {\npublic:\n    T round(T value, int decimals) const {\n        T factor = std::pow(T(10), decimals);\n        return std::round(value * factor) \/ factor;\n    }\n};\n\ntemplate&lt;typename T&gt;\nclass BankersRoundingPolicy {\npublic:\n    T round(T value, int decimals) const {\n        T factor = std::pow(T(10), decimals);\n        T scaled = value * factor;\n        return std::rint(scaled) \/ factor;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">SIMD\u30b3\u30de\u30f3\u30c9\u3092\u6d3b\u7528\u3057\u305f\u9ad8\u901f\u306a\u4e38\u3081\u51e6\u7406\u306e\u5b9f\u73fe<\/h3>\n\n\n\n<p>SIMD\u547d\u4ee4\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4e38\u3081\u51e6\u7406\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;immintrin.h&gt;\n#include &lt;vector&gt;\n\nclass SimdRounder {\npublic:\n    \/\/ AVX2\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u901f\u306a\u4e38\u3081\u51e6\u7406\n    static void round_array_avx2(double* data, size_t size) {\n        \/\/ 8\u30d0\u30a4\u30c8\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u30c1\u30a7\u30c3\u30af\n        if (reinterpret_cast&lt;uintptr_t&gt;(data) % 8 != 0) {\n            throw std::runtime_error(\"\u30c7\u30fc\u30bf\u304c\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3055\u308c\u3066\u3044\u307e\u305b\u3093\");\n        }\n\n        size_t i = 0;\n\n        \/\/ AVX2\u306b\u3088\u308b4\u8981\u7d20\u540c\u6642\u51e6\u7406\n        for (; i + 4 &lt;= size; i += 4) {\n            __m256d vec = _mm256_load_pd(data + i);\n            vec = _mm256_round_pd(vec, _MM_FROUND_TO_NEAREST_INT);\n            _mm256_store_pd(data + i, vec);\n        }\n\n        \/\/ \u6b8b\u308a\u306e\u8981\u7d20\u3092\u901a\u5e38\u306e\u65b9\u6cd5\u3067\u51e6\u7406\n        for (; i &lt; size; ++i) {\n            data[i] = std::round(data[i]);\n        }\n    }\n\n    \/\/ SIMD\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u901f\u306a\u56fa\u5b9a\u5c0f\u6570\u70b9\u4e38\u3081\u51e6\u7406\n    static std::vector&lt;double&gt; round_to_decimals_simd(\n        const std::vector&lt;double&gt;&amp; values, int decimals) {\n        std::vector&lt;double&gt; result(values.size());\n        double factor = std::pow(10.0, decimals);\n\n        size_t i = 0;\n        __m256d factor_vec = _mm256_set1_pd(factor);\n        __m256d inv_factor_vec = _mm256_set1_pd(1.0 \/ factor);\n\n        for (; i + 4 &lt;= values.size(); i += 4) {\n            __m256d vec = _mm256_load_pd(values.data() + i);\n            vec = _mm256_mul_pd(vec, factor_vec);\n            vec = _mm256_round_pd(vec, _MM_FROUND_TO_NEAREST_INT);\n            vec = _mm256_mul_pd(vec, inv_factor_vec);\n            _mm256_store_pd(result.data() + i, vec);\n        }\n\n        for (; i &lt; values.size(); ++i) {\n            result[i] = std::round(values[i] * factor) \/ factor;\n        }\n\n        return result;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u5358\u4f53\u30c6\u30b9\u30c8\u3067\u78ba\u8a8d\u3059\u3079\u304d\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9<\/h3>\n\n\n\n<p>\u4e38\u3081\u51e6\u7406\u306e\u4fe1\u983c\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;gtest\/gtest.h&gt;\n#include &lt;limits&gt;\n#include &lt;cmath&gt;\n\nclass RoundingTests : public ::testing::Test {\nprotected:\n    static constexpr double epsilon = std::numeric_limits&lt;double&gt;::epsilon();\n\n    \/\/ \u5024\u306e\u8fd1\u4f3c\u7684\u306a\u6bd4\u8f03\n    bool is_approximately_equal(double a, double b, \n                              double epsilon_multiplier = 1.0) {\n        return std::abs(a - b) &lt;= epsilon * epsilon_multiplier;\n    }\n};\n\nTEST_F(RoundingTests, BasicRoundingTests) {\n    \/\/ \u57fa\u672c\u7684\u306a\u30b1\u30fc\u30b9\n    EXPECT_EQ(std::round(3.3), 3.0);\n    EXPECT_EQ(std::round(3.7), 4.0);\n    EXPECT_EQ(std::round(-3.3), -3.0);\n    EXPECT_EQ(std::round(-3.7), -4.0);\n}\n\nTEST_F(RoundingTests, EdgeCases) {\n    \/\/ \u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\n    EXPECT_EQ(std::round(0.0), 0.0);\n    EXPECT_EQ(std::round(-0.0), -0.0);\n    EXPECT_TRUE(std::isnan(std::round(std::nan(\"\"))));\n    EXPECT_EQ(std::round(std::numeric_limits&lt;double&gt;::infinity()),\n              std::numeric_limits&lt;double&gt;::infinity());\n}\n\nTEST_F(RoundingTests, PrecisionCriticalCases) {\n    \/\/ \u7cbe\u5ea6\u304c\u91cd\u8981\u306a\u30b1\u30fc\u30b9\n    double almost_half = 0.5 - epsilon;\n    double just_over_half = 0.5 + epsilon;\n\n    EXPECT_EQ(std::round(0.5), 0.0);  \/\/ \u30d0\u30f3\u30ab\u30fc\u30ba\u4e38\u3081\u306e\u5834\u5408\n    EXPECT_EQ(std::round(almost_half), 0.0);\n    EXPECT_EQ(std::round(just_over_half), 1.0);\n}\n\nTEST_F(RoundingTests, LargeNumberTests) {\n    \/\/ \u5927\u304d\u306a\u6570\u5024\u306e\u30c6\u30b9\u30c8\n    double large_number = std::numeric_limits&lt;double&gt;::max() \/ 2.0;\n    EXPECT_NO_THROW(std::round(large_number));\n\n    double small_number = std::numeric_limits&lt;double&gt;::min();\n    EXPECT_NO_THROW(std::round(small_number));\n}\n\n\/\/ \u30ab\u30b9\u30bf\u30e0\u5b9f\u88c5\u306e\u30c6\u30b9\u30c8\u4f8b\nTEST_F(RoundingTests, CustomImplementationTests) {\n    \/\/ GenericRounder\u306e\u30c6\u30b9\u30c8\n    double test_value = 123.456789;\n    auto rounded = GenericRounder&lt;double&gt;::round_to_precision(test_value, 2);\n    EXPECT_TRUE(is_approximately_equal(rounded, 123.46));\n\n    \/\/ AdvancedRounder\u306e\u30c6\u30b9\u30c8\n    AdvancedRounder&lt;double&gt; rounder(2);\n    EXPECT_TRUE(is_approximately_equal(rounder.round(test_value), 123.46));\n\n    \/\/ SIMDRounder\u306e\u30c6\u30b9\u30c8\n    std::vector&lt;double&gt; test_values = {1.1, 2.2, 3.3, 4.4};\n    auto simd_result = SimdRounder::round_to_decimals_simd(test_values, 1);\n    EXPECT_EQ(simd_result.size(), test_values.size());\n    EXPECT_TRUE(is_approximately_equal(simd_result[0], 1.1));\n}<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u4e3b\u306a\u30dd\u30a4\u30f3\u30c8\u3092\u307e\u3068\u3081\u308b\u3068\uff1a<\/p>\n\n\n<div id=\"id-adb8b92e-13a6-4768-983a-d43988e8c8d0\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5b9f\u88c5\u30a2\u30d7\u30ed\u30fc\u30c1<\/th><th>\u30e1\u30ea\u30c3\u30c8<\/th><th>\u30c7\u30e1\u30ea\u30c3\u30c8<\/th><th>\u4f7f\u7528\u30b7\u30fc\u30f3<\/th><\/tr><\/thead><tbody><tr><td>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u5b9f\u88c5<\/td><td>\u578b\u306e\u6c4e\u7528\u6027\u304c\u9ad8\u3044<\/td><td>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u9593\u304c\u5897\u52a0<\/td><td>\u7570\u306a\u308b\u6570\u5024\u578b\u3067\u306e\u5229\u7528<\/td><\/tr><tr><td>SIMD\u5b9f\u88c5<\/td><td>\u51e6\u7406\u304c\u9ad8\u901f<\/td><td>\u5b9f\u88c5\u304c\u8907\u96d1<\/td><td>\u5927\u91cf\u30c7\u30fc\u30bf\u306e\u51e6\u7406<\/td><\/tr><tr><td>\u30dd\u30ea\u30b7\u30fc\u30d9\u30fc\u30b9<\/td><td>\u67d4\u8edf\u306a\u52d5\u4f5c\u5909\u66f4<\/td><td>\u8a2d\u8a08\u304c\u8907\u96d1\u5316<\/td><td>\u8981\u4ef6\u5909\u66f4\u304c\u591a\u3044\u5834\u5408<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u7279\u6b8a\u5316\u3067\u578b\u3054\u3068\u306e\u6700\u9069\u306a\u5b9f\u88c5\u3092\u63d0\u4f9b<\/li>\n\n\n\n<li>SIMD\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u306b\u6ce8\u610f<\/li>\n\n\n\n<li>\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u3092\u7db2\u7f85\u7684\u306b\u30c6\u30b9\u30c8<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u8003\u616e<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u3067\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u4e38\u3081\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\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":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":{"0":"post-2111","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-cpp","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2111","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=2111"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2111\/revisions"}],"predecessor-version":[{"id":2112,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2111\/revisions\/2112"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2111"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2111"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2111"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}