{"id":596,"date":"2020-09-05T14:09:06","date_gmt":"2020-09-05T05:09:06","guid":{"rendered":"https:\/\/naoya-ono.com\/swift\/?p=596"},"modified":"2020-09-05T14:09:06","modified_gmt":"2020-09-05T05:09:06","slug":"decimal-or-not","status":"publish","type":"post","link":"https:\/\/naoya-ono.com\/swift\/decimal-or-not\/","title":{"rendered":"\u3010Swift\u3011Float \/ Double\u578b\u306e\u6570\u5024\u304c\u5c0f\u6570\u3092\u542b\u3080\u304b\u3069\u3046\u304b\u5224\u5225\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>\u3053\u306e\u30da\u30fc\u30b8\u3067\u306f\u3001Float\u3084Double\u578b\u306e\u6570\u5024\u306b\u5c0f\u6570\u304c\u542b\u307e\u308c\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5225\u3059\u308b\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">Contents<\/p><ul class=\"toc_list\"><li><a href=\"#i\">\u5b9f\u88c5\u65b9\u6cd5<\/a><ul><li><a href=\"#STEP1\">STEP1. \u5c0f\u6570\u90e8\u5206\u306e\u629c\u304d\u51fa\u3057<\/a><\/li><li><a href=\"#STEP2_0\">STEP2. \u5c0f\u6570\u90e8\u5206\u304c0\u3088\u308a\u5927\u304d\u3044\u304b\u6bd4\u8f03<\/a><\/li><\/ul><\/li><li><a href=\"#i-2\">\u8ca0\u306e\u6570\u3082\u8003\u616e\u3059\u308b\u5834\u5408<\/a><\/li><\/ul><\/div>\n<h2 class=\"hh hh5 pastel-bc\" id=\"i-0\"><span id=\"i\">\u5b9f\u88c5\u65b9\u6cd5<\/span><\/h2>\n<h3 id=\"i-1\"><span id=\"STEP1\">STEP1. \u5c0f\u6570\u90e8\u5206\u306e\u629c\u304d\u51fa\u3057<\/span><\/h3>\n<p>\u307e\u305a\u306f<span class=\"keiko_yellow\"><strong> truncatingRemainder<\/strong> <\/span>\u3092\u4f7f\u3063\u3066\u5c0f\u6570\u90e8\u5206\u3092\u629c\u304d\u51fa\u3055\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-swift\" data-lang=\"Swift\"><code>let decimal = result.truncatingRemainder(dividingBy: 1)\n\n\/\/ \u4f8b\nresult\u306e\u5024\uff1a123.45 \u2192 decimal\u306e\u5024\uff1a0.45\nresult\u306e\u5024\uff1a123 \u2192 decimal\u306e\u5024\uff1a0.0<\/code><\/pre>\n<\/div>\n<p>\u4e0a\u8a18\u306e\u4f8b\u306e\u3088\u3046\u306bresult\u304c\u5c0f\u6570\u3092\u542b\u3080\u5834\u5408\u306f\u5c0f\u6570\u90e8\u5206\u304c\u53d6\u5f97\u3067\u304d\u3001\u542b\u307e\u306a\u3044\u5834\u5408\u306e\u7d50\u679c\u306f0.0\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/developer.apple.com\/documentation\/swift\/floatingpoint\/3017995-truncatingremainder\" class=\"btn raised blue-bc strong\">truncatingRemainder(dividingBy:)\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/a><\/p>\n<h3 id=\"i-2\"><span id=\"STEP2_0\">STEP2. \u5c0f\u6570\u90e8\u5206\u304c0\u3088\u308a\u5927\u304d\u3044\u304b\u6bd4\u8f03<\/span><\/h3>\n<p>\u6b21\u306e\u53d6\u308a\u51fa\u3057\u305f\u5c0f\u6570\u90e8\u5206\u304c0\u3088\u308a\u3082\u5927\u304d\u3044\u306e\u304b\u6bd4\u8f03\u3057\u307e\u3059\u3002<\/p>\n<p>0\u3088\u308a\u3082\u5927\u304d\u3051\u308c\u3070\u5c0f\u6570\u70b9\u3092\u542b\u3080\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u6bd4\u8f03\u306b\u306f<strong><span class=\"keiko_yellow\"> is<wbr>Less(than:)<\/span><\/strong> \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u6b21\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-swift\" data-lang=\"Swift\"><code>let decimal = result.truncatingRemainder(dividingBy: 1)\n\nif decimal.<span class=\"s1\">truncatingRemainder<\/span>(dividingBy: <span class=\"s2\">1<\/span>).<span class=\"s1\">isLess<\/span>(than: .<span class=\"s1\">ulpOfOne<\/span>) {\n   print(\"\u5c0f\u6570\u306a\u3057\")\n} else {\n   print(\"\u5c0f\u6570\u3042\u308a\")\n}<\/code><\/pre>\n<\/div>\n<p class=\"p1\">isLess(than:)\u306f\u6307\u5b9a\u3057\u305f\u5f15\u6570\u306e\u6570\u5024\u3088\u308a\u3082\u5c0f\u3055\u3044\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3001\u7d50\u679c\u3092Bool\u5024\u3067\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u6d6e\u52d5\u5c0f\u6570<span>\u70b9\u306e\u30a4\u30b3\u30fc\u30eb\u30c1\u30a7\u30c3\u30af\u306b\u306fEPSILON\u3092\u4f7f\u3044\u307e\u3059\u304c\u3001Swift\u3067\u306f\u300c<\/span><span class=\"s1\">.<\/span>ulpOfOne<span>\u300d\u3068\u66f8\u304f\u306e\u3067\u3001\u5f15\u6570\u306b\u300c<\/span><span class=\"s1\">.<\/span>ulpOfOne<span>\u300d\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/span><\/p>\n<p><a href=\"https:\/\/developer.apple.com\/documentation\/swift\/double\/1848172-isless\" class=\"btn raised blue-bc strong\">isLess(than:)\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/a><br \/>\n<script src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\" async><\/script><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block; text-align: center;\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\" data-ad-client=\"ca-pub-4166043434922569\" data-ad-slot=\"7750996733\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/p>\n<h2 class=\"hh hh5 pastel-bc\" id=\"i-3\"><span id=\"i-2\">\u8ca0\u306e\u6570\u3082\u8003\u616e\u3059\u308b\u5834\u5408<\/span><\/h2>\n<p>\u5148\u307b\u3069\u306e\u65b9\u6cd5\u3067\u306f\u3001\u8ca0\u306e\u6570\u3092\u8003\u616e\u3057\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u30c1\u30a7\u30c3\u30af\u3059\u308b\u6570\u5024\u304c\u300c-12.345\u300d\u3060\u3063\u305f\u3068\u3059\u308b\u3068\u3001<\/p>\n<div class=\"sng-box box8\">\n<p>\u5c0f\u6570\u90e8\u5206\u306e\u629c\u304d\u51fa\u3057\u7d50\u679c\uff1a-0.345<br \/>\nisLess(than:)\u306e\u7d50\u679c\uff1atrue<\/p>\n<\/div>\n<p>\u3068\u306a\u308a\u3001\u5c0f\u6570\u304c\u3042\u308b\u306e\u306b\u3001\u5c0f\u6570\u304c\u7121\u3044\u3068\u5224\u5b9a\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092\u9632\u3050\u306b\u306f\u3001<span class=\"keiko_yellow\"><strong>abs(_:)<\/strong> <\/span>\u3092\u4f7f\u3063\u3066\u7d76\u5bfe\u5024\u3092\u7b97\u51fa\uff08\u30de\u30a4\u30ca\u30b9\u3092\u53d6\u308a\u9664\u304f\uff09\u3057\u3066\u304b\u3089\u3001isLess(than:)\u3067\u30c1\u30a7\u30c3\u30af\u3092\u3059\u308c\u3070OK\u3067\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-swift\" data-lang=\"Swift\"><code>let decimal = result.truncatingRemainder(dividingBy: 1)\n\nif abs(decimal.<span class=\"s1\">truncatingRemainder<\/span>(dividingBy: <span class=\"s2\">1<\/span>)).<span class=\"s1\">isLess<\/span>(than: .<span class=\"s1\">ulpOfOne<\/span>) {\n   print(\"\u5c0f\u6570\u306a\u3057\")\n} else {\n   print(\"\u5c0f\u6570\u3042\u308a\")\n}\n<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u306e\u30da\u30fc\u30b8\u3067\u306f\u3001Float\u3084Double\u578b\u306e\u6570\u5024\u306b\u5c0f\u6570\u304c\u542b\u307e\u308c\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5225\u3059\u308b\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002 Contents\u5b9f\u88c5\u65b9\u6cd5STEP1. \u5c0f\u6570\u90e8\u5206\u306e\u629c\u304d\u51fa\u3057STEP2. \u5c0f\u6570\u90e8\u5206\u304c0\u3088\u308a\u5927\u304d\u3044\u304b\u6bd4\u8f03\u8ca0\u306e\u6570\u3082\u8003\u616e\u3059\u308b\u5834\u5408 &#8230; <\/p>\n","protected":false},"author":1,"featured_media":598,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/posts\/596"}],"collection":[{"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/comments?post=596"}],"version-history":[{"count":2,"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/posts\/596\/revisions"}],"predecessor-version":[{"id":602,"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/posts\/596\/revisions\/602"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/media\/598"}],"wp:attachment":[{"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/media?parent=596"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/categories?post=596"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/naoya-ono.com\/swift\/wp-json\/wp\/v2\/tags?post=596"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}