{"id":682,"date":"2022-08-22T11:55:18","date_gmt":"2022-08-12T01:15:20","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/c-c%e3%81%ab%e3%81%8a%e3%81%84%e3%81%a6int_max%e3%81%a8int_min%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%99%e3%82%8b\/"},"modified":"2025-08-01T01:37:25","modified_gmt":"2025-07-31T16:37:25","slug":"c-c%e3%81%ab%e3%81%8a%e3%81%84%e3%81%a6int_max%e3%81%a8int_min%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c-c%e3%81%ab%e3%81%8a%e3%81%84%e3%81%a6int_max%e3%81%a8int_min%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%99%e3%82%8b\/","title":{"rendered":"C\/C++\u306b\u304a\u3044\u3066INT_MAX\u3068INT_MIN\u3092\u4f7f\u7528\u3059\u308b"},"content":{"rendered":"<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001C\/C++\u3067INT_MAX\u3068INT_MIN\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u306b\u5f79\u7acb\u3064\u6700\u5927\u304a\u3088\u3073\u6700\u5c0f\u306e\u6574\u6570\u5024\u3092\u8868\u3059\u30de\u30af\u30ed\u3067\u3059\u3002 (Jissai ni yakudatsu saidai oyobi saish\u014d no seisu-chi o arawasu makuro desu.)<\/p>\n<p>\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u4f7f\u3063\u3066\u3001\u305d\u308c\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<hr \/>\n<h2>INT_MAX\u3068INT_MIN\u3092\u4f7f\u7528\u3059\u308b<\/h2>\n<p>INT_MAX\u306f\u3001\u6700\u5927\u306e\u6574\u6570\u5024\u3092\u8868\u3059\u30de\u30af\u30ed\u3067\u3059\u3002\u540c\u69d8\u306b\u3001INT_MIN\u306f\u6700\u5c0f\u306e\u6574\u6570\u5024\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u306e\u30de\u30af\u30ed\u306f\u30d8\u30c3\u30c0\u30d5\u30a1\u30a4\u30eb\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u305d\u308c\u3092\u30a4\u30f3\u30af\u30eb\u30fc\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;limits.h&gt;<\/span><\/span>\r\n\r\nINT_MAX\r\n\r\nINT_MIN\r\n<\/code><\/pre>\n<p>\u6574\u6570\u578b\u306e\u5909\u6570\u306f\u3001INT_MIN\u3068INT_MAX\u306e\u9593\u306b\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u901a\u5e38\u3001\u6574\u6570\u306f4\u30d0\u30a4\u30c8\uff0832\u30d3\u30c3\u30c8\uff09\u3068\u3057\u3066\u4fdd\u5b58\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u307b\u3068\u3093\u3069\u3059\u3079\u3066\u306e\u6a5f\u68b0\u306b\u304a\u3044\u3066\u3001\u6700\u5927\u306e\u6574\u6570\u5024\u306f2^(31) &#8211; 1 = +2147483647\u306b\u306a\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>\u6700\u5c0f\u306e\u6574\u6570\u5024\u306f-(2^31) = -2147483648\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u79c1\u305f\u3061\u306e\u6a5f\u68b0\u3067\u3053\u308c\u3092\u691c\u8a3c\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;limits.h&gt;<\/span><\/span>\r\n\r\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Maximum Integer Value: %d\\n\"<\/span><span class=\"token punctuation\">,<\/span> INT_MAX<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Minimum Integer Value: %d\\n\"<\/span><span class=\"token punctuation\">,<\/span> INT_MIN<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u51fa\u529b<\/p>\n<pre class=\"post-pre\"><code>Maximum Integer Value: 2147483647\r\nMinimum Integer Value: -2147483648\r\n<\/code><\/pre>\n<p>\u5b9f\u969b\u306b\u3001\u4e88\u6e2c\u901a\u308a\u306e\u7d50\u679c\u3092\u5f97\u308b\u3002 (Jissai ni, yosoku doori no kekka o eru.)<\/p>\n<p>\u3067\u306f\u3001\u3082\u30461\u3064\u5225\u306e\u4f8b\u3092\u6319\u3052\u3066\u3001\u6574\u6570\u306e\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3084\u30a2\u30f3\u30c0\u30fc\u30d5\u30ed\u30fc\u3092\u6b63\u3057\u304f\u4e88\u6e2c\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;limits.h&gt;<\/span><\/span>\r\n\r\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">int<\/span> value <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>value <span class=\"token operator\">&gt;=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token comment\">\/\/ Check for overflow<\/span>\r\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>value <span class=\"token operator\">==<\/span> INT_MAX<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"value = %d. Possible overflow!\\n\"<\/span><span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        value <span class=\"token operator\">++<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Now, value = %d\\n\"<\/span><span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    value <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>value <span class=\"token operator\">&lt;=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token comment\">\/\/ Check for underflow<\/span>\r\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>value <span class=\"token operator\">==<\/span> INT_MIN<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"value = %d. Possible underflow!\\n\"<\/span><span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        value <span class=\"token operator\">--<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Now, value = %d\\n\"<\/span><span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u51fa\u529b<\/p>\n<pre class=\"post-pre\"><code>value = 2147483647. Possible overflow!\r\nNow, value = -2147483648\r\nvalue = -2147483648. Possible underflow!\r\nNow, value = 2147483647\r\n<\/code><\/pre>\n<p>\u3053\u308c\u306f\u5b9f\u884c\u306b\u6570\u79d2\u307b\u3069\u304b\u304b\u308a\u307e\u3059\u304c\u3001\u79c1\u305f\u3061\u304c\u671f\u5f85\u3059\u308b\u3068\u304a\u308a\u306e\u7d50\u679c\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/p>\n<p>\u6574\u6570\u306fINT_MIN\u306b\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3057\u3001INT_MAX\u306b\u30a2\u30f3\u30c0\u30fc\u30d5\u30ed\u30fc\u3057\u307e\u3059\u3002<\/p>\n<p>\u5024\u306e\u5909\u52d5\u3092\u691c\u51fa\u3059\u308b\u306e\u306b\u5f79\u7acb\u3064\u3002<\/p>\n<hr \/>\n<h2>\u306a\u305c\u3053\u308c\u3089\u306e\u30de\u30af\u30ed\u304c\u5fc5\u8981\u306a\u306e\u3067\u3059\u304b? (Naze korera no makuro ga hitsuy\u014dna nodesu ka?)<\/h2>\n<p>\u7279\u5b9a\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u306f\u3001\u6642\u3005\u5909\u6570\u3092\u6700\u5c0f\u5024\/\u6700\u5927\u5024\u3068\u3057\u3066\u521d\u671f\u5316\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u30c7\u30fc\u30bf\u578b\u306e\u30d3\u30c3\u30c8\u6570\u306f\u3001\u30de\u30b7\u30f3\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u6700\u5927\uff0f\u6700\u5c0f\u5024\u306e\u4f7f\u7528\u304c\u4e00\u8cab\u3057\u305f\u3082\u306e\u306b\u306a\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3001\u7686\u304c\u540c\u3058\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3067\u304d\u308c\u3070\u4fbf\u5229\u3067\u3059\uff01<\/p>\n<p>\u3053\u308c\u304c\u307e\u3055\u306b\u3001\u3053\u306e\u3088\u3046\u306a\u30de\u30af\u30ed\u304c\u5b58\u5728\u3059\u308b\u7406\u7531\u306a\u306e\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>To spare you from remember the actual values<\/li>\n<li>Have consistent programming patterns across all machines<\/li>\n<li>Very convenient to use<\/li>\n<\/ul>\n<p>\u3042\u306a\u305f\u304c\u81ea\u5206\u306eC\/C++\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u69cb\u7bc9\u3059\u308b\u969b\u306b\u3001\u3053\u306e\u3088\u3046\u306a\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3059\u308b\u7406\u7531\u304c\u3042\u306a\u305f\u3092\u8aac\u5f97\u3059\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<hr \/>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001C \/ C++\u3067INT_MAX\u304a\u3088\u3073INT_MIN\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u305f\u3002<\/p>\n<p>\u540c\u69d8\u306e\u5185\u5bb9\u306b\u3064\u3044\u3066\u306f\u3001\u5f53\u793e\u306eC\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u30bb\u30af\u30b7\u30e7\u30f3\u3092\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u53c2\u8003\u6587\u732e<\/h2>\n<ul class=\"post-ul\">\n<li>cplusplus.com page on climits<\/li>\n<\/ul>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001C\/C++\u3067INT_MAX\u3068INT_MIN\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002 \u5b9f\u969b\u306b\u5f79\u7acb\u3064\u6700\u5927\u304a\u3088\u3073\u6700\u5c0f\u306e\u6574\u6570\u5024\u3092\u8868\u3059\u30de\u30af\u30ed\u3067\u3059\u3002 (Jissai ni yakudatsu saidai oyobi sa [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-682","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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