{"id":972,"date":"2018-11-21T12:00:53","date_gmt":"2018-11-21T03:00:53","guid":{"rendered":"https:\/\/www.bold.ne.jp\/engineer-club\/?p=972"},"modified":"2025-09-17T13:52:12","modified_gmt":"2025-09-17T04:52:12","slug":"c-pointer","status":"publish","type":"post","link":"https:\/\/www.bold.ne.jp\/engineer-club\/c-pointer","title":{"rendered":"C\u8a00\u8a9e\u306e\u30dd\u30a4\u30f3\u30bf\u3068\u306f\uff1f\u8a18\u8ff0\u6cd5\u3068\u914d\u5217\u3001\u69cb\u9020\u4f53\u3001\u95a2\u6570\u3078\u306e\u6e21\u3057\u65b9"},"content":{"rendered":"<p>C\u8a00\u8a9e\u3092\u6271\u3046\u4e0a\u3067\u3001\u30dd\u30a4\u30f3\u30bf\u306f\u907f\u3051\u3066\u901a\u308c\u306a\u3044\u90e8\u5206\u3067\u3059\u3002\u4e0a\u624b\u306b\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308c\u3070\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u5e45\u304c\u5e83\u304c\u308a\u3001\u8a18\u8ff0\u884c\u6570\u3082\u5c11\u306a\u304f\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u305d\u3093\u306a\u30dd\u30a4\u30f3\u30bf\u306e\u57fa\u790e\u304b\u3089\u5b9f\u969b\u306e\u4f7f\u7528\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">\u76ee\u6b21<\/p><ul class=\"toc_list\"><li><a href=\"#C\">\uff11\uff0eC\u8a00\u8a9e\u306e\u30dd\u30a4\u30f3\u30bf\u3068\u306f<\/a><ul><li><a href=\"#-C\">\uff11-\uff11\uff0eC\u8a00\u8a9e\u306e\u30dd\u30a4\u30f3\u30bf\u3068\u306f<\/a><\/li><li><a href=\"#i\">\uff11-\uff12\uff0e\u30dd\u30a4\u30f3\u30bf\u306e\u8a18\u8ff0\u65b9\u6cd5<\/a><\/li><\/ul><\/li><li><a href=\"#C-2\">\uff12\uff0e\u3010C\u8a00\u8a9e\u3011\u30dd\u30a4\u30f3\u30bf\u306e\u4f7f\u3044\u65b9<\/a><ul><li><a href=\"#i-2\">\uff12-\uff11\uff0e\u30dd\u30a4\u30f3\u30bf\u3068\u914d\u5217<\/a><\/li><li><a href=\"#i-3\">\uff12-\uff12\uff0e\u30dd\u30a4\u30f3\u30bf\u3068\u69cb\u9020\u4f53<\/a><\/li><li><a href=\"#i-4\">\uff12-\uff13\uff0e\u95a2\u6570\u30dd\u30a4\u30f3\u30bf<\/a><\/li><\/ul><\/li><li><a href=\"#i-5\">\uff13\uff0e\u3055\u3044\u3054\u306b<\/a><\/li><\/ul><\/div>\n<h2><span id=\"C\"><strong>\uff11\uff0eC\u8a00\u8a9e\u306e\u30dd\u30a4\u30f3\u30bf\u3068\u306f<\/strong><\/span><\/h2>\n<h3><span id=\"-C\"><strong>\uff11-\uff11\uff0eC\u8a00\u8a9e\u306e<\/strong><strong>\u30dd\u30a4\u30f3\u30bf\u3068\u306f<\/strong><\/span><\/h3>\n<p>\u30dd\u30a4\u30f3\u30bf\u3092\u4e00\u8a00\u3067\u8868\u3059\u3068\u3001<strong><\/strong><span class=\"f-marker-y\"><strong>\u5909\u6570\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u683c\u7d0d\u3057\u3066\u3044\u308b\u5909\u6570<\/strong><\/span>\u306b\u306a\u308a\u307e\u3059\u3002\u30a2\u30c9\u30ec\u30b9\u304c\u4f55\u304b\u3068\u3044\u3046\u3068\u3001\u5909\u6570\u306e\u30e1\u30e2\u30ea\u4e0a\u306e\u4f4d\u7f6e\uff08\u756a\u5730\uff09\u306e\u3053\u3068\u3092\u610f\u5473\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u3068\u3001\u4f7f\u7528\u3059\u308b\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u306e\u30e1\u30e2\u30ea\u304c\u5909\u6570\u306e\u30b5\u30a4\u30ba\u5206\u5272\u308a\u5f53\u3066\u3089\u308c\u307e\u3059\u3002\u3053\u306e\u30e1\u30e2\u30ea\u4e0a\u306e\u4f4d\u7f6e\u3092\u8868\u3059\u8a00\u8449\u304c\u30a2\u30c9\u30ec\u30b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306b\u30a4\u30e1\u30fc\u30b8\u56f3\u3092\u8a18\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u56f3\u306b\u304a\u3051\u308b\u5909\u6570\u201da\u201d\u306e\u30dd\u30a4\u30f3\u30bf\u306f\u300110024\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/11\/b9fc90cb6683668660a48a64b42cd905.jpg\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/11\/b9fc90cb6683668660a48a64b42cd905.jpg\" alt=\"\u30dd\u30a4\u30f3\u30bf\u306b\u3064\u3044\u3066\u89e3\u8aac\uff01\" width=\"1337\" height=\"851\" class=\"alignnone size-full wp-image-981\" srcset=\"https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/11\/b9fc90cb6683668660a48a64b42cd905.jpg 1337w, https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/11\/b9fc90cb6683668660a48a64b42cd905-768x489.jpg 768w, https:\/\/www.bold.ne.jp\/engineer-club\/wp-content\/uploads\/2018\/11\/b9fc90cb6683668660a48a64b42cd905-1024x652.jpg 1024w\" sizes=\"(max-width: 1337px) 100vw, 1337px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>\u203b\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u30a2\u30c9\u30ec\u30b9\u3092\uff11\uff10\u9032\u6570\u3068\u3057\u3066\u8868\u8a18\u3057\u3066\u3044\u307e\u3059\u304c\u3001\uff11\uff16\u9032\u6570\u3067\u8868\u793a\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n<h3><span id=\"i\"><strong>\uff11-\uff12\uff0e\u30dd\u30a4\u30f3\u30bf\u306e\u8a18\u8ff0\u65b9\u6cd5<\/strong><\/span><\/h3>\n<p>\u30dd\u30a4\u30f3\u30bf\u5909\u6570\u306e\u5ba3\u8a00\u65b9\u6cd5\u306f\u3001\u5909\u6570\u540d\u306e\u5148\u982d\u306b\u300c*\u300d\uff08\u30a2\u30b9\u30bf\u30ea\u30b9\u30af\uff09\u3092\u4ed8\u3051\u308b\u3053\u3068\u3067\u3001\u5ba3\u8a00\u3057\u305f\u5909\u6570\u304c\u30dd\u30a4\u30f3\u30bf\u3067\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u901a\u5e38\u306e\u5909\u6570\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u53d6\u5f97\u3059\u308b\u5834\u5408\u306f\u3001\u5909\u6570\u540d\u306e\u5148\u982d\u306b\u300c&amp;\u300d\uff08\u30a2\u30f3\u30d1\u30b5\u30f3\u30c9\uff09\u3092\u4ed8\u3051\u307e\u3059\u3002<\/p>\n<p>\u7c21\u5358\u306a\u4f8b\u3092\u4ee5\u4e0b\u306b\u8a18\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">int  number;         \/\/ \u901a\u5e38\u306e\u5909\u6570\u306e\u5ba3\u8a00\r\nint *p_number;     \/\/ \u30dd\u30a4\u30f3\u30bf\u5909\u6570\u306e\u5ba3\u8a00\r\n\r\np_number = &amp;number;  \/\/ \u5909\u6570number\u306e\u30a2\u30c9\u30ec\u30b9\u3092p_number\u306b\u4ee3\u5165<\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001\u30dd\u30a4\u30f3\u30bf\u5909\u6570p_number\u306b\u3001\u5909\u6570number\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u4ee3\u5165\u3059\u308b\u51e6\u7406\u3068\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u5909\u6570\u306e\u578b\u3068\u3057\u3066int\u578b\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u578b\u306f\u5168\u3066\u306e\u578b\u3067\u4f7f\u7528\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u69cb\u9020\u4f53\u3092typedef\u3067\u578b\u5ba3\u8a00\u3057\u305f\u69cb\u9020\u4f53\u578b\u306b\u3082\u9069\u7528\u53ef\u80fd\u3067\u3059\u3002\u69cb\u9020\u4f53\u306e\u30dd\u30a4\u30f3\u30bf\u306b\u3064\u3044\u3066\u306f\uff12-\uff12\u7ae0\u3067\u5f8c\u8ff0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2><span id=\"C-2\"><strong>\uff12\uff0e\u3010C\u8a00\u8a9e\u3011\u30dd\u30a4\u30f3\u30bf\u306e\u4f7f\u3044\u65b9<\/strong><\/span><\/h2>\n<h3><span id=\"i-2\"><strong>\uff12-\uff11\uff0e<\/strong><strong>\u30dd\u30a4\u30f3\u30bf\u3068\u914d\u5217<\/strong><\/span><\/h3>\n<p>\u914d\u5217\u3068\u3057\u3066\u5ba3\u8a00\u3057\u305f\u5909\u6570\u3082\u30dd\u30a4\u30f3\u30bf\u3068\u3057\u3066\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u5ba3\u8a00\u65b9\u6cd5\u306f\u4ed6\u306e\u30dd\u30a4\u30f3\u30bf\u3068\u540c\u69d8\u306b\u3001\u300c*\u300d\u3092\u5148\u982d\u306b\u4ed8\u52a0\u3059\u308b\u3060\u3051\u3067\u3001\u4f7f\u7528\u3059\u308b\u969b\u3082\u5148\u982d\u306b&amp;\u3092\u4ed8\u52a0\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">char  c_str1[5];  \/\/ \u901a\u5e38\u306e\u5909\u6570\u306e\u5ba3\u8a00\r\nchar *p_str1;     \/\/ \u30dd\u30a4\u30f3\u30bf\u5909\u6570\u306e\u5ba3\u8a00\r\n\r\np_str1 = &amp;c_str1[0];  \/\/ \u5909\u6570c_str1\u306e\u30a2\u30c9\u30ec\u30b9\u3092p_str1\u306b\u4ee3\u5165<\/pre>\n<p>\u3053\u3053\u307e\u3067\u306f\u914d\u5217\u3067\u306a\u3044\u30dd\u30a4\u30f3\u30bf\u3068\u5909\u308f\u308a\u307e\u305b\u3093\u304c\u3001\u914d\u5217\u306e\u5834\u5408\u3001\u914d\u5217\u306e\u8981\u7d20\u6570\u3092\u8868\u3059\u5927\u30ab\u30c3\u30b3\uff08[n]\uff09\u3092\u7701\u7565\u3059\u308b\u3068\u30a2\u30c9\u30ec\u30b9\uff08\u3064\u307e\u308a\u914d\u5217\u5909\u6570\u306e\u30dd\u30a4\u30f3\u30bf\uff09\u3092\u6307\u3059\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3067\u3059\u306e\u3067\u3001\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u3066\u3082\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">char  c_str1[5];  \/\/ \u901a\u5e38\u306e\u5909\u6570\u306e\u5ba3\u8a00\r\nchar *p_str1;     \/\/ \u30dd\u30a4\u30f3\u30bf\u5909\u6570\u306e\u5ba3\u8a00\r\n\r\np_str1 = c_str1;  \/\/ \u5909\u6570c_str1\u306e\u30a2\u30c9\u30ec\u30b9\u3092p_str1\u306b\u4ee3\u5165<\/pre>\n<p>\u3053\u3053\u3067\u306e\u6ce8\u610f\u70b9\u306f\u3001[n]\u3092\u7701\u7565\u3057\u305f\u5834\u5408\u306f\u5fc5\u305a\u5148\u982d\u306e\u8981\u7d20\u3067\u3042\u308b\u3053\u3068\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u914d\u5217\u306en\u756a\u76ee\u3092\u6307\u5b9a\u3057\u305f\u3044\u5834\u5408\u306f\u7701\u7565\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p><strong>\u00a0<\/strong>\u307e\u305f\u3001strcpy\u3001strcmp\u7b49\u3001\u6587\u5b57\u5217\u3092\u64cd\u4f5c\u3059\u308b\u6a19\u6e96\u95a2\u6570\u3092\u76ee\u306b\u3059\u308b\u3053\u3068\u304c\u3042\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u95a2\u6570\u3067\u5f15\u6570\u306b\u4f7f\u7528\u3057\u3066\u3044\u308b\u578b\u306fchar\u578b\u306e\u30dd\u30a4\u30f3\u30bf\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">char buf1[4], buf2[4];\r\nint result;\r\n\r\nstrcpy(buf1, \u201cAAA\u201d);   \/\/ char\u578b\u306e\u914d\u5217\u5909\u6570\u306b\u3001\u300cAAA\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u4ee3\u5165\r\nstrcpy(buf2, \u201cAAB\u201d);   \/\/ char\u578b\u306e\u914d\u5217\u5909\u6570\u306b\u3001\u300cAAB\u300d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u4ee3\u5165\r\n\r\nout = strcmp(buf1, buf2);   \/\/ buf1\u3068buf2\u3092\u6bd4\u8f03\u3057\u3001\u6bd4\u8f03\u7d50\u679c\u3092out\u306b\u4ee3\u5165<\/pre>\n<h3><span id=\"i-3\"><strong>\uff12-\uff12\uff0e\u30dd\u30a4\u30f3\u30bf\u3068\u69cb\u9020\u4f53<\/strong><\/span><\/h3>\n<p>\uff11-\uff12\u7ae0\u3067\u5c11\u3057\u89e6\u308c\u307e\u3057\u305f\u304c\u3001\u69cb\u9020\u4f53\u3082\u30dd\u30a4\u30f3\u30bf\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002\u69cb\u9020\u4f53\u30dd\u30a4\u30f3\u30bf\u3068\u901a\u5e38\u306e\u69cb\u9020\u4f53\u3068\u7570\u306a\u308b\u70b9\u306f\u3001\u30e1\u30f3\u30d0\u5909\u6570\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306e\u6f14\u7b97\u5b50\u304c\u7570\u306a\u308b\u70b9\u3067\u3059\u3002<\/p>\n<p>\u901a\u5e38\u306e\u30dd\u30a4\u30f3\u30bf\u3067\u30e1\u30f3\u30d0\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5834\u5408\u306f\u3001\u300c.\u300d\uff08\u30c9\u30c3\u30c8\u6f14\u7b97\u5b50\uff09\u3092\u4f7f\u7528\u3057\u307e\u3059\u304c\u3001\u30dd\u30a4\u30f3\u30bf\u3067\u5ba3\u8a00\u3055\u308c\u305f\u69cb\u9020\u4f53\u306e\u30e1\u30f3\u30d0\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u306b\u306f\u300c-&gt;\u300d\uff08\u30a2\u30ed\u30fc\u6f14\u7b97\u5b50\uff09\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306b\u4f8b\u3092\u8a18\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">\/\/ \u69cb\u9020\u4f53\u5b9a\u7fa9\r\ntypedef struct {\r\n  int    m_num1;\r\n  int    m_num2;\r\n} struct_sample;\r\n\r\nvoid func1(struct_sample *inout)\r\n{\r\n  struct_sample * p_struct;   \/\/ \u69cb\u9020\u4f53\u578b\u306e\u30dd\u30a4\u30f3\u30bf\u306e\u5ba3\u8a00\r\n\r\n  if(inout == NULL)\r\n  {\r\n    return;\r\n  }\r\n\r\n  \/\/ \u30dd\u30a4\u30f3\u30bf\u3092\u4ee3\u5165\r\n  p_struct = (struct_sample*)inout;\r\n\r\n  if(p_struct-&gt;m_num1%10 &lt; 5) \/\/ \u30e1\u30f3\u30d0\u5909\u6570m_num1\u306810\u306e\u5270\u4f59\u304c5\u672a\u6e80\u306e\u5834\u5408\r\n  {                                                 \/\/ \u30dd\u30a4\u30f3\u30bf\u69cb\u9020\u4f53\u306e\u30e1\u30f3\u30d0\u5909\u6570\u3078\u306e\u30a2\u30af\u30bb\u30b9\u306f\u30a2\u30ed\u30fc\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\r\n    \/\/ m_num1\u30923\u500d\u3057\u305f\u6570\u3092m_num2\u306b\u4ee3\u5165\r\n    p_struct-&gt;m_num2 = p_struct-&gt;m_num1 * 3;\r\n  }\r\n}\r\n\r\nint main()\r\n{\r\n  struct_sample  strct_sample;  \/\/ \u69cb\u9020\u4f53\u306e\u5ba3\u8a00\r\n\r\n  \/\/ strct_sample\u69cb\u9020\u4f53\u30920\u3067\u521d\u671f\u5316\uff08\u5404\u30e1\u30f3\u30d0\u5909\u6570\u306b0\u3092\u4ee3\u5165\u3059\u308b\u51e6\u7406\u3068\u540c\u7b49\uff09\r\n  memset(strct_sample, 0x00, sizeof(strct_sample));\r\n\r\n  strct_sample.m_num1 = 102;  \/\/ \u69cb\u9020\u4f53\u306e\u30e1\u30f3\u30d0\u5909\u6570m_num1\u306b102\u3092\u4ee3\u5165\r\n\/\/ \u30e1\u30f3\u30d0\u5909\u6570\u306e\u30a2\u30af\u30bb\u30b9\u65b9\u6cd5\u306f\u30c9\u30c3\u30c8\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\r\n  func1(&amp;strct_sample);             \/\/ \u69cb\u9020\u4f53\u3092\u30dd\u30a4\u30f3\u30bf\u3067\u95a2\u6570\u306b\u6e21\u3059\r\n\r\n  printf(\u201cm_num1\u306e\u5024\u306f%d\u3067\u3059\\n\u201d, strct_saple.m_num1);\r\n  printf(\u201cm_num2\u306e\u5024\u306f%d\u3067\u3059\\n\u201d, strct_saple.m_num2);<\/pre>\n<h4>\u3010\u51fa\u529b\u7d50\u679c\u3011<\/h4>\n<pre class=\"prettyprint lang:default decode:true\">m_num1\u306e\u5024\u306f102\u3067\u3059\r\nm_num2\u306e\u5024\u306f306\u3067\u3059<\/pre>\n<p>\u4e0a\u8a18\u306e\u69cb\u9020\u4f53\u3092\u4f7f\u7528\u3057\u305f\u4f8b\u306f\u3001main\u3067\u5ba3\u8a00\u3057\u305f\u69cb\u9020\u4f53\u3092\u30dd\u30a4\u30f3\u30bf\u3067\u95a2\u6570func1\u306b\u6e21\u3057\u3001\u95a2\u6570\u5185\u3067\u3055\u3089\u306b\u52a0\u5de5\u3059\u308b\u3068\u3044\u3046\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u30dd\u30a4\u30f3\u30bf\u306f\u69cb\u9020\u4f53\u306e\u3042\u308b\u5834\u6240\u3092\u6307\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u53cc\u65b9\u5411\u3067\u5909\u6570\u3092\u7de8\u96c6\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h3><span id=\"i-4\"><strong>\uff12-\uff13\uff0e\u95a2\u6570\u30dd\u30a4\u30f3\u30bf<\/strong><\/span><\/h3>\n<p>\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3068\u306f\u3001\u95a2\u6570\u304c\u683c\u7d0d\u3055\u308c\u305f\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002<\/p>\n<p>\u95a2\u6570\u3082\u5909\u6570\u3068\u540c\u69d8\u306b\u30dd\u30a4\u30f3\u30bf\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u3067\u3059\u3002\u3053\u308c\u306e\u610f\u5473\u3059\u308b\u3068\u3053\u308d\u306f\u3001\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u3067\u3001\u540c\u3058\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3067\u5225\u306e\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u95a2\u6570\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u5408\u308f\u305b\u308b\u3053\u3068\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u305d\u308c\u3067\u306f\u3001\u4f7f\u3044\u65b9\u304b\u3089\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"prettyprint lang:default decode:true\">typedef double (*func)(double, double);   \/\/ \u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u306e\u578b\u5ba3\u8a00\r\n\r\n\/\/ \u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u306b\u767b\u9332\u3059\u308b\u95a2\u65701\r\nint rectangle(double num1, double num2)\r\n{\r\n  \/\/ \u5f15\u65701\u3068\u5f15\u65702\u3092\u8fba\u3068\u3057\u305f\u9577\u65b9\u5f62\u306e\u9762\u7a4d\u3092\u8fd4\u3059\r\n  return(num1 * num2);\r\n}\r\n\r\n\/\/ \u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u306b\u767b\u9332\u3059\u308b\u95a2\u65702\r\ndouble circle(double  num1, double num2)\r\n{\r\n  \/\/ \u5f15\u65701\u3092\u534a\u5f84\u3068\u3057\u305f\u5186\u306e\u9762\u7a4d\u3092\u8fd4\u3059\r\n  num1 * num1 * 3.14;\r\n}\r\n\r\nint main()\r\n{\r\n  double  num1, num2, result;\r\n  func *p_func;\r\n\r\n  num1 = 10;\r\n  num2 = 7;\r\n\r\n  p_func = &amp;rectangle;                  \/\/ \u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u306brectangle\u306e\u30dd\u30a4\u30f3\u30bf\u3092\u4ee3\u5165\r\n  result = p_func(num1, num2);\r\n  printf(\u201c\u95a2\u6570\u30dd\u30a4\u30f3\u30bfp_func()\u306e\u623b\u308a\u5024\u306f%.2f\u3067\u3059\\n\u201d, result);\r\n\r\n  p_func = &amp;circle;                         \/\/ \u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u306bcircle\u306e\u30dd\u30a4\u30f3\u30bf\u3092\u4ee3\u5165\r\n  result = p_func(num1, num2);\r\n  printf(\u201c\u95a2\u6570\u30dd\u30a4\u30f3\u30bfp_func()\u306e\u623b\u308a\u5024\u306f%.2f\u3067\u3059\\n\u201d, result);<\/pre>\n<h4>\u3010\u51fa\u529b\u7d50\u679c\u3011<\/h4>\n<pre class=\"lang:default decode:true  \">\u95a2\u6570\u30dd\u30a4\u30f3\u30bfp_func()\u306e\u623b\u308a\u5024\u306f70.00\u3067\u3059\r\n\u95a2\u6570\u30dd\u30a4\u30f3\u30bfp_func()\u306e\u623b\u308a\u5024\u306f314.00\u3067\u3059<\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u306b\u304a\u3044\u3066\u30012\u756a\u76ee\u306e\u5186\u306e\u9762\u7a4d\u3092\u6c42\u3081\u308b\u95a2\u6570\u3067\u306f\u5f15\u65702\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u305b\u3093\u304c\u3001\u554f\u984c\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u7528\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u578b\u3092\u5408\u308f\u305b\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3001\u4f7f\u7528\u3057\u306a\u3044\u5f15\u6570\u304c\u3042\u3063\u3066\u3082\u554f\u984c\u306f\u306a\u3044\u306e\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u8907\u6570\u306e\u95a2\u6570\u3092\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3067\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u4e00\u756a\u5f15\u6570\u304c\u591a\u3044\u95a2\u6570\u306b\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u7528\u3059\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2><span id=\"i-5\">\uff13\uff0e\u3055\u3044\u3054\u306b<\/span><\/h2>\n<p>\u4ee5\u4e0a\u3001C\u8a00\u8a9e\u306b\u304a\u3051\u308b\u30dd\u30a4\u30f3\u30bf\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002C\u8a00\u8a9e\u3092\u6271\u3046\u4e0a\u3067\u30dd\u30a4\u30f3\u30bf\u306f\u5fc5\u9808\u3067\u3042\u308a\u3001\u30dd\u30a4\u30f3\u30bf\u3092\u899a\u3048\u308c\u3070\u3053\u308c\u307b\u3069\u4fbf\u5229\u306a\u3082\u306e\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>C\u8a00\u8a9e\u306f\u6700\u8fd1\u306e\u9ad8\u7d1a\u8a00\u8a9e\u3067\u306f\u898b\u3048\u306a\u3044\u90e8\u5206\u3067\u3042\u308b\u30e1\u30e2\u30ea\u3068\u306e\u95a2\u9023\u6027\u306a\u3069\u304c\u5206\u304b\u308a\u3084\u3059\u3044\u8a00\u8a9e\u3067\u3042\u308a\u3001\u30dd\u30a4\u30f3\u30bf\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u305d\u306e\u4e00\u6b69\u3067\u306f\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u5c1a\u3001\u672c\u8a18\u4e8b\u5185\u3067\u4f8b\u3068\u3057\u3066\u4f7f\u7528\u3057\u305f\u30b3\u30fc\u30c9\u306f\u3042\u304f\u307e\u3067\u4f7f\u3044\u65b9\u3092\u793a\u3059\u305f\u3081\u306e\u3082\u306e\u3067\u3042\u308b\u305f\u3081\u3001\u5b9f\u52d9\u3067\u306e\u4f7f\u7528\u65b9\u6cd5\u306b\u5408\u308f\u306a\u3044\u3082\u306e\u3092\u542b\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u8a00\u8a9e\u3092\u6271\u3046\u4e0a\u3067\u3001\u30dd\u30a4\u30f3\u30bf\u306f\u907f\u3051\u3066\u901a\u308c\u306a\u3044\u90e8\u5206\u3067\u3059\u3002\u4e0a\u624b\u306b\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308c\u3070\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u5e45\u304c\u5e83\u304c\u308a\u3001\u8a18\u8ff0\u884c\u6570\u3082\u5c11\u306a\u304f\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u305d\u3093\u306a\u30dd\u30a4\u30f3\u30bf\u306e\u57fa\u790e\u304b\u3089\u5b9f\u969b\u306e\u4f7f\u7528\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002  [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":975,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"acf":[],"_links":{"self":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/972"}],"collection":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/comments?post=972"}],"version-history":[{"count":10,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/972\/revisions"}],"predecessor-version":[{"id":5702,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/posts\/972\/revisions\/5702"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media\/975"}],"wp:attachment":[{"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/media?parent=972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bold.ne.jp\/engineer-club\/wp-json\/wp\/v2\/categories?post=972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}