{"id":655,"date":"2023-07-19T07:58:22","date_gmt":"2022-09-12T16:32:42","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/c%e3%81%ab%e3%81%8a%e3%81%84%e3%81%a6%e3%80%81%e9%85%8d%e5%88%97%e3%81%ae%e9%95%b7%e3%81%95%e3%82%92%e8%aa%bf%e3%81%b9%e3%82%8b%e6%96%b9%e6%b3%95%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f\/"},"modified":"2025-08-01T01:25:00","modified_gmt":"2025-07-31T16:25:00","slug":"c%e3%81%ab%e3%81%8a%e3%81%84%e3%81%a6%e3%80%81%e9%85%8d%e5%88%97%e3%81%ae%e9%95%b7%e3%81%95%e3%82%92%e8%aa%bf%e3%81%b9%e3%82%8b%e6%96%b9%e6%b3%95%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%ab%e3%81%8a%e3%81%84%e3%81%a6%e3%80%81%e9%85%8d%e5%88%97%e3%81%ae%e9%95%b7%e3%81%95%e3%82%92%e8%aa%bf%e3%81%b9%e3%82%8b%e6%96%b9%e6%b3%95%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f\/","title":{"rendered":"C++\u306b\u304a\u3044\u3066\u3001\u914d\u5217\u306e\u9577\u3055\u3092\u8abf\u3079\u308b\u65b9\u6cd5\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002"},"content":{"rendered":"

\u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3<\/h2>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001C++\u3067\u914d\u5217\u306e\u9577\u3055\u3092\u6c42\u3081\u308b\u305f\u3081\u306e\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3059\u3002<\/p>\n

\u57fa\u672c\u7684\u306b\u3001\u914d\u5217\u306e\u9577\u3055\u3068\u3044\u3046\u306e\u306f\u3001\u5bfe\u5fdc\u3059\u308b\u914d\u5217\u306b\u5b9f\u969b\u306b\u5b58\u5728\u3059\u308b\u8981\u7d20\u306e\u7dcf\u6570\u3092\u6307\u3059\u3068\u8a00\u3048\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306b\u793a\u3059\u3088\u3046\u306a\u914d\u5217\u306e\u5834\u5408\u3001\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n

int<\/span> array1[<\/span>]<\/span> =<\/span> {<\/span> 0<\/span>,<\/span> 1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span> }<\/span>\r\n<\/code><\/pre>\n
\u3053\u3053\u3067\u306f\u3001\u914d\u5217\u306e\u30b5\u30a4\u30ba\u307e\u305f\u306f\u914d\u5217\u306e\u9577\u3055\u306f\u3001\u305d\u306e\u4e2d\u306e\u8981\u7d20\u306e\u7dcf\u6570\u3068\u7b49\u3057\u3044\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u305d\u306e\u6570\u306f\u300e\uff15\u300f\u3067\u3059\u3002<\/p>\n
C++\u3067\u914d\u5217\u306e\u9577\u3055\u3092\u898b\u3064\u3051\u308b\u65b9\u6cd5<\/h2>\n
\u4eca\u304b\u3089\u306f\u3001C++\u3067\u914d\u5217\u306e\u9577\u3055\u3092\u6c42\u3081\u308b\u305f\u3081\u306e\u7570\u306a\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u305d\u308c\u3089\u306e\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
    \n
  1. \n
      \u8981\u7d20\u3054\u3068\u306b\u6570\u3048\u308b\u3068\u3001<\/ol>\n<\/li>\n<\/ol>\n
       <\/p>\n
        \n
      1. \n
          begin() \u3068 end()\u3001<\/ol>\n<\/li>\n<\/ol>\n
           <\/p>\n
            \n
          1. \n
              sizeof() \u95a2\u6570\u3001<\/ol>\n<\/li>\n<\/ol>\n
               <\/p>\n
                \n
              1. \n
                  STL \u306e size() \u95a2\u6570\u3001<\/ol>\n<\/li>\n<\/ol>\n
                   <\/p>\n
                    \u30dd\u30a4\u30f3\u30bf\u30fc\u3002<\/ol>\n
                    \u4eca\u3001\u79c1\u305f\u3061\u306f\u4f8b\u3068\u8a73\u7d30\u3092\u4f7f\u3063\u3066\u3001\u5404\u65b9\u6cd5\u3092\u4e00\u3064\u4e00\u3064\u8a71\u3057\u5408\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n
                    1. \u8981\u7d20\u3092\u4e00\u3064\u4e00\u3064\u6570\u3048\u308b<\/h3>\n
                    \u4e0e\u3048\u3089\u308c\u305f\u914d\u5217\u3092\u30c8\u30e9\u30d0\u30fc\u30b9\u3057\u306a\u304c\u3089\u3001\u540c\u6642\u306b\u8d70\u67fb\u3057\u305f\u8981\u7d20\u306e\u7dcf\u6570\u3092\u6570\u3048\u308b\u3053\u3068\u3067\u3001\u914d\u5217\u306e\u9577\u3055\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u306d\u3002<\/p>\n
                    \u3057\u304b\u3057\u3001\u914d\u5217\u306e\u9577\u3055\u3092\u4e8b\u524d\u306b\u77e5\u3089\u306a\u3044\u5834\u5408\u3001\u76f4\u63a5for\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u3066\u30c8\u30e9\u30d0\u30fc\u30b9\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3053\u306e\u554f\u984c\u306f\u3001\u30b7\u30f3\u30d7\u30eb\u306afor-each\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u89e3\u6c7a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u6ce8\u610f\u6df1\u304f\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
                    #<\/span>include<\/span><iostream><\/span>    <\/span>\r\n#<\/span>include<\/span><array><\/span> <\/span>\r\nusing<\/span> namespace<\/span> std;<\/span>\r\nint<\/span> main<\/span>(<\/span>)<\/span>\r\n{<\/span>\r\n   int<\/span> c;<\/span>\r\n   int<\/span> arr[<\/span>]<\/span>=<\/span>{<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>,<\/span>6<\/span>,<\/span>7<\/span>,<\/span>8<\/span>,<\/span>9<\/span>,<\/span>0<\/span>}<\/span>;<\/span>\r\n   cout<<<\/span>\"The array is: \"<\/span>;<\/span>\r\n   for<\/span>(<\/span>auto<\/span> i:<\/span> arr)<\/span>\r\n   {<\/span>\r\n   \t\tcout<<<\/span>i<<<\/span>\" \"<\/span>;<\/span>\r\n   \t\tc++<\/span>;<\/span>\r\n   }<\/span>\r\n   cout<<<\/span>\"\\nThe length of the given Array is: \"<\/span><<<\/span>c;<\/span>\r\n   \r\n   return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \u51fa\u529b\uff1a<\/p>\n
                    The array is:<\/span> 1<\/span> 2<\/span> 3<\/span> 4<\/span> 5<\/span> 6<\/span> 7<\/span> 8<\/span> 9<\/span> 0<\/span>\r\nThe length of the given Array is:<\/span> 10<\/span>\r\n<\/code><\/pre>\n
                    \u3053\u3053\u3067\u306f\u3001\u524d\u3082\u3063\u3066\u8a00\u3063\u305f\u3088\u3046\u306b\u3001\u30a4\u30c6\u30ec\u30fc\u30bfi\u3092\u4f7f\u3063\u3066for-each\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217arr\u5168\u4f53\u3092\u8d70\u67fb\u3057\u307e\u3059\u3002\u540c\u6642\u306b\u3001\u30ab\u30a6\u30f3\u30bf\u30fcc\u3082\u5897\u5206\u3055\u308c\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001\u8d70\u67fb\u304c\u7d42\u308f\u3063\u305f\u3068\u304d\u306b\u3001c\u306b\u306f\u4e0e\u3048\u3089\u308c\u305f\u914d\u5217\u306e\u9577\u3055\u304c\u683c\u7d0d\u3055\u308c\u307e\u3059\u3002<\/p>\n
                    \uff12. begin()\u3068end()\u3092\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n
                    \u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306ebegin()\u3068end()\u95a2\u6570\u3092\u4f7f\u3063\u3066\u3001\u914d\u5217\u306e\u9577\u3055\u3082\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u95a2\u6570\u306f\u3001\u305d\u308c\u305e\u308c\u5bfe\u5fdc\u3059\u308b\u914d\u5217\u306e\u5148\u982d\u3068\u672b\u5c3e\u3092\u6307\u3059\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u8fd4\u3057\u307e\u3059\u3002\u4e0e\u3048\u3089\u308c\u305f\u30b3\u30fc\u30c9\u3092\u3088\u304f\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
                    #<\/span>include<\/span><iostream><\/span>    <\/span>\r\n#<\/span>include<\/span><array><\/span> <\/span>\r\nusing<\/span> namespace<\/span> std;<\/span>\r\nint<\/span> main<\/span>(<\/span>)<\/span>\r\n{<\/span>  \r\n   \/\/Given Array<\/span>\r\n   int<\/span> arr[<\/span>]<\/span> =<\/span> {<\/span> 11<\/span>,<\/span> 22<\/span>,<\/span> 33<\/span>,<\/span> 44<\/span> }<\/span>;<\/span>\r\n   \r\n   cout<<<\/span>\"The Length of the Array is : \"<\/span><<<\/span>end<\/span>(<\/span>arr)<\/span>-<\/span>begin<\/span>(<\/span>arr)<\/span>;<\/span> \/\/length<\/span>\r\n   \r\n   return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \u51fa\u529b\u901f\u5ea6:<\/p>\n
                    The Length of the Array is :<\/span> 4<\/span>\r\n<\/code><\/pre>\n
                    \u3057\u305f\u304c\u3063\u3066\u3001\u3053\u3053\u3067\u79c1\u305f\u3061\u304c\u898b\u308b\u3088\u3046\u306b\u3001\u95a2\u6570end()\u3068begin()\u306e\u623b\u308a\u5024\u306e\u9055\u3044\u306f\u3001\u4e0e\u3048\u3089\u308c\u305f\u914d\u5217arr\u306e\u30b5\u30a4\u30ba\u307e\u305f\u306f\u9577\u3055\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u79c1\u305f\u3061\u306e\u5834\u5408\u306f4\u3067\u3059\u3002<\/p>\n
                    C++\u306b\u304a\u3044\u3066\u3001\u914d\u5217\u306e\u9577\u3055\u3092sizeof()\u95a2\u6570\u3092\u4f7f\u3063\u3066\u6c42\u3081\u308b\u3002<\/h3>\n
                    C++\u306esizeof()\u6f14\u7b97\u5b50\u306f\u3001\u6e21\u3055\u308c\u305f\u5909\u6570\u3084\u30c7\u30fc\u30bf\u306e\u30b5\u30a4\u30ba\u3092\u30d0\u30a4\u30c8\u5358\u4f4d\u3067\u8fd4\u3057\u307e\u3059\u3002\u540c\u69d8\u306b\u3001\u914d\u5217\u3092\u683c\u7d0d\u3059\u308b\u306e\u306b\u5fc5\u8981\u306a\u7dcf\u30d0\u30a4\u30c8\u6570\u3082\u8fd4\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5358\u7d14\u306b\u914d\u5217\u306e\u30b5\u30a4\u30ba\u3092\u8981\u7d20\u3054\u3068\u306b\u53d6\u5f97\u3057\u305f\u30b5\u30a4\u30ba\u3067\u5272\u308b\u3068\u3001\u914d\u5217\u306b\u542b\u307e\u308c\u308b\u8981\u7d20\u306e\u7dcf\u6570\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n
                    \u79c1\u305f\u3061\u306b\u305d\u308c\u304c\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u304b\u3092\u793a\u3057\u3066\u304f\u3060\u3055\u3044\u3002 (Watashitachi ni sore ga dono y\u014d ni kin\u014d suru ka o shimeshite kudasai.)<\/p>\n
                    #<\/span>include<\/span><iostream><\/span>    <\/span>\r\n#<\/span>include<\/span><array><\/span> <\/span>\r\nusing<\/span> namespace<\/span> std;<\/span>\r\nint<\/span> main<\/span>(<\/span>)<\/span>\r\n{<\/span>  \/\/Given array<\/span>\r\n   int<\/span>  arr[<\/span>]<\/span> =<\/span> {<\/span>10<\/span> ,<\/span>20<\/span> ,<\/span>30<\/span>}<\/span>;<\/span>\r\n   \r\n   int<\/span> al =<\/span> sizeof<\/span>(<\/span>arr)<\/span>\/<\/span>sizeof<\/span>(<\/span>arr[<\/span>0<\/span>]<\/span>)<\/span>;<\/span> \/\/length calculation<\/span>\r\n   cout <<<\/span> \"The length of the array is: \"<\/span> <<<\/span>al;<\/span>\r\n   \r\n   return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \u51fa\u529b\uff1a<\/p>\n
                    The length of the array is:<\/span> 3<\/span>\r\n<\/code><\/pre>\n
                    \u79c1\u305f\u3061\u304c\u898b\u308b\u3088\u3046\u306b\u3001\u79c1\u305f\u3061\u306f\u671b\u3093\u3060\u51fa\u529b\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
                    4. STL\u306esize()\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3002<\/h3>\n
                    \u300c\u79c1\u305f\u3061\u306f\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u5b9a\u7fa9\u3055\u308c\u305fsize()\u95a2\u6570\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u95a2\u6570\u306f\u3001\u4e0e\u3048\u3089\u308c\u305f\u30b3\u30f3\u30c6\u30ca\uff08\u6211\u3005\u306e\u5834\u5408\u306f\u914d\u5217\uff09\u5185\u306e\u8981\u7d20\u306e\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002\u300d<\/p>\n
                    #<\/span>include<\/span><iostream><\/span>    <\/span>\r\n#<\/span>include<\/span><array><\/span> <\/span>\r\nusing<\/span> namespace<\/span> std;<\/span>\r\nint<\/span> main<\/span>(<\/span>)<\/span>\r\n{<\/span>  \/\/Given array<\/span>\r\n   array<<\/span>int<\/span>,<\/span>5<\/span>><\/span> arr{<\/span> 1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span> }<\/span>;<\/span>\r\n   \/\/Using the size() function from STL<\/span>\r\n   cout<<<\/span>\"\\nThe length of the given Array is: \"<\/span><<<\/span>arr.<\/span>size<\/span>(<\/span>)<\/span>;<\/span>\r\n   return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \u300c\u7d50\u679c\uff1a\u300d<\/p>\n
                    The length of the given Array is:<\/span> 5<\/span>\r\n<\/code><\/pre>\n
                    \u671b\u307e\u308c\u308b\u901a\u308a\u3001\u4e0a\u8a18\u306e\u3088\u3046\u306a\u51fa\u529b\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
                    5. C++\u306b\u304a\u3044\u3066\u3001\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217\u306e\u9577\u3055\u3092\u6c42\u3081\u308b<\/h3>\n
                    \u4e0e\u3048\u3089\u308c\u305f\u914d\u5217\u306e\u9577\u3055\u306f\u3001\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u7528\u3057\u3066\u3082\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3069\u306e\u3088\u3046\u306b\u898b\u3064\u3051\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
                    #<\/span>include<\/span><iostream><\/span>    <\/span>\r\n#<\/span>include<\/span><array><\/span> <\/span>\r\nusing<\/span> namespace<\/span> std;<\/span>\r\nint<\/span> main<\/span>(<\/span>)<\/span>\r\n{<\/span>  \/\/Given array<\/span>\r\n   int<\/span>  arr[<\/span>6<\/span>]<\/span> =<\/span> {<\/span>5<\/span>,<\/span>4<\/span>,<\/span>3<\/span>,<\/span>2<\/span>,<\/span>1<\/span>,<\/span>0<\/span>}<\/span>;<\/span>\r\n   \r\n   int<\/span> len =<\/span> *<\/span>(<\/span>&<\/span>arr +<\/span> 1<\/span>)<\/span> -<\/span> arr;<\/span>\r\n   \/\/*(&arr + 1) is the address of the next memory location<\/span>\r\n   \/\/ just after the last element of the array<\/span>\r\n   \r\n   cout <<<\/span> \"The length of the array is: \"<\/span> <<<\/span> len;<\/span>\r\n   \r\n   return<\/span> 0<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \u51fa\u529b\uff1a<\/p>\n
                    The length of the array is:<\/span> 6<\/span>\r\n<\/code><\/pre>\n
                    \u5f0f\uff08arr+1\uff09\u306f\u3001\u914d\u5217\u306e\u6700\u5f8c\u306e\u8981\u7d20\u306e\u3059\u3050\u5f8c\u308d\u306e\u30e1\u30e2\u30ea\u7a7a\u9593\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u4e0e\u3048\u3066\u304f\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u305d\u306e\u30a2\u30c9\u30ec\u30b9\u3068\u914d\u5217\u306e\u958b\u59cb\u4f4d\u7f6e\u307e\u305f\u306f\u57fa\u672c\u30a2\u30c9\u30ec\u30b9\uff08arr\uff09\u3068\u306e\u5dee\u306f\u3001\u4e0e\u3048\u3089\u308c\u305f\u914d\u5217\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u8981\u7d20\u306e\u5408\u8a08\u6570\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n
                    \u7d50\u8ad6<\/h2>\n
                    \u3060\u304b\u3089\u3001\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001C++\u3067\u914d\u5217\u306e\u9577\u3055\u3092\u898b\u3064\u3051\u308b\u305f\u3081\u306e\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8b70\u8ad6\u3057\u307e\u3057\u305f\u3002\u4e0a\u8a18\u306e\u4f8b\u306e\u305d\u308c\u305e\u308c\u306f\u7c21\u5358\u306b\u5b9f\u884c\u3067\u304d\u307e\u3059\u304c\u3001\u79c1\u305f\u3061\u306ffor-each\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3092\u63a8\u5968\u3057\u307e\u3059\u3002\u30b3\u30fc\u30c9\u306e\u8aad\u307f\u3084\u3059\u3055\u3060\u3051\u3067\u306a\u304f\u3001\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306e\u4fe1\u983c\u6027\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n
                    \u8ffd\u52a0\u306e\u8cea\u554f\u304c\u3042\u308a\u307e\u3057\u305f\u3089\u3001\u304a\u6c17\u8efd\u306b\u4ee5\u4e0b\u306e\u30b3\u30e1\u30f3\u30c8\u6b04\u3092\u3054\u5229\u7528\u304f\u3060\u3055\u3044\u3002<\/p>\n
                    \u53c2\u8003\u6587\u732e<\/h2>\n
                      \n
                    • How do I find the length of an array? – Stack Overflow question,<\/li>\n
                    • for-each loop in C++ – JournalDev post.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
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