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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     // 宣言と同時に初期化する方法
  5.     int int_arr1[5] = {0, 1, 2, 3, 4};
  6.  
  7.     // 全ての要素をゼロで初期化する方法
  8.     int int_arr2[5] = {};
  9.     for(int i = 0; i < 5; i++) {
  10.         if(i < 4) {
  11.             printf("%d,", int_arr2[i]);
  12.         } else {
  13.             printf("%d\n", int_arr2[i]);
  14.         }
  15.     }
  16.  
  17.     // 途中まで初期化
  18.     int int_arr3[5] = {0, 1, 2};
  19.     for(int i = 0; i < 5; i++) {
  20.         if(i < 4) {
  21.             printf("%d,", int_arr3[i]);
  22.         } else {
  23.             printf("%d\n", int_arr3[i]);
  24.         }
  25.     }
  26.  
  27.     // ひとつの要素だけゼロ以外を指定
  28.     int int_arr4[5] = {[2] = 2};
  29.     for(int i = 0; i < 5; i++) {
  30.         if(i < 4) {
  31.             printf("%d,", int_arr4[i]);
  32.         } else {
  33.             printf("%d\n", int_arr4[i]);
  34.         }
  35.     }
  36.  
  37.     // 要素数の記述を省略
  38.     char char_arr1[] = {'H', 'e', 'l', 'l', 'o'};
  39.     printf("%s\n", char_arr1);
  40.  
  41.     // 文字列で初期化
  42.     char char_arr2[16] = "Hello";
  43.  
  44.     return 0;
  45. }
Success #stdin #stdout 0s 5516KB
comments (?)
stdin
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Standard input is empty
stdout
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0,0,0,0,0
0,1,2,0,0
0,0,2,0,0
Hello
https://ideone.com/uCQmqh
language:
C (gcc 8.3)
created:
1 year ago
visibility:
public

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