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  1. #include <stdio.h>
  2.  
  3. void array_mul(int (*x)[2], int (*y)[2], int (*ans)[2]) {
  4.  
  5.     int i, j, k;
  6.  
  7.     // 行列積: ans = x * y
  8.     for (i = 0; i < 2; i++) {
  9.         for (j = 0; j < 2; j++) {
  10.             ans[i][j] = 0;  // 初期化
  11.             for (k = 0; k < 2; k++) {
  12.                 ans[i][j] += x[i][k] * y[k][j];
  13.             }
  14.         }
  15.     }
  16.  
  17.     // 結果を表示
  18.     for (i = 0; i < 2; i++) {
  19.         for (j = 0; j < 2; j++) {
  20.             printf("%d ", ans[i][j]);
  21.         }
  22.         printf("\n");
  23.     }
  24. }
  25.  
  26. int main(void) {
  27.     int a[2][2] = {
  28.         {1, 2},
  29.         {3, 4}
  30.     };
  31.     int b[2][2] = {
  32.         {1, 2},
  33.         {3, 4}
  34.     };
  35.     int ans[2][2];
  36.  
  37.     array_mul(a, b, ans);
  38.     return 0;
  39. }
  40.  
  41.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/aug3C0
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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