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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 を計算 */
  8.     for (i = 0; i < 2; i++) {
  9.         for (j = 0; j < 2; j++) {
  10.             ans[i][j] = 0;
  11.             for (k = 0; k < 2; k++) {
  12.                 ans[i][j] += x[i][k] * y[k][j];
  13.             }
  14.         }
  15.     }
  16. }
  17.  
  18. int main(void)
  19. {
  20.     int x[2][2] = {
  21.         {1, 2},
  22.         {3, 4}
  23.     };
  24.  
  25.     int y[2][2] = {
  26.         {1, 2},
  27.         {3, 4}
  28.     };
  29.  
  30.     int ans[2][2];
  31.  
  32.     array_mul(x, y, ans);
  33.  
  34.     /* 結果表示 */
  35.     for (int i = 0; i < 2; i++) {
  36.         for (int j = 0; j < 2; j++) {
  37.             printf("ans[%d][%d] = %d\n", i, j, ans[i][j]);
  38.         }
  39.     }
  40.  
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout 0.01s 5312KB
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stdin
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Standard input is empty
stdout
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ans[0][0] = 7
ans[0][1] = 10
ans[1][0] = 15
ans[1][1] = 22
https://ideone.com/0Bvupk
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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