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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.     // 2×2 行列の掛け算
  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.     // 結果表示
  18.     printf("Result matrix (ans):\n");
  19.     for (i = 0; i < 2; i++) {
  20.         for (j = 0; j < 2; j++) {
  21.             printf("%d ", ans[i][j]);
  22.         }
  23.         printf("\n");
  24.     }
  25. }
  26.  
  27. int main(void)
  28. {
  29.     int x[2][2] = {
  30.         {1, 2},
  31.         {3, 4}
  32.     };
  33.  
  34.     int y[2][2] = {
  35.         {1, 2},
  36.         {3, 4}
  37.     };
  38.  
  39.     int ans[2][2];
  40.  
  41.     array_mul(x, y, ans);
  42.  
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout 0s 5316KB
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stdin
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Standard input is empty
stdout
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Result matrix (ans):
7 10 
15 22
https://ideone.com/n58QH2
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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