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  1. #include <stdio.h>
  2.  
  3. void array_mul(int (*x)[2], int (*y)[2], int (*ans)[2]) {
  4.  
  5.     for (int i = 0; i < 2; i++) {
  6.         for (int j = 0; j < 2; j++) {
  7.             ans[i][j] = 0;
  8.             for (int k = 0; k < 2; k++) {
  9.                 ans[i][j] += x[i][k] * y[k][j];
  10.             }
  11.         }
  12.     }
  13. }
  14.  
  15. int main() {
  16.     int x[2][2] = { {1, 2}, {3, 4} };
  17.     int y[2][2] = { {1, 2}, {3, 4} };
  18.     int ans[2][2];
  19.  
  20.     array_mul(x, y, ans);
  21.  
  22.     // 結果表示
  23.     printf("行列 x × y = \n");
  24.     for (int i = 0; i < 2; i++) {
  25.         for (int j = 0; j < 2; j++) {
  26.             printf("%d ", ans[i][j]);
  27.         }
  28.         printf("\n");
  29.     }
  30.  
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0s 5324KB
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stdin
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Standard input is empty
stdout
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行列 x × y = 
7 10 
15 22
https://ideone.com/euWgkM
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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