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  1. #include <stdio.h>
  2.  
  3. void array_mul(int (*x)[2], int (*y)[2], int (*ans)[2]) {
  4.     int i, j, k;
  5.  
  6.     for (i = 0; i < 2; i++) {
  7.         for (j = 0; j < 2; j++) {
  8.             ans[i][j] = 0;
  9.             for (k = 0; k < 2; k++) {
  10.                 ans[i][j] += x[i][k] * y[k][j];
  11.             }
  12.         }
  13.     }
  14. }
  15.  
  16. int main(void) {
  17.     int x[2][2] = {
  18.         {1, 2},
  19.         {3, 4}
  20.     };
  21.  
  22.     int y[2][2] = {
  23.         {1, 2},
  24.         {3, 4}
  25.     };
  26.  
  27.     int ans[2][2];
  28.  
  29.     array_mul(x, y, ans);
  30.  
  31.     for (int i = 0; i < 2; i++) {
  32.         for (int j = 0; j < 2; j++) {
  33.             printf("%d ", ans[i][j]);
  34.         }
  35.         printf("\n");
  36.     }
  37.  
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0s 5308KB
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https://ideone.com/ZXwPJF
language:
C (gcc 8.3)
created:
14 hours ago
visibility:
public

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