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  1. #include <stdio.h>
  2.  
  3. #define N 2
  4.  
  5. void array_mul(int (*x)[N], int (*y)[N], int (*ans)[N]) {
  6.  
  7.     for (int i = 0; i < N; i++) {
  8.         for (int j = 0; j < N; j++) { 
  9.             ans[i][j] = 0; 
  10.  
  11.             for (int k = 0; k < N; k++) { 
  12.                 ans[i][j] += x[i][k] * y[k][j];
  13.             }
  14.         }
  15.     }
  16. }
  17.  
  18. int main(void) {
  19.     int x[N][N] = {
  20.         {1, 2},
  21.         {3, 4}
  22.     };
  23.  
  24.     int y[N][N] = {
  25.         {1, 2},
  26.         {3, 4}
  27.     };
  28.  
  29.     int ans[N][N];
  30.  
  31.     array_mul(x, y, ans);
  32.  
  33.     for (int i = 0; i < N; i++) {
  34.         for (int j = 0; j < N; j++) {
  35.             printf("%4d", ans[i][j]);
  36.         }
  37.         printf("\n");
  38.     }
  39.  
  40.     return 0;
  41. }
Success #stdin #stdout 0s 5324KB
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https://ideone.com/1kak1F
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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