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  1. #include <stdio.h>
  2.  
  3. void array_mul(const int (*x)[2], const int (*y)[2], int (*ans)[2]);
  4.  
  5. int main(void)
  6. {
  7.     int x[2][2] = { {1, 2},
  8.                     {3, 4} };
  9.  
  10.     int y[2][2] = { {1, 2},
  11.                     {3, 4} };
  12.  
  13.     int ans[2][2] = {0};
  14.  
  15.     array_mul(x, y, ans);
  16.  
  17.     printf("multiplication\n");
  18.     for (int i = 0; i < 2; i++) {
  19.         for (int j = 0; j < 2; j++) {
  20.             printf("%d ", ans[i][j]);
  21.         }
  22.         putchar('\n');
  23.     }
  24.  
  25.     return 0;
  26. }
  27.  
  28. void array_mul(const int (*x)[2], const int (*y)[2], int (*ans)[2])
  29. {
  30.     for (int i = 0; i < 2; i++) {
  31.         for (int j = 0; j < 2; j++) {
  32.             ans[i][j] = 0;
  33.             for (int k = 0; k < 2; k++) {
  34.                 ans[i][j] += x[i][k] * y[k][j];
  35.             }
  36.         }
  37.     }
  38. }
Success #stdin #stdout 0.01s 5320KB
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stdin
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Standard input is empty
stdout
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multiplication
7 10 
15 22
https://ideone.com/MK9aSZ
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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