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  1.  
  2. #include <stdio.h>
  3.  
  4. void array_mul(int (*x)[2], int (*y)[2], int (*ans)[2]) {
  5.  
  6.     for (int i = 0; i < 2; i++) {      
  7.         for (int j = 0; j < 2; j++) {  
  8.             ans[i][j] = 0;
  9.  
  10.             for (int k = 0; k < 2; k++) {  
  11.                 ans[i][j] += x[i][k] * y[k][j];
  12.             }
  13.         }
  14.     }
  15. }
  16.  
  17. int main(void) {
  18.     int x[2][2] = {
  19.         {1, 2},
  20.         {3, 4}
  21.     };
  22.  
  23.     int y[2][2] = {
  24.         {1, 2},
  25.         {3, 4}
  26.     };
  27.  
  28.     int ans[2][2];
  29.  
  30.     array_mul(x, y, ans);
  31.  
  32.     printf("結果：\n");
  33.     for (int i = 0; i < 2; i++) {
  34.         for (int j = 0; j < 2; j++) {
  35.             printf("%d ", ans[i][j]);
  36.         }
  37.         printf("\n");
  38.     }
  39.  
  40.     return 0;
  41. }
Success #stdin #stdout 0s 5268KB
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stdin
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Standard input is empty
stdout
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結果：
7 10 
15 22
https://ideone.com/zd0w7P
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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