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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.  
  9.             for (int 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.     printf("結果：\n");
  32.     for (int i = 0; i < 2; i++) {
  33.         for (int j = 0; j < 2; j++) {
  34.             printf("%d ", ans[i][j]);
  35.         }
  36.         printf("\n");
  37.     }
  38.  
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 5288KB
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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/6YnxLl
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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