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  1. #include <stdio.h>
  2.  
  3. void array_mul(int (*x)[2], int (*y)[2], int (*ans)[2]) {
  4.     for (int i = 0; i < 2; i++) {         // 行ループ
  5.         for (int j = 0; j < 2; j++) {     // 列ループ
  6.             ans[i][j] = 0;
  7.             for (int k = 0; k < 2; k++) { // 積の計算
  8.                 ans[i][j] += x[i][k] * y[k][j];
  9.             }
  10.         }
  11.     }
  12.  
  13.     // 結果表示
  14.     for (int i = 0; i < 2; i++) {
  15.         for (int j = 0; j < 2; j++) {
  16.             printf("%d ", ans[i][j]);
  17.         }
  18.         printf("\n");
  19.     }
  20. }
  21.  
  22. int main(void) {
  23.     int x[2][2] = {
  24.         {1, 2},
  25.         {3, 4}
  26.     };
  27.  
  28.     int y[2][2] = {
  29.         {1, 2},
  30.         {3, 4}
  31.     };
  32.  
  33.     int ans[2][2];  // 結果格納用
  34.  
  35.     array_mul(x, y, ans);
  36.  
  37.     return 0;
  38. }
  39.  
  40.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
stdout
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7 10 
15 22
https://ideone.com/5owDkH
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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