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  1. #include <stdio.h>
  2.  
  3. void array_mul(int (*x)[2], int (*y)[2], int (*ans)[2]) {
  4.  
  5.     // 行列の掛け算（2×2）
  6.     for (int i = 0; i < 2; i++) {          // x の行
  7.         for (int j = 0; j < 2; j++) {      // y の列
  8.             ans[i][j] = 0;
  9.             for (int k = 0; k < 2; k++) {  // 掛け算の和
  10.                 ans[i][j] += x[i][k] * y[k][j];
  11.             }
  12.         }
  13.     }
  14.  
  15.     // 結果表示
  16.     printf("ans =\n");
  17.     for (int i = 0; i < 2; i++) {
  18.         for (int j = 0; j < 2; j++) {
  19.             printf("%d ", ans[i][j]);
  20.         }
  21.         printf("\n");
  22.     }
  23. }
  24.  
  25. int main() {
  26.     int x[2][2] = {
  27.         {1, 2},
  28.         {3, 4}
  29.     };
  30.  
  31.     int y[2][2] = {
  32.         {1, 2},
  33.         {3, 4}
  34.     };
  35.  
  36.     int ans[2][2];
  37.  
  38.     array_mul(x, y, ans);
  39.  
  40.     return 0;
  41. }
  42.  
  43.  
Success #stdin #stdout 0s 5324KB
comments (?)
stdin 
Standard input is empty
stdout 
ans =
7 10 
15 22
https://ideone.com/zF1aqr
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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