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  1. #include <stdio.h>
  2.  
  3. #define N 2
  4.  
  5.  
  6. void array_mul(int (*x_ptr)[N], int (*y_ptr)[N], int (*ans_ptr)[N]) {
  7.  
  8.     for (int i = 0; i < N; i++) { 
  9.         for (int j = 0; j < N; j++) { 
  10.             ans_ptr[i][j] = 0; 
  11.  
  12.             for (int k = 0; k < N; k++) { 
  13.                 ans_ptr[i][j] += x_ptr[i][k] * y_ptr[k][j];
  14.             }
  15.         }
  16.     }
  17. }
  18.  
  19. int main(void) {
  20.     // 2次元配列 x と y の定義 (2x2行列)
  21.     int x[N][N] = {
  22.         {1, 2},
  23.         {3, 4}
  24.     };
  25.  
  26.     int y[N][N] = {
  27.         {1, 2},
  28.         {3, 4}
  29.     };
  30.  
  31.     int ans[N][N];
  32.  
  33.  
  34.     array_mul(x, y, ans);
  35.  
  36.     printf("---行列 x と y の積の結果 ---\n");
  37.     for (int i = 0; i < N; i++) {
  38.         for (int j = 0; j < N; j++) {
  39.             printf("%4d", ans[i][j]);
  40.         }
  41.         printf("\n"); 
  42.     }
  43.  
  44.     return 0;
  45. }
Success #stdin #stdout 0s 5320KB
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Standard input is empty
stdout
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---行列 x と y の積の結果 ---
   7  10
  15  22
https://ideone.com/ATwuO8
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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