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  1. #include <stdio.h>
  2. void array_mul(int (*x)[2], int (*y)[2], int (*ans)[2]) {
  3.     int i, j, k;
  4.  
  5.     for (i = 0; i < 2; i++) {
  6.         for (j = 0; j < 2; j++) {
  7.             ans[i][j] = 0; 
  8.             for (k = 0; k < 2; k++) {
  9.  
  10.                 ans[i][j] += x[i][k] * y[k][j];
  11.             }
  12.         }
  13.     }
  14. }
  15.  
  16. int main() {
  17.  
  18.     int x[2][2] = {{1, 2}, {3, 4}};
  19.     int y[2][2] = {{1, 2}, {3, 4}};
  20.     int ans[2][2]; // 結果格納用
  21.  
  22.     array_mul(x, y, ans);
  23.  
  24.     printf("計算結果:\n");
  25.     for (int i = 0; i < 2; i++) {
  26.         for (int j = 0; j < 2; j++) {
  27.             printf("%d ", ans[i][j]);
  28.         }
  29.         printf("\n"); // 行の区切りで改行
  30.     }
  31.  
  32.     return 0;
  33. }
Success #stdin #stdout 0s 5308KB
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stdin
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Standard input is empty
stdout
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計算結果:
7 10 
15 22
https://ideone.com/rdXwQ4
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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