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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.             for(int k=0; k<2; k++){
  9.                 ans[i][j]+=x[i][k]*y[k][j];
  10.             }
  11.         }
  12.     }
  13. }
  14.  
  15. int main(void){
  16.     int x[2][2]={{1,2},{3,4}};
  17.  
  18.     int y[2][2]={{1,2},{3,4}};
  19.  
  20.     int ans[2][2];
  21.  
  22.     array_mul(x, y, ans);
  23.  
  24.     printf("行列積の結果：\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");
  30.     }
  31.  
  32.     return 0;
  33. }
  34.  
Success #stdin #stdout 0.01s 5316KB
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stdin
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Standard input is empty
stdout
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行列積の結果：
7 10 
15 22
https://ideone.com/lzXgPv
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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