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  1. #include <stdio.h>
  2.  
  3.  
  4. #define SIZE 2
  5.  
  6.  
  7. void array_mul( int (*x)[SIZE], int (*y)[SIZE], int (*ans)[SIZE] ) {
  8.     int i, j, k;
  9.     int sum;
  10.  
  11.    for (i = 0; i < SIZE; i++) { 
  12.         for (j = 0; j < SIZE; j++) { 
  13.             sum = 0;
  14.             for (k = 0; k < SIZE; k++) { 
  15.                 sum += x[i][k] * y[k][j];
  16.             }
  17.             ans[i][j] = sum;
  18.         }
  19.     }
  20. }
  21.  
  22.  
  23. void print_matrix( const char *name, int (*matrix)[SIZE] ) {
  24.     int i, j;
  25.     for (i = 0; i < SIZE; i++) {
  26.         for (j = 0; j < SIZE; j++) {
  27.             printf("%4d", matrix[i][j]);
  28.         }
  29.         printf("\n");
  30.     }
  31. }
  32.  
  33. int main(void) {
  34.  
  35.     int x[SIZE][SIZE] = {
  36.         {1, 2},
  37.         {3, 4}
  38.     };
  39.  
  40.     int y[SIZE][SIZE] = {
  41.         {1, 2},
  42.         {3, 4}
  43.     };
  44.  
  45.  
  46.     int ans[SIZE][SIZE];
  47.  
  48.      array_mul(x, y, ans);
  49.  
  50.      print_matrix("行列 ans", ans);
  51.  
  52.     return 0;
  53. }
Success #stdin #stdout 0s 5324KB
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https://ideone.com/wvosQP
language:
C99 (gcc 8.3)
created:
2 days ago
visibility:
public

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