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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. void
  5. pp(int *a, int r, int c, const char *msg)
  6. {
  7.   int             i, j;
  8.   printf("%s\n", msg);
  9.   for (i = 0; i < r; ++i) {
  10.     for (j = 0; j < c; ++j) {
  11.       printf("%4d", *a++);
  12.     }
  13.     puts("");
  14.   }
  15.   puts("");
  16. }
  17.  
  18. int
  19. main()
  20. {
  21.   int             a[][2] = {
  22.     {1, 2},
  23.     {3, 4},
  24.     {5, 6}
  25.   };
  26.   int             b[][3] = {
  27.     {1, 2, 4},
  28.     {3, 6, 9}
  29.   };
  30.  
  31.   int             row = sizeof(a) / sizeof(a[0]);
  32.   int             col = sizeof(a[0]) / sizeof(int);
  33.   int            *c = (int *) malloc(sizeof(int) * row * row);
  34.   int             i;
  35.  
  36.   for (i = 0; i < row * row; ++i) {
  37.     int             w1 = i / row * col, w2 = i % row;
  38.     c[i] = *(*a + w1) * *(*b + w2);
  39.     w1 += 1;
  40.     w2 += row;
  41.     c[i] += *(*a + w1) * *(*b + w2);
  42.   }
  43.  
  44.   pp(*a, 3, 2, "行列xを表示");
  45.   pp(*b, 2, 3, "行列yを表示");
  46.   pp(c, 3, 3, "行列xとyの積を表示");
  47.  
  48.   return 0;
  49. }
Success #stdin #stdout 0.02s 1808KB
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stdin
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Standard input is empty
stdout
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行列xを表示
   1   2
   3   4
   5   6

行列yを表示
   1   2   4
   3   6   9

行列xとyの積を表示
   7  14  22
  15  30  48
  23  46  74
https://ideone.com/XWipv5
language:
C (gcc 8.3)
created:
12 years ago
visibility:
secret

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