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  1. #include <stdio.h>
  2.  
  3. int a[][3] = {{10, 20, 30},
  4.               {40, 50, 60},
  5.               {70, 80, 90}};
  6.  
  7. int main(void)
  8. {
  9.     int *p[] = {a[0], a[1], a[2]};
  10.     int (*q)[3] = a;
  11.  
  12.     printf("sizeof(int) = %zu\n", sizeof(int)); // 4
  13.     printf("sizeof(int *) = %zu\n", sizeof(int *)); // 8
  14.     printf("sizeof(int (*)[3]) = %zu\n", sizeof(int (*)[3])); // 8
  15.     printf("sizeof a = %zu\n", sizeof a);
  16.     printf("sizeof p = %zu\n", sizeof p);
  17.     printf("sizeof q = %zu\n", sizeof q);
  18.  
  19.     printf("**a = %d\n", **a);
  20.     printf("a[1][1] = %d\n", a[1][1]);
  21.     printf("*a[1] = %d\n", *a[1]);
  22.     printf("(*a + 1)[1] = %d\n", (*a + 1)[1]);
  23.     printf("*(a + 1)[1] = %d\n", *(a + 1)[1]);
  24.  
  25.     printf("**p = %d\n", **p);
  26.     printf("p[1][1] = %d\n", p[1][1]);
  27.     printf("*p[1] = %d\n", *p[1]);
  28.     printf("(*p + 1)[1] = %d\n", (*p + 1)[1]);
  29.     printf("*(p + 1)[1] = %d\n", *(p + 1)[1]);
  30.  
  31.     printf("**q = %d\n", **q);
  32.     printf("q[1][1] = %d\n", q[1][1]);
  33.     printf("*q[1] = %d\n", *q[1]);
  34.     printf("(*q + 1)[1] = %d\n", (*q + 1)[1]);
  35.     printf("*(q + 1)[1] = %d\n", *(q + 1)[1]);
  36.  
  37.     return 0;
  38. }
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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sizeof(int) = 4
sizeof(int *) = 8
sizeof(int (*)[3]) = 8
sizeof a = 36
sizeof p = 24
sizeof q = 8
**a = 10
a[1][1] = 50
*a[1] = 40
(*a + 1)[1] = 30
*(a + 1)[1] = 70
**p = 10
p[1][1] = 50
*p[1] = 40
(*p + 1)[1] = 30
*(p + 1)[1] = 70
**q = 10
q[1][1] = 50
*q[1] = 40
(*q + 1)[1] = 30
*(q + 1)[1] = 70
https://ideone.com/0UGxDS
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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