fork download
copy 
  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.  
  38.  
  39.  return 0;
  40.  }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
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/jOVOqs
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!