Explain me what is happening

Please explain me what is happening

Code:

---

main()
{
  int a[][3] = { 1,2,3 ,4,5,6};
  int (*ptr)[3] =a;            //Is address of 'a' being assigned to (*ptr)[0] or (*ptr)[3]?

  printf("%d %d "  ,(*ptr)[1], (*ptr)[2] );

  ++ptr;
  printf("%d %d"  ,(*ptr)[1], (*ptr)[2] );
}

---

Its creating a pointer to the 2 dimensional array a, then printing out some of the content. Basically showing a different way to refer to arrays.


EG: a[0][1] == (*ptr)[1] before the pointer gets incremented.

int (*ptr)[3]
Is just the pointer syntax to a 2D array with 3 columns, so you're just creating a pointer to the array.
On a side note, main returns int and typically returns 0 at the end.