指针和数组的千丝万缕（二）

#include <stdio.h>

int main(void)
{
   int a[][3] = {1, 2, 3, 4, 5, 6};
   int (*ptr)[3] = a;

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

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

   return 0;
}

Here, a has type array[2] of array[3] of int, and ptr initially points to the first array[3] ({1, 2, 3}).  After the increment, it points to the second array[3] ({4, 5, 6}).  Of course,*ptr denotes the array[3] that ptr happens to point to.

int (*ptr)[3]; 声明了一个指针， 指向了一个有3个int元素的数组。

那么打印出来就是

2 3 5 6