The follow program declares a pointer then again a new pointer to hold address of previous pointer variable.. How much can I use nested pointer variable to hold memory address is there any limit?
#include <stdio.h>
#include <conio.h>
void main()
{
int x=2,y=5;
int *ptr;
int **sptr;
int ***ssptr;
ptr = &x; // address of x
*ptr = 0;
sptr = &ptr;
ssptr = & sptr;
printf(" address is ip = %u %u %u",ptr,sptr,ssptr);
_getch();
}
There is no limit. A pointer is a chunk of memory (typically one word) whose contents are an address. A pointer to a pointer is also a word whose contents are an address, but it just so happens that the contents at that address is another address. There is nothing particularly special about a pointer to a pointer (to a pointer to a pointer... etc., ad nauseum).