Pointer to Pointer in C Programming

Example : Demonstrating pointers to pointers

#include <stdio.h>
void main ()
{
    int  v;
    int  *p;
    int  **pt;
    v = 5000;

    /* take the address of variable */
    p = &v;

    /* take the address of pointer using address of operator & */
    pt = &p;

    /* take the value using pptr */
    printf("Value of variable = %d\n", v );
    printf("Value available at '*p' = %d\n", *p );
    printf("Value available at '**pt' = %d\n", **pt);
}