Pointer to Pointer example

#include <stdio.h>


int main()
{
    // In this code we'll see how a pointer to pointer works

    int* pk = NULL, ** q = NULL;    // initialize as NULL

    int k = 123;                    // initialize k as 123
    int m = 999;                    // initialize m as 999

    pk = &k;                        // ptr pk will store address of variable k
    q = &pk;                        // ptr q will store address of ptr pk

    //**q = 121;                        // q stores address of ptr pk that stores address of var k and set it as 121
                                    // so k = 123 is now k = 121

    *q = &m;

    printf("%d", pk);

    return 0;
}