Swap Two Pointers Using Double Pointers

Code

#include <stdio.h>

void swap_pointers(int **p1, int **p2)
{
    int *temp;

    temp = *p1;   // store address held by p1
    *p1  = *p2;   // p1 now points where p2 was pointing
    *p2  = temp;  // p2 now points to original p1 target
}


int main() {
    int a, b;
    scanf("%d %d", &a, &b);

    int *p1 = &a;
    int *p2 = &b;

    swap_pointers(&p1, &p2);

    printf("%d %d", *p1, *p2);

    return 0;
}

Solving Approach