Swap Two Pointers Using Double Pointers

Code

#include <stdio.h>


void swap_pointers(int **p1, int **p2) {
    int *tmp = *p1;   // save the pointer that p1 points to
    *p1 = *p2;        // p1 now points to what p2 pointed to
    *p2 = tmp;        // p2 now points to the 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