54. Swap Two Pointers Using Double Pointers

#include <stdio.h>

void swap_pointers(int **p1, int **p2) {
    // Your logic here
    int *add = *p1;
    // printf("p1=%x p2=%x add=%x **p1=%d **p2=%d \n",*p1,*p2,add,**p1,**p2);
    *p1 = *p2;
    // printf("p1=%x p2=%x add=%x **p1=%d **p2=%d \n",*p1,*p2,add,**p1,**p2);
    *p2 = add;
    // printf("p1=%x p2=%x add=%x **p1=%d **p2=%d \n",*p1,*p2,add,**p1,**p2);
}

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

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

    // printf("p1=%x p2=%x \n", p1, p2);

    swap_pointers(&p1, &p2);

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

    return 0;
}