54. Swap Two Pointers Using Double Pointers

#include <stdio.h>
void change(int *a, int b) {
    *a = b;
}

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

    change(&(**p1), **p2);
    change(&(**p2), temp);
}

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;
}