Swap Two Pointers Using Double Pointers

Code

#include <stdio.h>

void swap_pointers(int **p1, int **p2) {
    // Your logic here
    int *temp = *p1;
    *p1 = *p2;
    *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;
}

Solving Approach

• swap two pointers using double pointer

  1.Store *p1 in a temporary pointer: temp = *p1

  2.Assign *p1 = *p2

  3.Assign *p2 = temp