Swap Two Pointers Using Double Pointers

Code

#include <stdio.h>

#include <stdio.h>

void swap_pointers(int **p1, int **p2) {
    // Your logic here
    
 	int *temp = *p1; // address of "p1" either &p1 or *p1 || value **p1
 	*p1 = *p2; // address of "p2" either &p2 or *p2  
 	*p2 = temp; // since single pointer is used need to pass 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

 

 

 

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Input

10 20

Expected Output

20 10