Pointer- Swap Value

Code

#include <stdio.h>

void swap(int *p1, int *p2) 
{
    int tmp = *p1;
    *p1 = *p2;
    *p2 = tmp;
}

int main() 
{
    int a, b;
    if (scanf("%d %d", &a, &b) != 2) 
    {
        fprintf(stderr, "Invalid input\n");
        return 1;
    }

    swap(&a, &b);

    printf("a = %d ", a);
    printf("b = %d\n", b);

    return 0;
}

Solving Approach