problem 2

#include<stdio.h>

int swap(int *,int *);
int main()
{

    int n1,n2;
    printf("\n\n Function : swap two numbers using function :\n");
    printf("------------------------------------------------\n");
    printf("Input 1st number : ");
    scanf("%d",&n1);
    printf("Input 2nd number : ");
    scanf("%d",&n2);

    printf("Before swapping: n1 = %d, n2 = %d ",n1,n2);

    swap(&n1,&n2);
    printf("\nAfter swapping: n1 = %d, n2 = %d \n\n",n1,n2);
}
    int swap(int *p,int *q)
{
    int tmp;
    tmp = *p;
    *p=*q;
    *q=tmp;
    return swap;
}