#include<iostream.h>
#include<stdio.h>
int s(int &x,int &y)
{
   x=x+y;
   y=x-y;
   x=x-y;
   return 1; 
}

void main()
{
   int a,b;
    a=4;
    b=6;
   printf("Before Swap:a=%d,b=%d\n",a,b);
    s(a,b);
   printf("After  Swap:a=%d,b=%d\n",a,b);
}