Program for swapping (without using third variable)

#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int a,b;

cout<<"ENTER VALUE FOR a=";

cin>>a;

cout<<"ENTER VALUE FOR b=";

cin>>b;

a=a+b;

b=a-b;

a=a-b;

cout<<"-----------AFTER THE SWAPPING-----------\n a="<<a<<" b="<<b;

getch();

}