program to exchange 2 variables without using 3rd variables...

INPUT=

#include<iostream>
using namespace std;

int main()
{
int a,b;
cout<<"\nEnter two numbers : ";
cin>>a>>b;
a=a+b;
b=a-b;
a=a-b;
cout<<"\nAfter swapping numbers are : ";
cout<<a<<" "<<b;


return 0;
}


OUTPUT=
Enter two numbers : 78 12
After swapping numbers are : 12 78