Swapping Program Without function

/* Program to SWAP two variable without using THIRD variable in C++ (without function) */ 

/*In this program will will not use third variable to swap the the variable but we will be using the operator to do so*/

//Header file

#include<iostream.h>

int main()

{

int a,b;

cout<<"\n Enter First No:- ";

cin>>a;

cout<<"\n Enter Second No:- ";

cin>>b;

cout<<"\n Value before swaping. a= "<<a<<" b="<<b;

a=a+b;

b=a-b;

a=a-b;

cout<<"\n Value after swaping. a= "<<a<<" b="<<b;

return 0;

}