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WAP to swap two numbers without using the third variable in C++ ?

 

Swap two numbers without using the third variable in c++ ?

#include<iostream.h>
#include<conio.h>
void main()
{
int a,b;
clrscr();
//read the two numbers 
cout<<endl<<"Enter the value of a and b :";
cin>>a>>b;
//swap the values 
cout<<endl<<"Before Swap , a= " <<a<<" b= " <<b;
a=a+b;
b=a-b;
a=a-b;
cout<<endl<<"After Swap , a="<<a<<" b= "<<b;
getch();
}


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