Swapping using two variables in C++

#include<iostream.h>
#include<conio.h>
void main()
{
int a,b;
clrscr();


cout<<"\n\nEnter the two no=:";
cin>>a>>b;
cout<<"\na"<<a<<"\nb"<<b;


a=a+b;
b=a-b;
a=a-b;


cout<<"\n\na="<<a<<"\nb="<<b;
getch();
}








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