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C++ program to swap the values of four variables without using fifth variable

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#include<iostream.h>
#include<conio.h>
int a, b, c, d;
void main(){
clrscr();
cout<<"Enter four numbers:"<<endl;
cin>>a>>b>>c>>d;
a=a+b+c+d;
b=a-b-c-d;
c=a-b-c-d;
d=a-b-c-d;
a=a-b-c-d;
cout<<"Before swapping the values:- "<<endl<<"A:"<<a<<endl<<"B:"<<b<<endl<<"C:"<<c<<endl<<"D:"<<d<<endl<<"After swapping the values:-"<<endl<<"A:"<<a<<endl<<"B:"<<b<<endl<<"C:"<<c<<endl<<"D:"<<d;
getch();
}

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