Program for swap two values in C++

#include<iostream.h>
#include<conio.h>
void main()
{
     int a, b,c;
     clrscr();
     cout<<"Enter first value";
     cin>>a;

     cout<<"Enter second value";
     cin>>b;
     c=a;
     a=b;
     b=c;
     cout<<"first value is: "<<a<<"Second value: "<<b;
     getch();
}