Program Exchange Values Without Third Variable

#include<iostream.h>
#include<conio.h>
void main()
{
     int v1, v2;

     cout<<"Enter value of first variable:";
     cin>>v1;
  
     cout<<"Enter value of second variable:";
     cin>>v2;

     cout<<"The values before swapping are: \n Varible 1="<<v1<<" Variable 2="<<v2;
     v2 = v1+v2;
     v1 = v2-v1;
     v2 = v2-v1;

     cout<<"\n The values after swapping are: \n Varible 1="<<v1<<" Variable 2="<<v2;  
     
      getch();

     }