write a program to swap two numbers without using third variable

Two numbers are taken from user and then swapped without using a third variable.

Select To use this code as it is.. select and copy paste this code into code.cpp file :)

1. #include<iostream.h>
2. #include<conio.h>
   
3. void main()
   
4. {
   
5. clrscr();
   
6. int a,b;
   
7. cout<<"Enter a: ";
   
8. cin>>a;
   
9. cout<<"Enter b: ";
   
10. cin>>b;
    
11. //Coding by: Snehil Khanor
12. //http://WapCPP.blogspot.com
13. cout<<"Before swapping:"<<endl;
    
14. cout<<"a: "<<a<<" b: "<<b<<endl;
    
15. a=a+b;
    
16. b=a-b;
    
17. a=a-b;
    
18. cout<<"After swapping:"<<endl;
    
19. cout<<"a: "<<a<<" b: "<<b;
    
20. getch();
    
21. }