Scary trick ( swaping without declaring third variable )

1. Initialize two integers a and b with the values of your desire
2. a=a+b;
3. b=a-b;
4. a=a-b;
5. 2nd, 3rd and 4th steps will swap the values of a and b. value of a will be shifted to b and value of b will be shifted to a. Enjoy it.