Question

I know about these. Is there any other ways as well? And which one is better?

1. Using temporary Variables
2. Using some Arithmetic operation
3. Using bitwise XOR operation

I believe the best approach is the XOR implementation. Any suggestions?

Answer 1

Anything that doesnt use temporary variable/register is guaranteed not to work always. Hence NOT advised to use it.

Bitwise XOR swap doesnt work on same variable.(http://en.wikipedia.org/wiki/XOR_swap_algorithm#Reasons_for_avoidance_in_practice)

‘Arithmetics without temp variable swap’ will have overflow issues.

Also note that if you do a simple swap using temporary, compiler is smart enough to convert it to assembly without using temp variable. If you try to over-smart it, then

1. Your code will end equal or slower AND
2. Your code will be less readable for sure.