Swap the variables!!

Hello Folks,
There are two variables suppose int x=10,y=20.I want to swap the variables without using a temporary variable.How can we do that?Please help me out.
Regards,
Ravi

Welcome to boolean logic 101.
x = x^y;
y = x^y;
x = x^y;
Nothing could be simpler

.
Joe
P.S. Back in the olden days, we actually had to do this kind of stuff to save registers and avoid costly memory accesses. Honest!

Oh, and if you really want to be sick about it, try this:
x ^= y ^= x ^= y;
Joe

Joe, you could slide those into the SCJP forum sometime

For those of us who aren't really familiar with those forums, Barry, what exactly is the purpose of the SCJP forum, for example? How would I "slip this into" the forum? Just a question that might stimulate a little more participation from those of us who currently don't spend time in the certification forums.
Joe

Not as cool as Joe's, but as a colleague of mine pointed out, this also works:
x = x + y
y = x - y
x = x - y

Hi all
How about floats instead of int. Try this.