Actionscript:

//

// swap some variables

// all techniques except the first are from http://cpptruths.blogspot.com/2006/04/swappingtwointegersinoneliner.html

//

var a:Number = 1.1;

var b:Number= 2.2;


trace(a, b);


// best, fastest, easiest to read way

var t:Number= a;

a = b;

b = t;


trace(a, b);


// not recommended slower ways:


b=a+b(a=b);


trace(a, b);


// xor versions will only work with ints and uints

trace("\nxor kills decimals:");


// easy to understand xor version

a^=b;

b^=a;

a^=b;


trace(a, b);


// one line xor version


a=(b=(a=b^a)^b)^a;


trace(a, b);


/* outputs:

1.1 2.2

2.2 1.1

1.1 2.2


xor kills decimals:

2 1

1 2

*/
The above swaps variables a and b in a few different ways. The first way (using a temp variable) is the best and fastest way... the rest of the ways are just interesting and fun.
I was coding and something reminded me that there are obscure variable swapping techniques out there... so I figured I'd google for a bit.... there are tons of examples of these online  with lots of good explanations.... I got the above from this link.