Challenge: Algorithms having only one line of code.

[na_th_an]

In the spirit of the originally stated "to turn a switch on and off", would the very often used following line qualify?

Code:

IF A = 1 THEN A = 0 ELSE A = 1

Yeah, that works Ralph, but we have been considering as algorithms that code which does not have any IF's. That is, strictly computational, either arithmetic or logical.
*****

Code:

A = 1 - A

Yeah, Nathan, that's very good. But we should always define that this algorithm will flip a switch which is either 0 or 1. BTW I forgot to mention this in the examples of the original rules of the thread.

NOTE: Speaking of those examples, the following code is incorrect for flipping a 0 or 1 switch called sw:
sw = sw xor sw
It should be:
sw = sw xor 1

I'm surprised nobody caught that.
*****

Sure, that's what it does. Flip 0 to 1, 1 to 0... It was just an oneliner for the multiline IF version.