Well, Perl doesn't have any keywords for TRUE and FALSE.

Since TRUE and FALSE are barewords in your code, I assume that they are subroutine calls.

Otherwise, they would be caught with use strict (which everyone uses, right?). That is (remembering that use constant defines subroutines), 

use constant FALSE => 0;
use constant TRUE => !FALSE;

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Assuming that they return 1 and 0 (or 0 and 1, it doesn't matter), then this would work:

Just use the xor operator:

my $debug = FALSE; # or 0
$debug ^= 1; # now it's TRUE, or 1
$debug ^= 1; # now it's FALSE, or 0

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or use this:

$debug = !$debug; # change 1 to 0 or 0 to 1

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update: added !, explanation/assumption at top.

In reply to Re: Flip Flop IV by bikeNomad
in thread Flip Flop IV by PetaMem

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