I have no clue as to what's going wrong and you only gave us a tiny code fragment so it's difficult to guess, however I wonder if this would help, or at least shed some light on what is happening.

my $bit = ($addr & $mask) ? 1 : 0;

In reply to Re: Bit fiddling madness by RichardK
in thread Bit fiddling madness by mbethke

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