Re: This is why logic is so frustrating (was This is why Perl is so frustrating)

If you wish to verify that "x" is neither one of two possibilities, then you have to verify that "x" is not "." and "x" is not "..".

so ... what you want is

if (($file ne ".") and ($file ne "..")) { ...
[download]

Best, beth

Comment on Re: This is why logic is so frustrating (was This is why Perl is so frustrating) Download Code

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Re^2: This is why logic is so frustrating (was This is why Perl is so frustrating) by eggmatters (Initiate) on Jul 29, 2009 at 18:17 UTC
Yes, I remember this all from school and my c programming days. True or False is always true unelss the bit flips due to cosmic background radiation or the butterfly effect: http://xkcd.com/378/	[reply]
Re^3: This is why logic is so frustrating (was This is why Perl is so frustrating) by SuicideJunkie (Vicar) on Jul 29, 2009 at 20:16 UTC
Another annoying possibility is interrupts/concurrency. I once had a case where `if ($x && !$x) {...}` [download] was evaluating to true, two or three times per hour.	[reply] [d/l]