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Re: I need help with the error "Modification of non-creatable array value attempted"

by Bethany (Scribe)
on Jul 14, 2014 at 16:51 UTC ( #1093584=note: print w/replies, xml ) Need Help??

in reply to I need help with the error "Modification of non-creatable array value attempted"

Using arithmetic division as a substitute for bit manipulation can create unexpected results. Since what you're doing here is shifting bits, why not treat $number like the binary it is? Use the shift right operator >> instead of dividing by two.

(edited to add) Likewise, rather than using arithmetic modulo to to the equivalent of extracting the low bit, just use the bitwise and operator & to do a real bit mask operation. $number & 1 always gives the low bit of an integer $number, $number & 2 the next least significant bit, and so forth.

If personally coding a solution for that specific chore isn't important, see the concise, ready-to-use solutions in this question and answer. I've found that nineteen times out of twenty, consulting Perl Monks Super Search and Google (which often sends me to Perl Monks) brings up a solution ready to drop in as is or use with a little adaptation.

Hope this helps!

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