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Re: Remove letters from variables used in math operation?

by tobyink (Abbot)
on Dec 08, 2012 at 21:17 UTC ( #1007929=note: print w/ replies, xml ) Need Help??


in reply to Remove letters from variables used in math operation?

Easy peasy!

use warnings; while ($line = <DATA>){ chop($line); ($a,$b,$c,$d,$e,$f,$g)=split(",",$line); no warnings qw(numeric); $sum = ($a+$b+$c+$d+$e+$f+$g); print $sum; } __END__ 86f,934e,92,102i,14,19,222,

The numeric warning is not compulsory; it's not even enabled by default (hence you needing to explicitly type use warnings). If it's not helping you, then turn it off.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'


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Re^2: Remove letters from variables used in math operation?
by eyepopslikeamosquito (Canon) on Dec 08, 2012 at 22:08 UTC

    While switching off warnings is OK when you are sure of the format of your data, be aware of subtle pitfalls. In particular, scientific notation. For example:

    '934e' + 1; # value is 935 '934e0' + 1; # ok, value is still 935 '934e3' + 1; # oops, value is 934001 (scientific notation)

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