This is just a warning, not an error. You could always use the ||= operator to force an empty string to 0 

use warnings;

my $numb = ''; 
print $numb + 5; # issues warning

$numb ||= 0;
print $numb +5; # no warning

[download]
It is a minor nuisance, but it is a nice warning to know about it, as it might lead to unexpected results down the road.

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to Re: "" isn't numeric... by jeffa
in thread "" isn't numeric... by moltar512

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