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Creating Reports with hashes: Use of uninitialized value while adding integers

by GertMT (Hermit)
on Jan 26, 2012 at 15:09 UTC ( [id://950114]=perlquestion: print w/replies, xml ) Need Help??

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  1. or download this
    my $quant = $tree_collection{$years}{$trees}{$size} || 0;
  2. or download this
    || 0
  3. or download this
     $year_total += $total;
  4. or download this
    #!/usr/bin/perl -w
use strict;
...
2008,Basswood,25,9
2011,Pine,11,5

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