in reply to Perl script to calacuate percentage statistics, does not display 0% in output

Most of the code you posted is irrelevant to the question. Or even worse - it makes it almost impossible for us to find where in the code the problem happens (you haven't indicated it in a comment or otherwise).

After reading the code, it seems to me defined or length is what you need: 

#!/usr/bin/perl
use warnings;
use strict;

my @data = (100, 10, 0, undef, q());

no warnings qw( uninitialized numeric );
for my $token (@data) {
    printf "PLAIN |%d|\tDEFINED ", $token;
    printf defined $token ? "|%d|\t" : "\t", $token;
    print "LENGTH ";
    printf length $token ? "|%d|\n" : "\n", $token;
}

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Output: 

PLAIN |100|     DEFINED |100|   LENGTH |100|
PLAIN |10|      DEFINED |10|    LENGTH |10|
PLAIN |0|       DEFINED |0|     LENGTH |0|
PLAIN |0|       DEFINED         LENGTH 
PLAIN |0|       DEFINED |0|     LENGTH

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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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