#!/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;
}


##</code><code>##

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


##</code><code>##

($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,