Either I'm missing something... or there's a little something missing here (like assigning a value to @array):

C:\>1071258.pl 3

Argument "" isn't numeric in numeric ge (>=) at 1071258.pl line 8, <ST
+DIN> line 1.
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where line 8 in my code reflects inclusion of hashbang, etc... and contains while ($inputNumber>=1) and is Ln 4 in OP.

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Update: The node at http://www.perlmonks.com/index.pl?node_id=1071258, the parent of this post, has disappeared (been deleted? by Q&AEditors?) as of approx 0700 Eastern US, 20 Jan 2014, and this reply node contains no link to OP (nor does morgon's similar reply). So, for the record, the OP contained what follows, minus the hashbang, pragmas and source-identifying comment:

#!/usr/local/bin/perl
use 5.016; use warnings; 
# 1071258  (Q&A: convert between decimal and binary)

chomp (my $inputNumber = <STDIN>);
my @array;

while ($inputNumber>=1) 
{
    my $remainder;
    my $quo;

    if ($inputNumber == 1) 
    {
        unshift @array,$inputNumber;
        last;
    }

    $remainder = $inputNumber % 2;
    print "Remainder = $remainder\n";
    $quo = $inputNumber / 2;
    print "Quo = $quo\n";

    unshift @array,$remainder;
    $inputNumber = $quo;
}
print"\n";
print @array;
print"\n";
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