The problem is in the algorithm. Assuming that a<b: 

#!/usr/bin/perl -w
use strict;

my $str = $ARGV[0]||"123-135, 111-119, 127-130, 140-145";
#borrowed from ikegami
print "Original string \n" . $str;
print "\nEnding string \n";
print show($_) for map { [ split(/-/, $_) ] } split(/\s*,\s*/, $str);

sub show {
    my (@anums) = split //,$$_[0];
    my (@bnums) = split //,$$_[1];
    my ($output) = $$_[0] . '-';
    my $switch = 0;
    if ($#anums != $#bnums){
        return $$_[0];
    }
    for(0..$#bnums){
    if(defined($anums[$_])){
          #if same, do nothing
      #if larger, include
        if (($bnums[$_] > $anums[$_])|| ($switch)){
        $output .= $bnums[$_];
                $switch++;
            }
        } 
    }
    return $output . ' ';
}

[download]

Celebrate Intellectual Diversity

In reply to Re: Problem in Number Range by InfiniteSilence
in thread Problem in Number Range by Samy_rio

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.