Hi, some remarks:
- use "use strict"
- initialize your data before using it ($l is not initialized)
- you don't need rows, row1, row2 as temporary variables

The following script checks for an empty line with the
mighty regexp /^[\s]+$/ instead of
comparing with "". 

#!/usr/local/bin/perl -w

use strict;

my (@names, @versions,$l,$e);

$l=0;
$e=0;
while (<DATA>) {
  chomp;
  if (! /^[\s]+$/) {
    ($names[$l],$versions[$l])=split(/[\s]+/);  
    $l++;
  }
  else {
    $e++;
  }
}

$,=", ";
print "@names @versions\n";
print "empty lines=$e\n";

__DATA__

jan 2.76
feb 3.20

mar 1.6
apr 4.00

[download]

In reply to Re: How to find empty in empty by Monky Python
in thread How to find empty in empty by Anonymous Monk

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.