GrandFather nailed it, so this isn't an answer to your question, but a comment on 

$out = sprintf("@tmp");

[download]

It's wrong. Using sprintf will cause any % to be interpreted specially. 

local $" = '';  # Don't insert spaces.
$out = "@tmp";  # sprintf not needed at all.

[download]

A better solution would be: 

$out = join('', @tmp);

[download]

I've also noticed you've been putting your comments in <code>/<c> tags. Please don't do that. Only put code (and other pre-formatted data) in <code>/<c> tags. If the problem is that you don't know HTML, pretty much all you need to know is to put <p> at the start of every paragraph.

In reply to Re: What is the best solution to swap input data? by ikegami
in thread What is the best solution to swap input data? by bh_perl

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.