First you should use strict and use warnings. That would tell you that you missed parens in this declaration: 
    my (@less, @equal, @greater, @answer);

[download]

It would also inform you that you misspelled @equal in: 

    unshift(@answer, @equal); # was @equals

[download]
Fixing those two problems and adding a print statement at the end yields: 
My pivot is 5
My pivot is 3
My pivot is 6
answer: 9 6 5 4 3 1

[download]

Btw, I don't know why you feel you have to use (shift @copy) in your pushes. You can achieve the same thing with the much simpler: 

  if ($_ < $pivot) {
    push(@less, $_);
  }
  if ($_ == $pivot) {
    push(@equal, $_);
  }
  # etc...

[download]

In reply to Re: Quicksort trubbles. by pc88mxer
in thread Quicksort trubbles. by pobocks

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.