Here's something that might work: 
#factorial through recursion
use strict;
use warnings;
print "enter number\n";
my $num=<>;
my $fac = &fact($num,1);
print "factorial: $fac\n";
##################
sub fact
{
   my($num1,$flag)=@_;
   if($num1==0) {
     return $flag;
#     print "$flag" and die "brrrrrrrreeeeeee :D\n";
    }
   else
     {fact($num1-1,$num1*$flag);}
}

[download]
It's good (better/best) to use return statement in recursive code!
Also, instead of shift, use @_
Raghu

In reply to Re: factorial through recursion by imrags
in thread factorial through recursion by hnd

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.