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    <p><a href="http://search.cpan.org/perldoc/Math%3a%3aCounting">Math::Counting</a> looks a little silly (I mean <em>student</em> versus <em>engineering</em> modes?) The <em>real</em> factorial function provided by the module, <code>bfact</code> is a thin wrapper around <code>Math::BigInt::bfac</code>. So, just use <a href="http://search.cpan.org/perldoc/Math%3a%3aBigInt">Math::BigInt</a>.</p> <pre><code>#!/usr/bin/env perl use strict; use warnings; use Math::BigInt(); print Math::BigInt-&gt;bfac('300'), "\n"; </code></pre> <p>Output:</p> <pre>30605751221644063603537046129726862938858880417357699941677674125947653317671686 74655152914224775733499391478887017263688642639077590031542268429279069745598412 25476930271954604008012215776252176854255965356903506788725264321896264299365204 57644883038890975394348962543605322598077652127082243763944912012867867536830571 22936819436499564604981664502277165001851765464693401122260347297240663332585835 06870150169794168850353752137554910289126407157154830282284937952636580145235233 15693648223343679925459409527682060806223281238738388081704960000000000000000000 0000000000000000000000000000000000000000000000000000000</pre> <p><em>No</em>, <a href="http://www.wolframalpha.com/input/?i=300!">I did not verify the result</a>.</p> <p>As others have noted, <code>Math::Counting</code> has:</p> <pre><code>our @ISA = qw(Exporter); our @EXPORT = qw( factorial permutation combination bfact bperm bcomb ); </code></pre> <p>but there is no <code>require</code> <a href="http://perldoc.perl.org/Exporter.html">Exporter</a>.</p> <p>In fact, there is no need for this module to <em>inherit</em> from Exporter. A simple:</p> <pre><code>use Exporter 'import'; </code></pre> <p>would have been enough. Also, there really is no need to pollute the namespace of a user of this module by default, so it should have:</p> <pre><code>our @EXPORT = (); our @EXPORT_OK = qw( factorial permutation combination bfact bperm bcomb ); </code></pre> <p>Otherwise, what's the point of defining <code>%EXPORT_TAGS</code>?</p>
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    1. CO+1 for `use Exporter 'import'` vs. `use base qw(Exporter)` or equivalent techniques. Another +1 (well, I hit the vote button repeatedly) for recommending no EXPORT by default.
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