use strict;
my $i = 2;

my @dna = split //, 'CTCCGGATCTAT';
my $counter = 0;
my $total = 0;

while ($i < @dna)     {
   if ($dna[$i] eq 'C')    {
          $counter++;
    }
   elsif ($dna[$i] eq 'G')   {
          $counter++;
   }
   $total++;
   $i += 3;
 }
print "Found $counter G/C of $total elements at a 3-position\n";

##</code><code>##

perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ;    # The  
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new   #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' #  web