http://www.perl.com/reference/query.cgi?section=tutorials
Men jeg vil klart anbefale en bog i stedet for. F.eks. Randal
Schwartz' "Learning Perl".
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$q=$h;$x=$g;for($n=0;$n<32;$n++){$a=$q*$q;$b=$x*$x;if($a+$b>4)break;
$x=2*$q*$x+$g;$q=$a-$b+$h;$n++;}echo chr(64-$n);}echo"<br>";}?>