note fatmac That was interesting, especially as they also were reading the same book when they coded it. This is my single gear calculator code: <code>#!/usr/bin/perl use strict; use warnings; print "\nGear Calculator\n\n"; print "Enter Wheelsize (inches): "; my $wheel = <>; print "Enter Chainwheel Teeth: "; my $teeth = <>; print "Enter Cog Teeth: "; my $cog = <>; my $gear = $wheel * $teeth / $cog; print "\nYour gear is: ", $gear, "\n\n";</code> 991577 991668