From: Gunther Diemant <g.diemant@...>
Date: 2011-12-19T15:40:40+09:00
Subject: Re: "Have your program add one to the number" ?

A number will not  automaticly be converted to string. You have to do
it manually (with to_s).

Even better, use string interpolation:

puts "hmmm.... Waht about #{new_number}? It's bigger and better."