From: cyberco <cyberco@...>
Date: 2005-11-26T00:42:27+09:00
Subject: recursion

I'm trying to print every combination of three characters from the
range (a..z). I thought recursion would be the most elegant solution,
but that got me quite confused :)  Any suggestions? Here's my
(erronous) attempt:

________________________

def addChar(str, level)
    ('a'..'z').each {|c|
        if level == 2
            puts str + c
        else
            str += c
            addChar(str, level + 1)
        end
    }
end

addChar("", 0)