My first Ruby.rb

######################################################
#          Copyright (c) 2006 Matthew Ford           #
#   This software is licenced under the CC-GNU GPL   #
#    http://creativecommons.org/licenses/GPL/2.0/    #
######################################################

class ColoursAlt

  pcolours = ["red","blue","green"]
  
  while true #infinite loop
  puts "Please enter two primary colours (red, blue or green). To quit press return."
  print "First colour: "; STDOUT.flush; 
  colourA=gets.chop
  break if colourA.empty? #exit loop
  print "Second colour: "; STDOUT.flush;
  colourB=gets.chop
  break if colourB.empty? #exit loop
  
  colourA = colourA.downcase #make lowercase
  colourB = colourB.downcase
  
  if pcolours.member?(colourA) & pcolours.member?(colourB)
    
    if colourA == colourB
      puts "#{colourA} and #{colourB} = #{colourA}."
    end
    
    colourmix = colourA + "," + colourB
    
    case colourmix
      when /red,blue|blue,red/
        puts "#{colourA} and #{colourB} = magenta."
      when /red,green|green,red/
        puts "#{colourA} and #{colourB} = yellow."
      when /blue,green|green,blue/
        puts "#{colourA} and #{colourB} = cyan."
    end
  end

  end #end loop
end