#!/usr/bin/ruby
#
@song= ""
@ss = ""

def sing_for(bottles)
  if (bottles > 1)
	then  @ss = "s"
  end
  # 
  @song.<<("#{bottles}"+" bottle"+ @ss + " of beer on the wall. ")
  @song.<<("#{bottles}"+" bottle"+ @ss + " of beer. ")
  @song.<<("Take one down, pass it around. ")
  @song.<<("#{bottles}"+" bottle"+@ss+" of beer on the wall.")
  @song
end

[3, 2, 1].each do |beer| 
  p sing_for(beer)
end