#!/usr/bin/env ruby
# 99 bottles problem in Ruby

class Wall

  def initialize(num_of_bottles)
    @bottles = num_of_bottles
  end

  def sing_1_verse
    @output = sing_num(@bottles) + " on the wall, " + sing_num(@bottles) + "\n"
    @output += "take one down, pass it around, " + sing_num(@bottles-1) + "\n\n"
    r