Learn to Program, 2nd Edition

Exercises from Chapter 7

“99 Bottles of Beer on the Wall”

How you could do it:

num_at_start = 5  #  change to 99 if you want
num_now = num_at_start
while num_now > 2
  puts num_now.to_s + ' bottles of beer on the wall, ' +
       num_now.to_s + ' bottles of beer!'
  num_now = num_now - 1
  puts 'Take one down, pass it around, ' +
       num_now.to_s + ' bottles of beer on the wall!'
end
puts "2 bottles of beer on the wall, 2 bottles of beer!"
puts "Take one down, pass it around, 1 bottle of beer on the wall!"
puts "1 bottle of beer on the wall, 1 bottle of beer!"
puts "Take one down, pass it around, no more bottles of beer on the wall!"

5 bottles of beer on the wall, 5 bottles of beer!
Take one down, pass it around, 4 bottles of beer on the wall!
4 bottles ...