hq9+.rb

@accumulator = 0
@beer = ''; 97.times do |n|
  @beer << "
#{99-n} bottles of beer on the wall,
#{99-n} bottles of beer.
Take one down and pass it around,
#{98-n} bottles of beer on the wall.
"
end; @beer << "
2 bottles of beer on the wall,
2 bottles of beer.
Take one down and pass it around,
1 bottle of beer on the wall.

1 bottle of beer on the wall,
1 bottle of beer.
Take one down and pass it around,
No more bottles of beer on the wall.

No more bottles of beer on the wall,
No more bottles of beer.
Go to the store and buy some more,
99 bottles of beer on the wall.
"

def run code
  code.scan(/[hq9+]/i).each do |operator|
    case operator
      when /h/i then puts "Hello, World!"
      when /q/i then print code
      when '9'  then print @beer
      when '+'  then @accumulator += 1
    end
  end
end