./dog2.rb:20:in `initialize': wrong number of arguments (0 for 1) (ArgumentError)
	from ./dog2.rb:20:in `new'
	from ./dog2.rb:20

# cat dog2.rb

#!/usr/bin/ruby -w

class Dog
 def initialize(meters)
   @size = meters
 end

 def grow(meters)
   @size += meters
 end

 def speak
  if @size <  0.2 then "yep"
  elsif @size < 1 then "woof"
  else "ROOOOOOAAARRRR!"
  end
 end
end

d = Dog.new