Instance variable scope within a subclass in Ruby... super works to instantiate the subclasses properly but not the factory methods from the Temperature class!

testfirst_08.rb

# The subclasses really aren't pretty... I had major issues with 
# getting the subclasses access to the instance variables @c and 
# @f so they could run the in_celsius and in_fahrenheit methods.

class Temperature

  def initialize t
		@f = t[:f]
		@c = t[:c]
		#puts "initialized!!! t = #{t.inspect}, @f is #{@f.inspect} and @c is #{@c.inspect}"
	end

	def in_celsius
		@c ? @c : ( @f - 32 ) * 5.0 / 9.0
	end

	def in_fahrenheit
		@f ? @f : @c * 9.0 / 5.0 + 32
	end

	def self.from_celsius c
		Temperature.new(:c => c)
	end

	def self.from_fahrenheit f
		Temperature.new(:f => f)
	end

end


class Celsius < Temperature

	def initialize t
		super(:c=>t)
	end

end


class Fahrenheit < Temperature

	def initialize t
		Temperature::from_fahrenheit(t)
		# at this point, @c and @f are both back to being nil!
		@f = t
	end

end