gistfile1.rb

# Student: Thomas-0725;
# Status: Complete;

class Temperature
  #Temperature is stored in @temperature_celsius and then convereted to other systems as needed.
  private

  def ftoc(fahrenheit)
    celsius = ((fahrenheit - 32.0) * 5.0) / 9.0
  end

  def ctof(celsius)
    fahrenheit = (celsius * 9.0) / 5.0 + 32.0
  end

  public
  #Takes options c: temp or f: temp. :c option is given precedence.
  def initialize(options)

    @temperature_celsius = Float(options[:c]) rescue ftoc(Float(options[:f])) rescue nil
    
=begin #OLD
    case true
    when options[:c].is_a?(Numeric)
      @temperature_celsius = options[:c].to_f
    when options[:f].is_a?(Numeric)
      @temperature_celsius = ftoc(options[:f])
    else
      @temperature_celsius = nil
    end
=end
  end

  #Returns temperature of object, in Fahrenheit.
  def in_fahrenheit
    ctof(@temperature_celsius)
  end

  #Returns temperature of object, in Celsius.
  def in_celsius
    @temperature_celsius
  end

  #Returns a new Temperature object created from a Celsius temperature.
  def Temperature.from_celsius(celsius)
    Temperature.new(:c => celsius)
  end

  #Returns a new Temperature object created from a Fahrenheit temperature.
  def Temperature.from_fahrenheit(fahrenheit)
    Temperature.new(:f => fahrenheit)
  end

end

class Celsius < Temperature
  def initialize(degrees_celsius)
    @temperature_celsius = degrees_celsius
  end
end

class Fahrenheit < Temperature
  def initialize(degrees_fahrenheit)
    @temperature_celsius = ftoc(degrees_fahrenheit)
  end
end