ISP_01.rb

class Rectangle
  attr_accessor :height, :width

  def area
    @height * @width
  end

end
class Square < Rectangle
  def height=(height)
    @side = height
  end

  def width=(width)
    @side = width
  end

  def area
    @side * @side
  end
end

class Program
  def initialize(name, height, width)
    if name == :square
      @shape = Square.new
      @shape.height = height
    else
      @shape = Rectangle.new
      @shape.height = height
      @shape.width = width
    end
  end

  def area
    @shape.area
  end
end