figure task from Denys
class Figure
attr_reader :radius
def initialize(color,radius)
@color = color
@radius = radius
raise "first argument needs to be a string" unless color.class == String
raise "second argument needs to be a fixnum" unless radius.class == Fixnum
end
def calculate_area
puts "#{@color.to_s} #{self.class.to_s.downcase} has #{self.prepared_area.round(2).to_s} area}"
end
end
class Circle < Figure
def prepared_area
p radius**2 * Math::PI
end
end
class Square < Figure
def prepared_area
p radius**2
end
end
c = Circle.new('blue', 10)
c.calculate_area
sq = Square.new('yellow', 12)
sq.calculate_area