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#!/usr/bin/ruby -w
# define a class
class Box
# constructor method
def initialize(w,h)
@width, @height = w, h
end
# instance method
def getArea
@width * @height
end
end
# define a subclass
class BigBox < Box
# add a new instance method
def printArea
@area = @width * @height
puts "Big box area is : #@area"
end
end
# create an object
box = BigBox.new(10, 20)
# print the area
box.printArea()
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