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Exercise 2

Add a class variable to your superclass that can keep track of the number of objects created that inherit from the superclass. Create a method to print out the value of this class variable as well.

Solution

class Vehicle
  @@number_of_vehicles = 0

  def self.number_of_vehicles
    puts "This program has created #{@@number_of_vehicles} vehicles"
  end

  def self.gas_mileage(gallons, miles)
    puts "#{miles / gallons} miles per gallon of gas"
  end

  def initialize
    @@number_of_vehicles += 1
  end
end

class MyCar < Vehicle
  NUMBER_OF_DOORS = 4
  #code omitted for brevity...
end

class MyTruck < Vehicle
  NUMBER_OF_DOORS = 2
end

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