Exercise proposed by Leandro

exercise.rb

class Car

  attr_accessor :color
  attr_accessor :model
    
  def engage_gear(gear)
    @gear = 1
    @gear = gear if gear
  end

  def accelerate
    @status = "stopped"
    @status = 'moving' if @gear > 0
  end

  def reduce
    engage_gear(@gear - 1) if @gear > 0
  end

  def stop
    reduce while @gear > 0
    @status = "stopped"
  end

  def start
    engage_gear(nil)
    accelerate
  end

  def in_gear?
    @gear > 0
  end

  def stopped?
    @status == 'stopped'
  end

  def in_movement?
    @status == "moving"
  end

end

cars = Array.new
(1..10).each { |n| cars << Car.new }

puts "Total of cars is #{cars.length}!"