class_variables_syntax.rb

class Car
    
    attr_reader :brand
    @@cars = 0
    def self.number_of_cars
        return @@cars
    end
    
    def initialize(brand)
        @brand = brand
        @@cars += 1 
    end

    def print_brand
        puts "The car brand is: #{@brand}"
    end

end

cars = [
    Car.new('BMW'),
    Car.new('FORD'),
    Car.new('TESLA'),
    Car.new('LAMBORGHINI')
]

american_cars = [
    Car.new('FORD'),
    Car.new('DODGE'),
    Car.new('TESLA'),
    Car.new('CHRYSLER')
]
def print_car_brands(cars)
    puts "-" * 50
    cars.each do |car|
        car.print_brand
    end
end

print_car_brands(cars)
print_car_brands(american_cars)
p Car.number_of_cars
bmw = Car.new('BMW')