兔子生兔子问题 斐波那契数列

[ruby]代码库

class Rabbit 
    @@count=0 
    attr_accessor :age 
    def initialize 
        @age=0 
        @@count+=1 
    end 

    def increment 
        @age+=1 
    end 

    def self.quantity 
        @@count 
    end 
end 

first_rabbit=Rabbit.new 
rabbits=Array.new 
rabbits<<first_rabit 
puts "Input the months:" 
n=gets.chomp.to_i 
n.times do |month| 
    puts "#{month} -- #{Rabbit.quantity*2} rabbits" 
    rabits.each do |rabbit| 
        rabbit.increment 
        if rabbit.age>=3 
            rabbits<<Rabit.new 
        end 
    end 
end