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def weather(sym)
  {:san_francisco => 60, :chicago => 30, :miami => 70, :los_angeles => 80, :anchorage => 10}[sym]
end

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class Numeric
  def factorial()
    self < 0 ? raise("You can't take the factorial of a negative number") : factorial_h(1,self)
  end

  def factorial_h(accum, n)
   n <= 1 ? accum : factorial_h(accum * n, n -1 )
  end
end

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class Numeric
  def fibonacci()
    if self < 0 
      raise "Cannot Fibonacci a negative number"
    elsif [0,1].include? self 
      self
    else
      ar = [0,1]
      2.upto(self) do |n|
        ar << ar[0] + ar[1]

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module InWords
  def in_words()
  
    if self == 0
      return "zero"
    end
    
    lvl_array = %w{ not_called thousand million billion trillion }
    max_lvl = (self.to_s.length - 1) / 3
    n = self

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class Rectangle
  def initialize(length, width)
    @length = length
    @width = width
  end
  
  def perimeter
    (@length + @width) * 2
  end
  

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class Die
  attr_accessor :sides 
  def initialize(sides)
    @sides = sides
  end
  
  def roll
    rand(sides) + 1
  end
end

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class Dictionary
  attr_accessor :entries, :keywords
  def initialize()
    @entries = {}
    @keywords = []
  end
  
  def add(input)
    if input.is_a?(String)
      str = input

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class Book
  attr_reader :title  
  
  def initialize()
    @title = ""
  end
  
  def title=(str)
    accum = []
    str.split.each_with_index do |word, indx| 

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class RPNCalculator

  def initialize()
    @num_store = []
  end
  
  def push(n)
    @num_store << n
  end
  

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class Array
  def new_collect
    ar = []
    self.each do |i|
      ar << yield(i)
    end
    ar
  end
end