class RPN

  attr_accessor :calculator

  def initialize
    @calculator = []
  end


  def push(arg)
    @calculator << arg
  end

  def value
    ops = @calculator.last
    num1 = @calculator[-3]
    num2 = @calculator[-2]
    result = choose_method(num1, num2, ops)
  end

  def choose_method(num1,num2, ops)
      if ops == "+"
       plus(num1, num2)
     elsif ops == "-"
       minus(num1, num2)
     elsif ops == "*"
       times(num1, num2)
     elsif ops == "/"
       divide(num1, num2)
     end
   end

   def plus(num1,num2)
     num1 + num2
   end

   # def minus(num1,num2)
   #      num1 - num2
   #    end

  def minus
    result = 0
    @calculator.each do |i|
      result -= i
    end
    result
  end

   def times(num1,num2)
     num1 * num2
   end

   def divide(num1,num2)
     num1.to_f / num2
   end

end

happytesting = RPN.new
happytesting.push(2)
happytesting.push(3)
happytesting.push("*")
puts happytesting.value
# puts happytesting.calculator[-2]