PI Approximation in Ruby

pi_approximation.rb

module PiApprox
  class PI
    attr_accessor :approximation, :denominator, :sum, :signal

    def initialize(approx = 0, den = 1.0, sum = 0, signal = true)
      @approximation = approx
      @denominator = den
      @sum = sum
      @signal = signal
    end

    def print_approx times=10
      answer = 'y'
      i = 0

      while i < times
        if @signal
          @sum += 1/@denominator
        else
         @sum -= 1/@denominator
        end

        @approximation = 4 * @sum
        @signal = !@signal
        @denominator += 2
        i += 1
      end

      puts %{
        PI approximation - #{@approximation}
        denominator - #{@denominator}
        sum - #{@sum}
        signal - #{@signal}
      }

      puts "Loop again? (y|n)"
      answer = gets.chomp!

      print_approx times unless answer == 'n'

    end

    def reset
      @approximation = 0
      @denominator = 1.0
      @sum = 0
      @signal = true
    end
  end
end