How to Win a Guessing Game

win_guessing.rb

# How to Win a Guessing Game - Numberphile
# Based on https://www.youtube.com/watch?v=ud_frfkt1t0
class WinGuessing
  def initialize(total_iterations, max_random_num)
    @total_times = total_iterations
    @max_random_num = max_random_num
    @max_length = @max_random_num.to_s.length
    @total_result = 0
  end

  def start
    print_table_headers
    start_iterations
    print_separator
    print_result
  end

  private
    def random_number
      Random.rand(@max_random_num)
    end

    def print_separator
      separator = [*1..@max_length].map{'-'}.join
      printf(format, separator, separator, separator, separator)
    end

    def format
      "%#{@max_length}s\t%#{@max_length}s\t%#{@max_length}s\t%#{@max_length}s\n"
    end

    def print_table_headers
      printf(format, "A", "B", "K", "Result")
      print_separator
    end

    def start_iterations
      @total_times.times do
        a, b, k = random_number, random_number, random_number
        result = a > b if a > k
        result = a < b if a < k
        @total_result += 1 if result
        printf(format, a, b, k, (result ? 'Win' : 'Lose'))
      end
    end

    def print_result
      printf(format, nil, nil, nil, "#{@total_result*100/@total_times}%")
    end
end

game = WinGuessing.new(100, 1000)
game.start