program5_calculator.rb

class Calculator
  def initialize(var_x, var_y)
    @var_x = var_x
    @var_y = var_y
  end

  def divide
    @var_x / @var_y
  end
end

class Divider
  def initialize(var_x, var_y)
    @var_x = var_x
    @var_y = var_y
  end

  def calculate
    calculator.divide
  end

  private

  def calculator
    @calculator ||= Calculator.new @var_x, @var_y
  end

  class << self
    def calculate(*args)
      new(*args).calculate
    end
  end
end

p Divider.calculate(3.0, 4)