class Account
  attr_reader :name
  attr_reader :balance

  def initialize (name, balance = 100)
      @name = name
      @balance = balance
  end

  private
  def pin (pin = 1234)
      @pin = pin
  end

  private
  def pin_error
      return "Access denied: incorrect PIN."
   end

   public
   def display_balance(pin_number)
       pin_number == pin ? puts "Balance: $#{@balance}." : pin_error
   end

   public
   def withdraw(pin_number, amount)
       pin_number == pin ? (@balance -= amount) : (pin_error)
   end

end