class Account
  ## has a balance / return the balance (get/set)
  #
  attr_accessor :balance
  attr_accessor :bank

  ## has a label
  #
  attr_accessor :label

  def initialize(label)
    self.label = label
    self.balance = 0.0
    self
  end

  ##
  # deposit funds
  def deposit(amount)
    self.bank.deposit(amount, self)
  end

  ##
  # withdraw funds
  def withdraw(amount)
    self.bank.withdraw(amount, self)
  end
end