question.rb

class BankAccount
  attr_reader :balance, :number_of_withdrawals

  def initialize(balance) #constructor
    @balance = balance
    @number_of_withdrawals = 0
  end

  def display_balance
    @balance
  end

  def deposit(amount)
    if(amount > 0)
      @balance += amount
    else
    'Cannot deposit negative amounts or 0'
    end
  end

  def withdraw(amount) #setter
      if (amount <= @balance)
      @balance -= amount
      @number_of_withdrawals += 1
    else
      'Insufficient funds'
    end
  end

end

class CheckingAccount < BankAccount

  attr_reader :number_of_withdrawals

  MAX_FREE_WITHDRAWALS = 3

  def get_free_withdrawal_limit
    MAX_FREE_WITHDRAWALS
  end

  def initialize(balance)
    super(balance) # calls the parent initialize constructor and variable
    @number_of_withdrawals = 0
  end

  def deposit
    super
  end

 def withdraw(amount)
  super
  if (@number_of_withdrawals > MAX_FREE_WITHDRAWALS)
    @balance -= 5
  end
 end

  def transfer(account, amount)
    self.withdraw(amount)
    account.deposit(amount)
  end

end