Question

我正在使用Ruby创建银行帐户。即使已经定义了方法，我也会收到未定义的方法或局部变量错误，有人可以告诉我这段代码有什么问题吗？我尝试重写main_menu方法，但仍然遇到同样的错误。

class Account
  attr_reader :name, :checking_account, :savings_account

  def initialize(name, checking_account, savings_account)
    @name = name
    @checking_account = checking_account
    @savings_account = savings_account
  end
end

def display
  puts "Enter your PIN:"
  input = gets.chomp

  if input = pin
    main_menu
  else
    bad_pin
  end
end

def main_menu
  puts """
    Welcome back #{name}!
    Would you like to:
    Display Balance press '1'
    Make Withdrawl press '2'
    Make Deposit press '3'
    Exit press '4'
  """

  input = gets.chomp

  case option
    when 1
      balance
    when 2
      withdrawl
    when 3
      deposit
    else
      exit
  end
end

def balance
  puts "Which balance? Checking or Savings?"
  input = gets.chomp

  if input =~ /checking/i
    puts "Your balance for your Checking Account is: $#{checking_account}."
  elsif input =~ /savings/i
    puts "Your balance for your Savings Account is: $#{savings_account}."
  else
    main_menu
  end
end

def withdrawl(pin_number, amount)
  puts "Enter PIN to make a withdrawl:"
  input = gets.chomp

  case withdrawl
    when checking_account
      @checking_account -= amount
      puts "You have withdrawn $#{amount}; you now have ${checking_account} in your checking."
    when savings_account
      @savings_account -= amount
      puts "You have withdrawn ${amount}; you now have $#{savings_account} in your savings."
    else
      bad_pin
  end
end

def deposit
  puts "Which account would you like to deposit into: Checkings, or Savings?"
  input = gets.chomp

  if input =~ /checking/i
    @checking_account += amount
    puts "You have made a deposit of $#{amount} leaving you with $#{checking_account}."
  elsif input =~ /savings/i
    @savings_account += amount
    puts "You have made a deposit of $#{amount} leaving you with $#{savings_account}."
  else
    main_menu
  end
end

def pin
  @pin = 1234
end

def bad_pin
  puts "Access Denied: incorrect PIN"
  exit
end

my_account = Account.new("Thomas", 500_000, 750_000)
display

我收到的错误是：

bank.rb:25:in `main_menu': undefined local variable or method `name' for main:Object (NameError)
        from bank.rb:16:in `display'
        from bank.rb:101:in `<main>'

Answer 1

您必须将所有这些方法放入Account类主体中。否则，他们将看不到实例变量或attr_reader方法。

class Account
  attr_reader :name, :checking_account, :savings_account

  def initialize(name, checking_account, savings_account)
    @name = name
    @checking_account = checking_account
    @savings_account = savings_account
  end
end   # <---- This closes your class, it has to be moved past the last method

通过适当的缩进立即可以看到此错误。

最后，您拨打display的{{1}}：

my_account

Answer 2

移动类

中的所有方法

并在类的实例上调用您的显示方法，即在您的情况下调用my_account

这应该可以做到！：）

制作银行账户

2 个答案: