This question tests your understanding of Object Oriented Programming. The follo

Question

This question tests your understanding of Object Oriented Programming. The following code defines the start of a class to represent bank accounts: class BankAccount (object): interest _rate = 0.3 def _init_(self, name, number balance): self.name = name self.number = number self.balance = balance return (a) Name the class variables and the instance variables in the given code. (b) Add instance methods called deposit() and withdraw() which increase and decrease the balance of the account. Make sure the withdraw() method doesn't allow the account to go into overdraft. Add a third method called add_interest() which adds interest to the balance (the interest should be the interest rate multiplied by the current balance. (c) Create a subclass of BankAccount called Student Account. Every StudentAccount should have an overdraft limit of 1000. Write a constructor for the new class. Override the withdraw() method to make sure that students can withdraw money up to their overdraft limits.

Explanation / Answer

a)

class variables - interest_rate

instance variable - name, number, balance

b) class BankAccount(object):
   interest_rate = 0.3
   def __init__(self, name, number, balance):
       self.name = name
       self.number = number
       self.balance = balance
       return;
   def withdraw(self, amount):
       if(amount<balance):
           balance = balance - amount
   def deposit(self, amount):
       balance = balance + amount
   def add_interest():
       balance = balance + (balance*interest_rate)

c) class StudentAccount(BankAccount):
   def __init__(self, name, number, balance):
       BankAccount.__init__(self, name, number, balance)
   def withdraw(self, amount):
       if((balance-amount)>=-1000):
           balance = balance - amount

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