Problem: You need to define property observers - didSet for all the properties except Account number and customer name. They should have private set so that they cannot be modified outside the class.
A. Define a description as computed property which displays all the values of a BankAccount object.
B. Define two designated initializers, one which initializes all the properties to their default values and one which initializes to appropriate values (chosen by user)
C. Define two functions- one is credit(amount:Double) { } which is used for depositing money and second which is debit(amount:Double) { ...} which is used for withdrawing money. Customer can have any numbers of withdrawals. After every withdrawal, account balance should be greater than or equal to $10.00
D. Add a deinitializer also. deInit { }