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Create an inheritance hierarchy that a bank might use to represent customers’ bank accounts. All customers at this bank can deposit (i.e., credit) money into their accounts and withdraw (i.e., debit) money from their accounts. More specific types of accounts also exist. Savings accounts, for instance, earn interest on the money they hold. Checking accounts, on the other hand, charge a fee per transaction (i.e., credit or debit).

A.  Create a base class  Account. Base class Account should include

·  One data member of type double to represent the account balance.

·  A constructor that receives an initial balance and uses it to initialize the data member. The constructor should validate the initial balance to ensure that it is greater than or equal to 0.0. If not, the balance should be set to 0.0 and the constructor should display an error message, indicating that the initial balance was invalid.

·  Member function  Credit should add an amount to the current balance.

·  Member function  Debit should withdraw money from the Account and ensure that the debit amount does not exceed the Account’s balance. If it does, the balance should be left unchanged and the function should print the message “Debit amount exceeded account balance.”

·  Member function  getBalance should return the current balance.

A.  Derived class  SavingsAccount should inherit the functionality of an Account, but also include

·  One data member of type double indicating the interest rate (percentage) assigned to the Account.

·  A constructor that receives the initial balance, as well as an initial value for the interest rate.

·  Member function  calculateInterest that returns a double indicating the amount of interest earned by an account. Member function calculateInterest should determine this amount by multiplying the interest rate by the account balance.

A.  Derived class  CheckingAccount should inherit from base class Account and  also include

·  One data member of type double that represents the fee charged per transaction.

·  A constructor that receives the initial balance, as well as a parameter indicating a fee amount.

·  Class CheckingAccount should redefine member functions  credit and  debit so that they subtract the fee from the account balance whenever either transaction is performed successfully. CheckingAccount’s versions of these functions should invoke the base-class Account version to perform the updates to an account balance. CheckingAccount’s debit function should charge a fee only if money is actually withdrawn (i.e., the debit amount does not exceed the account balance).

[Hint: Define Account’s debit function so that it returns a bool indicating whether money was withdrawn. Then use the return value to determine whether a fee should be charged.]

After defining the classes in this hierarchy, write a program that creates objects of each class and tests their member functions. Add interest to the SavingsAccount object by first invoking its calculateInterest function, then passing the returned interest amount to the object’s credit function.

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