In this exercise, you will design various classes and write a program to computerize the billing system of a hospital.

a. Design the class doctorType, inherited from the class personType, defined in Chapter 10, with an additional data member to store a doctors speciality. Add appropriate constructors and mem- ber functions to initialize, access, and manipulate the data members.

b. Design the class billType with data members to store a patients ID and a patients hospital charges, such as pharmacy charges for medicine, doctors fee, and room charges. Add appropriate constructors and member functions to initialize, access, and manipulate the data members.

c. Design the class patientType, inherited from the class personType, defined in Chapter 10, with additional data members to store a patients ID, age, date of birth, attending physicians name, the date when the patient was admitted in the hospital, and the date when the patient was discharged from the hospital. (Use the class dateType to store the date of birth, admit date, discharge date, and the class doctorType to store the attending physicians name.) Add appropriate constructors and member functions to initialize, access, and manipulate the data members. Write a program to test your classes.

d. Explain each part of the code and what it is doing and how the information is passed between classes

Found in C++ Programming: From Problem Analysis to Program Design, 6e page 780

Plase pay close attentition to the class requirements.