Give the definition of two classes, Patient and Billing , whose objects are records
for a clinic. Patient will be derived from the class Person given in Programming
Project 14.4 . A Patient record has the patient’s name (inherited from the
class Person ) and primary physician, of type Doctor defined in Programming
Project 14.3 . A Billing object will contain a Patient object and a Doctor object,
and an amount due of type double . Be sure your classes have a reasonable complement
of constructors and accessor methods, an overloaded assignment operator,
and a copy constructor. First write a driver program to test all your methods, then
write a test program that creates at least two patients, at least two doctors, at least
two Billing records, then prints out the total income from the Billing records.
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