Intermediate Programming: CMPSC 122 Lab 9 Inheritance And Po ✓ Solved

Intermidiate Programmingcmpsc 122lab 9 Inheritance And Polymorphisims

Practice inheritance and polymorphism in C++. Modify the patientType class to include admission and discharge dates using the Date class. Create a vector of pointers to TeamPerson objects, filling it with objects of TeamPerson, doctorType, and patientType. Print all object data according to their respective print functions. Submit the project as a ZIP file called “Lab9” including the solution file.

Sample Paper For Above instruction

Introduction

Inheritance and polymorphism are core concepts in object-oriented programming (OOP), enabling code reuse, flexibility, and dynamic behavior. This paper explores the practical application of these principles through a structured lab assignment in C++, focused on a healthcare context involving classes such as TeamPerson, doctorType, and patientType. The goal is to extend the existing class hierarchy, implement new data members with appropriate constructors and methods, utilize pointers and polymorphic behaviors, and produce output that correctly reflects each object's specific data.

Extending the patientType Class with Admission and Discharge Dates

The first task involves enhancing the patientType class to contain admission and discharge dates, represented by the Date class. The Date class, as previously defined, contains constructors, accessors, mutators, and an overloaded

Constructors in patientType need to be overloaded to initialize all data members, including the new date fields. Setter and getter functions facilitate access and modification of these dates. For example, during object creation, the constructor should accept parameters for admission and discharge dates, which initialize the corresponding Date members.

This extension not only demonstrates class composition but also enforces data encapsulation and promotes reusability of the Date class across different contexts. Proper use of constructors and member functions ensures that patient data, including hospital stay periods, are accurately stored and manipulated.

Creating a Vector of Base Class Pointers and Polymorphic Printing

The second task involves creating a vector of pointers to the base class, TeamPerson. This setup takes advantage of polymorphism, allowing for a collection of heterogeneous objects sharing a common interface. Fill this vector with at least three objects: a TeamPerson object, a doctorType object, and a patientType object.

Instantiation can be achieved via dynamic memory allocation, ensuring each object is appropriately initialized with relevant data. Ensuring proper virtual functions, specifically the print() function, allows each object to implement its own version that displays data specific to its class type.

The program then iterates through the vector, invoking the print() method on each pointer. Due to virtual dispatch, the correct subclass printer executes, showcasing different data for each object type. This process epitomizes polymorphism, where a common interface adapts to different object implementations seamlessly.

Demonstrating Correct Output and Object Behavior

Printing outputs for the created objects includes details such as the name, specialty (for doctorType), ID and age (for patientType), and dates (for patientType). Correctly overriding the print() functions in each subclass ensures clear and accurate display of each object's data.

Furthermore, in a well-designed program, destructors should be virtual to handle cleanup properly when deleting base class pointers, preventing memory leaks.

Conclusion

This lab exercise emphasizes critical OOP techniques, including class inheritance, encapsulation, dynamic polymorphism, and proper object management. By extending the patientType class with date information and employing base class pointers with virtual functions, students gain insights into designing flexible, reusable code for complex applications like healthcare management systems. These principles are fundamental to structured software engineering, reinforcing best practices in code organization, data abstraction, and runtime behavior control.

References

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