This lab introduces students to the concepts of polymorphism, early binding, late binding, abstract classes, and virtual class functions. This will be done in the context of performing calculations on basic geometrical shapes. Polymorphism is a very powerful extension of inheritance, and by using pointers to the base class, it allows access to derived class objects and their functions based on the context that they are called in. The lab will require the creation of a base geometric class, called Shape, and two sub classes, Circle and Rectangle, that are derived public from the class Shape. From there, objects of both the Circle and the Rectangle classes will be created, as will an array of pointers to the base class Shape. By using the instantiated objects and the object pointers, both static and dynamic binding will be demonstrated.

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COMP/220 iLab 7 of 7 - C++ Course
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iLab 7 of 7: Polymorphism
i L A B O V E R V I E W
Scenario and Summary
This lab introduces students to the concepts of polymorphism, early binding, late binding, abstract
classes, and virtual class functions. This will be done in the context of performing calculations on
basic geometrical shapes. Polymorphism is a very powerful extension of inheritance, and by using
pointers to the base class, it allows access to derived class objects and their functions based on the
context that they are called in.
The lab will require the creation of a base geometric class, called Shape, and two sub classes, Circle
and Rectangle, that are derived public from the class Shape. From there, objects of both the Circle
and the Rectangle classes will be created, as will an array of pointers to the base class Shape. By
using the instantiated objects and the object pointers, both static and dynamic binding will be
demonstrated.
Deliverables
1. Submit a single NotePad file containing the source code for all the lab files to the Week 7
Dropbox. Your source code should use proper indentation and be error free. Be sure that your last
name and the lab number are part of the file name: for example, YourLastName_Lab5.txt.
Each program should include a comment section that includes, at a minimum, your name, the lab
and exercise number, and a description of what the program accomplishes.
2. Submit a lab report (a Word document) containing the following information to the Week 7
Dropbox.
o Include your name and the lab or lab exercise number.
o Specification: Include a brief description of what the program accomplishes, including its
input, key processes, and output.
o Test Plan: Include a brief description of the method you used to confirm that your program
worked properly. If necessary, include a clearly labeled table with test cases, predicted results, and
actual results.
o Summary and Conclusions: Write a statement summarizing your predicted and actual output,
and identify and explain any differences. For conclusions, write at least one nontrivial paragraph that
explains, in detail, either a significant problem you had and how you solved it or, if you had no
significant problems, something you learned by doing the exercise.
o A UML Diagram: This should show all the classes, class members, access specifiers, data
types, and function arguments, along with all of the class-to-class relationships.

2. o Answers to Lab Questions: Include the answers to all the lab questions that are asked in the
lab steps.
Each lab exercise should have a separate section in the lab-report document.
Your lab grade is based upon
1. the formatting of your source code;
2. the use of meaningful identifiers;
3. the extent of the internal documentation;
4. the degree to which an exercises' specifications are met; and
5. the completeness of your lab report.
i L A B S T E P S
STEP 1: Create a New Multifile Project
Create a new multifile project with three classes: the base class Shape, the class Circle (derived
public from Shape), and the class Rectangle (derived public from Shape). The classes will have the
following requirements.
1. The class Shape should be an abstract class with the following pure virtual functions.
a. area()
b. perimeter()
2. The class Circle should be derived public from the class Shape and override both the area()
and the perimeter() functions.
a. The perimeter() function should correctly calculate the circumference of a circle, given a
radius.
b. The area() function should correctly calculate the area of a circle, given a radius
c. Include all the necessary accessor and mutator functions to accomplish the requirements of
the class.
3. The class Rectangle should be derived public from the class Shape and override both the
area() and the perimeter() functions.
a. The perimeter() function should correctly calculate the circumference of a rectangle, given its
dimensions.
b. The area() function should correctly calculate the area of a rectangle, given its dimensions.
c. Include all the necessary accessor and mutator functions to accomplish the requirements of
the class.
STEP 2: Create the Test Function
Instantiate at least one object of each of the Circle and the Rectangle classes. Provide appropriate
constructors for both that will accept the necessary initialization arguments to provide the
information required for all the class member functions. Exercise and test each member function of
both classes for correct calculations and output.
STEP 3: Add a Base Class Pointer Array and an Additional Function
Add to the test function a base class array of pointers of the same dimension as the total number of
Circle and Rectangle objects that were created in the previous step. Use this pointer array to access
the Circle and the Rectangle objects to call a new, nonclass member function that will display all the
information about each object.
1. Circle objects should display radius, circumference, and area.
2. Rectangle objects should display dimensions, perimeter. and area.

3. The information-display function should accept as its calling parameter a pointer of the class Shape.
Run the test function to demonstrate static (early) binding using the derived class objects calling
their member functions, and run the test function to demonstrate dynamic (late) binding using the
assigned Shape class pointers to call the nonclass, member-display-information function.
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