Chapter 15, Problem 13PC

Pure Abstract Base Class Project

Define a pure abstract base class called BasicShape. The BasicShape class should have the following members:

Private Member Variable:

area: A double used to hold the shape’s area.

Public Member Functions:

get Area: This function should return the value in the member variable area.

calcArea: This function should be a pure virtual function.

Next, define a class named Circle. It should be derived from the BasicShape class. It should have the following members:

Private Member Variables:

centerX: a long integer used to hold the x coordinate of the circle’s center

centerY: a long integer used to hold the y coordinate of the circle’s center radius: a double used to hold the circle’s radius Public Member Functions:

constructor: accepts values for centerX. centerY, and radius. Should call the overridden calcArea function described below.

getCenterX: returns the value in centerX

getCenterY: returns the value in centerY

calcArea: calculates the area of the circle (area = 3.14159 * radius * radius) and stores the result in the inherited member area.

Next, define a class named Rectangle. It should be derived from the BasicShape class. It should have the following members:

Private Member Variables:

width: a long integer used to hold the width of the rectangle

length: a long integer used to hold the length of the rectangle

Public Member Functions:

constructor: accepts values for width and length. Should call the overridden

calcArea function described below.

getWidth: returns the value in width.

get Length: returns the value in length.

calcArea: calculates the area of the rectangle (area = length * width) and stores the result in the inherited member area.

After you have created these classes, create a driver program that defines a Circle object and a Rectangle object. Demonstrate that each object properly calculates and reports its area.