Pure Abstract Base Class ProjectDefine a pure abstract base class called BasicShape. The BasicShape class shouldhave the following members:Private Member Variable:area, a double used to hold the shape's area.Public Member Functions:getArea. 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. Itshould 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 callthe 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 BasicShapeclass. 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 overriddencalcArea function described below.getWidth—returns the value in width.getLength—returns the value in length.calcArea—calculates the area of the rectangle (area = length * width) and storesthe result in the inherited member area. After you have created these classes, create a driver program that defines a Circleobject and a Rectangle object. Demonstrate that each object properly calculates andreports its area.

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:
getArea. 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.
getLength—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.