Inheritance$/$Virtual functions

Write a C$++$ program that performs the following tasks:

class Shape

Create a base class Shape with the following features:

area$()$: A pure virtual method area$()$ to calculate the area of the shape.

class Rectangle

Rectangle class is a public derived class of Shape class.

Attributes:

length $($double$)$

width $($double$)$

Method:

setlength

setwidth

setLength

setwidth

getLength

getwidth

area $($override function$)$

class Circle

Circle class is a public derived class of Shape class.

Attributes:

radius $($double$)$

Method:

setRadius

getRadius

area $($override function$)$

getRadius

$($override function$)$

Note: Use M$\_$PI for constant value $($value of $)$

Output Example

Enter length and width of the rectangle: $4536$

Enter radius of the circle: $8\mathrm{.}3$

Rectangle Area: $1620$

Circle Area: $216\mathrm{.}424$