In C++

8. Circle Class Write a Circle class that has the following member variables: radius: a double pi: a double initialized with the value 3.14159 The class should have the following member functions: Default Constructor. A default constructor that sets radius to 0.0. Constructor. Accepts the radius of the circle as an argument. setRadius. A mutator function for the radius variable. getRadius. An accessor function for the radius variable. getArea. Returns the area of the circle, which is calculated as area = pi + radius * radius getDiameter. Returns the diameter of the circle, which is calculated as diameter = radius 2 getcircumference. Returns the circumference of the circle, which is calculated as circumference = 2 * pi * radius Write a program that demonstrates the circle class by asking the user for the circle's radius, creating a Circle object, and then reporting the circle's area, diameter, and circumference. A. add the center of the circle as part of the attributes B. Print the equation of the circle with center C(h,k) (x - hp? + (y k)2 = r2