Chapter 13, Problem 8PC

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, then reporting the circle’s area, diameter, and circumference.