Q4. Write a Circle class (interface and implementation) 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 setter function for the radius variable. .getRadius. A getter function for the radius variable. .getArea. Returns the area of the circle, which is calculated as area = pi * radius * radius .getCircumference. Returns the circumference of the circle, which is calculated as - circumference = 2 * pi * radius Write a program that creates two Circle objects by asking the user for the radius of each circle, and then reporting each circle's area and circumference. Also, compare the areas of the two circles and display which has more area. Input Validation: Do not accept negative values for the radius