namespace Homework3
{
    class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Enter the radius of a sphere");

            int radius = 0;
            bool validInput = false;
            while (!validInput)
            {
                var input = Console.ReadLine();
                try
                {
                    radius = int.Parse(input);
                    validInput = true;
                }
                catch
                {
                    Console.WriteLine("Input could not be parsed as a double, try again!");
                }
            }

            var sphere = new Sphere(radius);

            Console.WriteLine("The volume of the sphere is {0}", sphere.volume());
            Console.WriteLine("The area of the sphere is {0}", sphere.area());

            Console.WriteLine("Now enter a new radius for the same sphere");

            validInput = false;
            while (!validInput)
            {
                var input = Console.ReadLine();
                try
                {
                    radius = int.Parse(input);
                    validInput = true;
                }
                catch
                {
                    Console.WriteLine("Input could not be parsed as a double, try again!");
                }
            }

            // Radius changed!
            sphere.Radius = radius;
            Console.WriteLine("The volume of the sphere is now {0}", sphere.volume());
            Console.WriteLine("The area of the sphere is now {0}", sphere.area());

        }
    }

    internal class Sphere
    {
        private int _radius = 0;
        public Sphere() { }
        public Sphere(int radius)
        {
            _radius = radius;
        }
        public int Radius
        {
            set
            {
                if (value >= 0)
                    _radius = value;
                else
                    _radius = 0;

                //_radius = Math.Max(0, value);
            }
        }
        public double volume()
        {
            return (4.0 / 3.0) * Math.PI * Math.Pow(_radius, 3);
        }
        public double area()
        {
            return 4.0 * Math.PI * Math.Pow(_radius, 2);
        }
    }


}