using System;

public class Program

{

    static decimal pi = 3.14159M;

    static private decimal VCON(decimal r, decimal h)

    {

        return (1M / 3M) * pi * r * r * h;

    }

​

    static private decimal VSPH(decimal r)

    {

        return (4M / 3M) * pi * r * r * r;

    }

​

    static private decimal VCYL(decimal r, decimal h)

    {

        return pi * r * r * h;

    }

​

    static private decimal SACone(decimal r, decimal h)

    {

        double r2 = (double)r*(double)r;

        double h2 = (double)h*(double)h;

        double slant = Math.Sqrt(r2+h2);

        return pi*r*r + pi*r*(decimal)slant;

    }

    static private decimal SACylinder(decimal r, decimal h)

    {

        decimal r2 = r*r;

        decimal p1 = 2M*pi*r2;

        decimal p2 = 2M*pi*r*h;

        return p1+p2;

    }

    static private decimal SASphere(decimal r)

    {

        decimal r2 = r*r;

        return 4M*pi*r2;

    }

    public static void Main()

    {

        string choice = "ParseyParse";

        while (choice != "Q" && choice != "q")

        {

            Console.WriteLine("Please input to find the surface area and volume of one of the following: 1 for cone, 2 for cylinder, 3 for sphere.");

            error:

            ulong inp = ulong.Parse(Console.ReadLine());

            if (inp == 1)

            {

                Console.WriteLine("Please enter the value of the radius.");

                decimal r = decimal.Parse(Console.ReadLine());

                Console.WriteLine("Please enter the value of the height.");

                decimal h = decimal.Parse(Console.ReadLine());

                Console.WriteLine("The surface area of the cone: " + SACone(r,h).ToString("##.##"));

                Console.WriteLine("The volume of the cone: " + VCON(r,h).ToString("##.##"));

            }

            else if (inp == 2)

            {

                Console.WriteLine("Please enter the value of the radius.");

                decimal r = decimal.Parse(Console.ReadLine());

                Console.WriteLine("Please enter the value of the height.");

                decimal h = decimal.Parse(Console.ReadLine());

                Console.WriteLine("The surface area of the cylinder: " + SACylinder(r,h).ToString("##.##"));

                Console.WriteLine("The volume of the cylinder: " + VCYL(r,h).ToString("##.##"));

            }

            else if (inp == 3)

            {

                Console.WriteLine("Please enter the value of the radius.");

                decimal r = decimal.Parse(Console.ReadLine());  

                Console.WriteLine("The surface area of the sphere: " + SASphere(r).ToString("##.##"));

                Console.WriteLine("The volume of the sphere: " + VSPH(r).ToString("##.##"));

            }

            else 

            {

                Console.WriteLine("Please enter one of the choices.");

                goto error;

            }

        Console.WriteLine("Please enter q to quit and any other key to continue");

        choice = Console.ReadLine();

        Console.Clear();

        }

    }

}