using System;

​

public class Program

{

    static decimal pi = 3.14159M;

    static private decimal volofcone(decimal r, decimal h)

    {

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

    }

​

    static private decimal volofcylinder(decimal r, decimal h)

    {

        return pi * r * r * h;

    }

​

    static private decimal volofsphere(decimal r)

    {

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

    }

​

    public static void Main()

    {

        oops:

            string restart = "hi";

        while (restart != "q")

        {

            Console.WriteLine("Press 1 to calculate the volume of a cone, 2 to calculate the volume of a cylinder, and 3 to calculate the volume of a sphere.");

            string choice = Console.ReadLine();

            if (choice == "1")

            {

                Console.Clear();

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

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

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

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

                Console.WriteLine("The volume of the cone is: " + volofcone(radius, height).ToString("##.##"));

            }

            else if (choice == "2")

            {

                Console.Clear();

                Console.WriteLine("Please Enter the radius of the cylinder.");

                decimal radius2 = decimal.Parse(Console.ReadLine());

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

                decimal height2 = decimal.Parse(Console.ReadLine());

                Console.WriteLine("The volume of the cylinder is: " + volofcylinder(radius2, height2).ToString("##.##"));

            }

            else if (choice == "3")

            {

                Console.Clear();

                Console.WriteLine("Please Enter the radius of your sphere.");

                decimal radius3 = decimal.Parse(Console.ReadLine());

                Console.WriteLine("The volume of the sphere is: " + volofsphere(radius3).ToString("##.##"));

            }

            else

            {

                Console.WriteLine("Enter a valid option.");

                goto oops;

            }

​

            Console.WriteLine("Press q to quit or anything else to continue.");

            choice = Console.ReadLine();

            Console.Clear();

        }

    }

}