using System;

​

public class Program

{

    static decimal pi = 3.14159M;

    static private decimal sphere(decimal r)

    {

        decimal spherevol = (4M / 3M * pi * r * r * r);

        return spherevol;

    }

​

    static private decimal cylinder(decimal r, decimal h)

    {

        decimal cylindervol = (pi * r * r * h);

        return cylindervol;

    }

​

    static private decimal cone(decimal r, decimal h)

    {

        decimal conevol = (h / 3M * pi * r * r);

        return conevol;

    }

​

    public static void Main()

    {

        start:

            Console.WriteLine("type 1 if you would like to find the volume for a sphere, 2 for a cylinder, and 3 for a cone.");

        string choice = Console.ReadLine();

        Console.Clear();

        if (choice == "1")

        {

            Console.WriteLine("You chose the sphere, Please enter a radius.");

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

            Console.WriteLine("The volume for the sphere is " + sphere(radius) + ".");

        }

​

        {

            Console.WriteLine("Would you like to run the program again? y/n");

            string choice2 = Console.ReadLine();

            if (choice2 == "y" || choice2 == "Y")

                goto start;

        }

​

        if (choice == "2")

        {

            Console.WriteLine("You chose the sphere, Please enter a radius.");

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

            Console.WriteLine("Now, enter a number for the height.");

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

            Console.WriteLine("The volume for the cylinder is " + cylinder(radius2, height) + ".");

        }

​

        {

            Console.WriteLine("Would you like to run the program again? y/n");

            string choice2 = Console.ReadLine();

            if (choice2 == "y" || choice2 == "Y")

                goto start;

        }

​

        if (choice == "3")

        {

            Console.WriteLine("You chose the cone, Please enter a radius.");

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

            Console.WriteLine("Now, enter a number for the height.");

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

            Console.WriteLine("The volume for the cone is " + cone(radius3, height) + ".");

            {

                Console.WriteLine("Would you like to run the program again? y/n");

                string choice2 = Console.ReadLine();

                if (choice2 == "y" || choice2 == "Y")

                    goto start;

            }

        }

    }

}