using System;

​

public class Program

{

    static decimal pi = 3.14159M;

    static private decimal VofCone(decimal r, decimal h)

    {

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

    }

​

    static private decimal VofCyl(decimal r, decimal h)

    {

        return pi * r * r * h;

    }

​

    static private decimal VofSph(decimal r)

    {

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

    }

​

    public static void Main()

    {

        Console.WriteLine("Would you like to calculate the volume of a cone, a cylinder, or a sphere?");

        Console.WriteLine("Press 1 for the volume of a cone.");

        Console.WriteLine("Press 2 for the volume of a cylinder.");

        Console.WriteLine("Press 3 for the volume of a sphere.");

    }

}