using System;

public class Program

{ static decimal pi = 3.14159M;

    static private decimal SAofCone(decimal r, decimal h)

    {

        decimal r2= r*r;

        return pi * r2 + pi * r * h;

    }

​

    static private decimal SAofCylinder(decimal r, decimal h)

    {

        decimal r2= r*r;

        return 2 * pi * r * h + 2 * pi * r2;

    }

​

    static private decimal SAofSphere(decimal r)

    {

        decimal r2= r*r;

        return 4 * pi * r2;

    }

    static private decimal VCON(decimal r, decimal h)

    {

        decimal r2= r*r;

        return (1M / 3M) * pi * r2* h;

    }

​

    static private decimal VSPH(decimal r)

    {

        decimal r3= r*r*r;

        return (4M / 3M) * pi * r3;

    }

​

    static private decimal VCYL(decimal r, decimal h)

    {

        decimal r2= r*r;

        return pi * r2* h;

    }

​

​

​

​

    public static void Main()

    {

string restart = "  ";

        while (restart != "q" && restart != "Q") {

​

                part1:

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

        string choice = Console.ReadLine();

        if(choice == "1")

        {Console.WriteLine("Please Enter the radius and then the height of your cone.");

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

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

         Console.WriteLine("The surface area of your cone is: " + SAofCone(radius,height).ToString("##.##"));

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

        }

        else if(choice == "2")

        {Console.WriteLine("Please Enter the radius of your circle and the height of your cylinder.");

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

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

         Console.WriteLine("The surface area of your cylinder is: " + SAofCylinder(radius,height).ToString("##.##")); 

         Console.WriteLine("The volume of your cylinder is: " + VCYL(radius,height).ToString("##.##")); 

        }

        else if(choice == "3")

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

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

         Console.WriteLine("The surface area of your sphere is: " + SAofSphere(radius).ToString("##.##")); 

         Console.WriteLine("The volume of your sphere is: " + VSPH(radius).ToString("##.##")); 

        }

        else {

            Console.Clear();

            Console.WriteLine("Please enter a valid option");

            goto part1;

        }

        Console.WriteLine("  ");

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

                restart = Console.ReadLine();

                Console.Clear();

    }

    }

}

​

​