using System;

public class Program

{ static decimal pi = 3.14159M;

 static private decimal cone(decimal r, decimal h)

 {

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

 static private decimal ConSuf(decimal r, decimal h)

 {

     return (pi*r*h)+(pi*r*r);}

 static private decimal cyl(decimal r,decimal h)

 {return pi*r*r*h;}

 static private decimal CylSuf(decimal r,decimal h)

 {return (2*pi*r*r)+(2*pi*(r/2));}

  static private decimal sph(decimal r)

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

 static private decimal SphSuf(decimal r)

 {return 4*pi*r*r;}

    public static void Main()

    {start:

        Console.WriteLine("Welcome to the program to claulate the volume and Surface Area");

        Console.WriteLine("Press 1 to calculate the volume and Surface Area of Cone");

        Console.WriteLine("Press 2 to calculate the volume and Surface Area of cylinder");

        Console.WriteLine("Press 3 to calculate the volume and Surface Area of sphere.");

        string choice = Console.ReadLine();

        Console.Clear();

        if(choice == "1")

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

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

         Console.WriteLine("Please Enter the height of your Cone");

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

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

         Console.WriteLine("The Surface Area of your cone is: " + ConSuf(radius,height).ToString("##.##"));

        Console.WriteLine("Would you Like to Run the Program Again? Press 1 for Yes or Press 2 for No");

         int opt =int.Parse( Console.ReadLine());

         if (opt == 2)

         {

             Console.WriteLine("Thank You For Using Our Program");

         }

         else 

         {

             Console.Clear();

             goto start;

         }

        }

        else if(choice == "2")

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

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

         Console.WriteLine("Please Enter the height of your Cylinder");

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

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

          Console.WriteLine("The Surface Area of your Cylinder is: " + CylSuf(radius,height).ToString("##.##")); 

         Console.WriteLine("Would you Like to Run the Program Again? Press 1 for Yes or Press 2 for No");

         int opt =int.Parse( Console.ReadLine());

         if (opt == 2)

         {

             Console.WriteLine("Thank You For Using Our Program");

         }

         else 

         {

             Console.Clear();

             goto start;

         }

        }

        else if(choice == "3")

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

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

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

          Console.WriteLine("The Surface Area of your sphere is: " + SphSuf(radius).ToString("##.##"));

          Console.WriteLine("Would you Like to Run the Program Again? Press 1 for Yes or Press 2 for No");

         int opt =int.Parse( Console.ReadLine());

         if (opt == 2)

         {

             Console.WriteLine("Thank You For Using Our Program");

         }

         else 

         {

             Console.Clear();

             goto start;

         }

        }

    }

}