using System;

public class Program

{static decimal pi = 3.14159M;

 static private decimal VCON(decimal r, decimal h)

    {

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

    }

​

    static private decimal VSPH(decimal r)

    {

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

    }

​

    static private decimal VCYL(decimal r, decimal h)

    {

        return pi * r * r * h;

    }

static private decimal SACone(decimal r, decimal h)

    {

        double r2 = (double)r * (double)r;

        double h2 = (double)h * (double)h;

        double slant = Math.Sqrt(r2 + h2);

        return pi * r * r + pi * r * (decimal)slant;

    }

​

    static private decimal SASphere(decimal r)

    {

        decimal r2 = r * r;

        return 4M * pi * r2;

    }

​

    static private decimal SACyl(decimal r, decimal h)

    {

        decimal r2 = r * r;

        decimal h2 = h * h;

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

    }

​

​

 static private decimal SaofCone(decimal r, decimal h)

{ double r2 = (double)r * (double)r;

 double h2 = (double)h * (double)h;

double slant = Math.Sqrt(r2 + h2);

return pi*r *r + pi * r * (decimal)slant;

}

 static private decimal Sphere( decimal r)

 { decimal r2 = r*r;

   return 4 * pi * r2;

 }

​

 static private decimal cylinder( decimal r, decimal h)

 { decimal r2 = r*r;

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

 }  

    public static void Main()

    {

        Start:

        string restart = "random";

        while (restart != "q")

        {

        Console.WriteLine("Please enter 1 to find the surface area and volume of a Cone, 2 for the surface area and volume of a Cylinder, 3 for the surface area and volume of a Sphere");

        string choice = Console.ReadLine();

        if (choice == "1")

        { Console.WriteLine("Please enter the raduis and height");

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

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

         Console.WriteLine("The surface area of the cone is " + SaofCone(raduis, height).ToString("##.##"));

          Console.WriteLine("The volume of the cone is " + VCON(raduis, height).ToString("##.##"));

         Console.WriteLine("Press q to quit or any other key to continue");

         restart = Console.ReadLine();

         Console.Clear();

         }

        else if (choice == "2")

        { Console.WriteLine("Please enter the raduis and height");

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

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

         Console.WriteLine("The surface area of the cylinder is " + cylinder(raduis, height).ToString("##.##"));

         Console.WriteLine("The Volume of the cylinder is " + VCYL(raduis, height).ToString("##.##"));

         Console.WriteLine("Press q to quit or any other key to continue");

         restart = Console.ReadLine();

         Console.Clear();

         }

            else if (choice == "3")

        { Console.WriteLine("Please enter the raduis");

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

         Console.WriteLine("The surface area of the Sphere is " + Sphere(raduis).ToString("##.##"));

          Console.WriteLine("The volume of the Sphere is " + VSPH(raduis).ToString("##.##"));

         Console.WriteLine("Press q to quit or any other key to continue");

         restart = Console.ReadLine();

         Console.Clear();

        }

         else

        { Console.WriteLine("Please enter an option");

         goto Start;

        }

        }

    }

}

​