using System;

​

public class Program

{

    static decimal pi = 3.14159M;

    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 SAofCyl(decimal r, decimal h)

    {

        return (2 * pi * r * r) + (2 * pi * r * h);

    }

​

    static private decimal SAofSph(decimal r)

    {

        return 4 * pi * r * r;

    }

​

    public static void Main()

    {

        string restart = "It's not what's on the surface that matters...It's what's on the inside that truly counts.";

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

        {

            Console.Clear();

            Console.WriteLine("-----------------------------");

            Console.WriteLine(" ~ SURFACE AREA CALCULATOR ~ ");

            Console.WriteLine("-----------------------------");

            Console.WriteLine("Welcome to Joe's Surface Area Calculator. Please choose which option you would like to calculate:");

            Console.WriteLine("");

            Console.WriteLine("Press 1 to calculate the surface area of a cone.");

            Console.WriteLine("Press 2 to calculate the surface area of a cylinder.");

            Console.WriteLine("Press 3 to calculate the surface area of a sphere.");

            string choice = Console.ReadLine();

            if (choice == "1")

            {

                Console.Clear();

                Console.WriteLine("------------------");

                Console.WriteLine(" ~ SA of a Cone ~ ");

                Console.WriteLine("------------------");

                Console.WriteLine("What is the radius of the cone?");

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

                Console.Clear();

                Console.WriteLine("What is the height of the cone?");

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

                Console.Clear();

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

            }

​

            if (choice == "2")

            {

                Console.Clear();

                Console.WriteLine("----------------------");

                Console.WriteLine(" ~ SA of a Cylinder ~ ");

                Console.WriteLine("----------------------");

                Console.WriteLine("What is the radius of the cylinder?");

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

                Console.Clear();

                Console.WriteLine("What is the height of the cylinder?");

                decimal height2 = decimal.Parse(Console.ReadLine());

                Console.Clear();

                Console.WriteLine("The surface area of the cone is " + SAofCyl(radius2, height2).ToString("##.###") + ".");

            }

            if (choice == "3")

            {

                Console.Clear();

                Console.WriteLine("--------------------");

                Console.WriteLine(" ~ SA of a Sphere ~ ");

                Console.WriteLine("--------------------");

                Console.WriteLine("What is the radius of the sphere?");

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

                Console.Clear();

                Console.WriteLine("The surface area of the cone is " + SAofSph(radius3).ToString("##.###") + ".");

            }

​

            Console.WriteLine("");

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

            restart = Console.ReadLine();

        }

    }

}