using System;

​

public class Program

{

    public static void Main()

    {

        while (true)

        {

            Console.WriteLine("\t\t\t\tWELCOME TO AREA/VOLUME CALCULATOR");

            Console.WriteLine("\t\t\t\t__________________________________");

            Console.WriteLine("Please Chose Your Calculator :\n");

            Console.WriteLine("1 - 3D SURFACE AREA");

            Console.WriteLine("2 - 3D VOLUME CALCULATOR");

            double a = Convert.ToDouble(Console.ReadLine());

​

            if (a == 1)

            {

                Console.WriteLine("please select a type of 3d surface area");

                Console.WriteLine("\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t");

                Console.WriteLine("1 - Cube");

                Console.WriteLine("2 - Cuboid");

                Console.WriteLine("3 - Cone");

                Console.WriteLine("4 - Sphere");

                Console.WriteLine("5 - Pyramid");

                Console.WriteLine("6 - Cylinder");

                double b = Convert.ToDouble(Console.ReadLine());

​

​

            }

            else if (a == 2)

            {

​

            }

            Console.Clear();

        }

    }

}

​