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());

​

            if (b == 1)

            {

                Console.WriteLine("\nGive Details\n");

                Console.Write("Length(cm) : ");

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

                Console.Write("Width(cm) : ");

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

                double dummy = firstnumber*secondnumber ;

                double result1 = dummy*6  ;

                Console.WriteLine("Surface area of cube :{0}cm",result1);

                Console.ReadLine();

            }

            else if (b == 2)

            {

                Console.WriteLine("\nGive Details\n");

                Console.Write("Height(cm) : ");

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

                Console.Write("lengthcube(cm) : ");

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

                Console.Write("lengthcuboid(cm) : ");

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

                double dummy1 = firstnumber*secondnumber ;

                double result1 = dummy1*2  ;

                double dummy2 = firstnumber*thirdnumber ;

                double result2 = dummy2*4  ;

                double result3 = result1+result2 ;

                Console.WriteLine("Surface area of cube :{0}cm",result3);

            }

            Console.ReadLine();

            Console.Clear();

        }

    }

}

​

​