using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            int comp, num1, num2 = 0;

            String ans;

​

            do

            {

                //Menu only

                Console.WriteLine("1. Positive/Negative");

                Console.WriteLine("2. Square root");

                Console.WriteLine("3. Loop (User Input)");

​

​

                // Beginning of Statments

                Console.WriteLine("ENTER NUMBER 1-3");

                comp = Convert.ToInt32(Console.ReadLine());

​

                switch (comp)

                {

                    case 1:

                        Console.Write("ENTER A NUMBER: ");

                        num1 = Convert.ToInt32(Console.ReadLine());

                        if (num1 >= 0)

                        {

                            Console.WriteLine("Positive");

                        }

                        else

                        {

                            Console.WriteLine("Negative");

                        }

                        break;

                    case 2:

                        Console.Write("ENTER A NUMBER: ");

                        num2 = Convert.ToInt32(Console.ReadLine());

                        double x = num2;

                        Console.Write(Math.Sqrt(x)); 

                        break;

                    case 3:

                        Console.Write("ENTER A NUMBER: ");

                        num1 = Convert.ToInt32(Console.ReadLine());

​

                        while(num1 != 0)

                        {

                            num2 = num1 + num2;

                            Console.WriteLine("result: " + num2);

​

                            Console.Write("Enter a number: ");

                            num1 = Convert.ToInt32(Console.ReadLine());

                        }

                        Console.WriteLine("\n last result: " + num2);

                        break;

                }

                Console.WriteLine("");

                Console.WriteLine("DO YOU WANT TO TRY AGAIN?? [Y]");

                ans = Console.ReadLine();

            } while (ans == "y" || ans == "Y");

        }

    }

}