using System;

​

public class Program

{

    public static void Main()

    {

​

            string restart = "This value can be anything.";

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

        {

            Console.Write("What number would you like the square root of?");

            string sn = Console.ReadLine();

            double n;

            double i = 1;

            do

            {

                Console.WriteLine(" The square root of: " + i + " is = " + Math.Sqrt(i).ToString("##.###"));

                i++;

            }

            while (i <= n);

            Console.WriteLine("Press q to quit or anything else to restart.");

            restart = Console.ReadLine();

        }

        else

        {

            Console.WriteLine("Please enter a positive number");    

            }

        }

    }

​

​