using System;

​

public class Program

{

    public static void Main()

    {

        string restart = Console.ReadLine();

        while (restart != "q")

            ;

        {

            Console.Clear();

            start:

                Console.WriteLine("How many square roots would you like to calculate?");

            string input = Console.ReadLine();

            double n;

            if (double.TryParse(input, out n))

            {

                if (n <= 0)

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

                goto start;

            }

            else

            {

                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();

            }

        }

​

        {

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

        }

    }

}