using System;

​

public class Program

{

    public static void Main()

    {

        Start:

            String restart = "  ";

        while (restart != "q")

        {

            Console.WriteLine("How many numbers would you like to know the square root of?");

            string ans = Console.ReadLine();

            double num;

            if (double.TryParse(ans, out num))

            {

                num = double.Parse(ans);

                if (num < 0)

                {

                    Console.WriteLine("Enter a positive integer");

                    goto Start;

                }

                else if (num > 0)

                {

                    int i = 1;

                    Console.WriteLine("The square roots up to are" + num + ":");

                    Console.WriteLine("  ");

                    do

                    {

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

                        i++;

                    }

                    while (i <= num);

                }

            }

            else

            {

                Console.WriteLine("Enter a positive number.");

                goto Start;

            }

​

            Console.WriteLine("  ");

            Console.WriteLine("Press q to quit or press any other key to continue");

            restart = Console.ReadLine();

        }

    }

}