using System;

public class Program

{

    public static void Main()

    {

​

​

            Console.Write("Enter how many square roots you want to calculate: ");

​

            // Check if input is a valid double using TryParse

            validInput = double.TryParse(Console.ReadLine(), out userInput);

​

            if (!validInput)

            {

                Console.WriteLine("Error: Please enter a valid number.");

                continue; // Restart the loop

            }

​

            // Check if input is negative

            if (userInput < 0)

            {

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

                validInput = false; // Set validInput to false to restart the loop

            }

        } while (!validInput);

​

        // Output square roots

        for (int i = 1; i <= userInput; i++)

        {

            double squareRoot = Math.Sqrt(i);

            Console.WriteLine("The square root of " + i + " = " + squareRoot.ToString("0.###"));

        }

​

        // Continuity using a while loop

        Console.WriteLine("Do you want to continue? (yes/no)");

        string response = Console.ReadLine().ToLower();

​

        while (response == "yes")

        {

            Main(); // Restart the program

        }

​

        Console.WriteLine("Program ended.");

​

    }

}