using System;

​

public class MyProgram

{

    private static Random random = new Random();

    public static void Main(String[] args)

    {

        String[] userNameArray = new String[5];

        int[] passwordArray = new int[5];

        int x;

        String userName;

        int password;

        Boolean found;

        int failedAttempts;

        failedAttempts = 0;

        for (x = 0 ; x <= 4 ; x += 1)

        {

            int a;

            int b;

            int c;

            a = random.Next(25) + 65;

            b = random.Next(25) + 65;

            c = random.Next(25) + 65;

            userNameArray[x] = (char) (a) + (char) (b) + (char) (c);

            a = random.Next(9) + 1;

            b = random.Next(9);

            c = random.Next(9);

            passwordArray[x] = a * 100 + b * 10 + c * 1;

        }

        Console.WriteLine("user, Pwd");

        for (x = 0 ; x <= 4 ; x += 1)

        {

            Console.WriteLine(userNameArray[x] + ", " + passwordArray[x]);

        }

        found = false;

        while (failedAttempts < 3 && found == false)

        {

            Console.WriteLine("Please enter your user name: ");

            input(out userName);

            Console.WriteLine("Please enter your password: ");

            input(out password);

            found = false;

            x = 0;

            while (x < userNameArray.Length && found == false)

            {

                if (userName == userNameArray[x] && password == passwordArray[x])

                {

                    found = true;

                }

                else

                {

                    x = x + 1;

                }

            }

            if (found == false)

            {

                failedAttempts = failedAttempts + 1;

                Console.WriteLine("You entered the wrong username and or password. Try again. After three failed login attempts you will be locked out.");

            }

        }

        if (found == true)

        {

            Console.WriteLine("Welcome to the system...");

        }

        else

        {

            Console.WriteLine("Access denied. Third login attempt unsuccessfull. Your automatically locked out forever.");

        }

    }

    // .NET can only read single characters or entire lines from the console.

    // The following functions are designed to help input specific data types.

    private static void input(out double result)

    {

        while (!double.TryParse(Console.ReadLine(), out result));

    }

    private static void input(out int result)

    {

        while (!int.TryParse(Console.ReadLine(), out result));

    }

    private static void input(out Boolean result)

    {

        while (!Boolean.TryParse(Console.ReadLine(), out result));

    }

    private static void input(out string result)

    {

        result = Console.ReadLine();

    }

}

​