using System;

​

public class MyProgram

{

    private static Random random = new Random();

    public static void Main(String[] args)

    {

        // CPT-230-701 - Assignment 5 

        // Jessie Elizabeth Judkins 

        // 10/22/2017

        String[] usernameArray = new String[5];

        int[] passwordArray = new int[5];

        int index;

        Boolean accessGranted;

        int accessAttempts;

        String username;

        int password;

        accessGranted = false;

        accessAttempts = 0;

        Console.WriteLine("Username & Password");

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

        {

            // The following line of code works in .NET Fiddle and is here as a replacement for the line that does not work. 

            usernameArray[index] = ((char) (random.Next(26) + 65)).ToString() + (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65);

            // The following line of code does not work in .NET Fiddle

            // usernameArray[index] = (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65);

            // The following is an optional line of code to generate the 3 digit password. 

            // passwordArray[index] = ((random.Next(9)+1) * 100) + (random.Next(10)*10) + random.Next(10);

            passwordArray[index] = random.Next(899) + 100;

            Console.WriteLine("   " + usernameArray[index] + "   &   " + passwordArray[index]);

        }

        while (accessGranted != true && accessAttempts < 3)

        {

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

            input(out username);

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

            input(out password);

            index = 0;

            while (index < 5 && accessGranted == false)

            {

                if (usernameArray[index] == username && passwordArray[index] == password)

                {

                    accessGranted = true;

                }

                else

                {

                    index = index + 1;

                }

            }

            if (accessGranted != true)

            {

                if (accessAttempts < 2)

                {

                    Console.WriteLine("Invalid username and/or password. Please try again.");

                }

                accessAttempts = accessAttempts + 1;

            }

        }

        if (accessGranted == true)

        {

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

        }

        else

        {

            Console.WriteLine("Sorry. Access Denied.");

        }

    }

    // .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();

    }

}

​