using System;

​

public class MyProgram

{

    private static Random random = new Random();

    public static void Main(String[] args)

    {

        // Titus Bailey 

        // 10/22/2017

        String[] userName = new String[5];

        int[] password = new int[5];

        int index;

        int index1;

        int index2;

        int userInput;

        String userInput1;

        int temp;

        for (index = 0 ; index <= 4 ; index += userName.Length)

        {

            userName[0] = (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65);

            userName[1] = (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65);

            userName[2] = (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65);

            userName[3] = (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65);

            userName[4] = (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65) + (char) (random.Next(26) + 65);

        }

        for (index = 0 ; index <= 4 ; index += password.Length)

        {

            password[0] = 123;

            password[1] = 345;

            password[2] = 456;

            password[3] = 567;

            password[4] = 678;

        }

        for (index = 0 ; index <= userName.Length - 1 ; index += 1)

        {

            Console.WriteLine(index.ToString() + "," + userName[index] + "," + password[index]);

        }

        Boolean found;

        found = false;

        Console.WriteLine("Please enter a username");

        input(out userInput1);

        index = 0;

        if (userName[index] == userInput1)

        {

            found = true;

            Console.WriteLine("Please enter a password");

            input(out userInput);

            index = password.Length - 1;

            if (password[index] == userInput)

            {

                found = true;

            }

            else

            {

                for (userInput = 0 ; userInput <= 2 ; userInput += 1)

                {

                    Console.WriteLine("Sorry please enter a valid password");

                    input(out userInput1);

                    if (password[index] == userInput)

                    {

                        found = true;

                        if (password[index] == userInput)

                        {

                            found = true;

                        }

                        else

                        {

                            for (userInput = 0 ; userInput <= 2 ; userInput += 1)

                            {

                                Console.WriteLine("Sorry please enter a valid password");

                                input(out userInput);

                                if (password[index] == userInput)

                                {

                                    found = true;

                                }

                            }

                        }

                    }

                }

            }

        }

        else

        {

            while (userName[index] != userInput1)

            {

                Console.WriteLine("Sorry please enter a valid username");

                input(out userInput1);

                if (userName[index] == userInput1)

                {

                    found = true;

                    if (password[index] == userInput)

                    {

                        found = true;

                    }

                    else

                    {

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

                        {

                            Console.WriteLine("Sorry please enter a valid password");

                            input(out userInput);

                            if (password[index] == userInput)

                            {

                                found = true;

                            }

                        }

                    }

                }

                index = index + 1;

            }

        }

        if (found)

        {

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

        }

        else

        {

            Console.WriteLine("Sorry, Acces 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();

    }

}

​