public void VoegUSBToe(USB usb)
        {
            bool bToegevoegd = false;

            for (int i = 0; i < USBS.Length; i++)
            {
                if (USBS[i] == null)
                {
                    USBS[i]     = usb;
                    bToegevoegd = true;
                    break;
                }
            }
            if (!bToegevoegd)
            {
                Console.WriteLine("AGP slots zitten vol");
            }
        }
        static void Main(string[] args)
        {
            List <string> Oefeningen = new List <string>();

            Console.OutputEncoding = Encoding.UTF8; // voor de euro sign
            Oefeningen             = new List <string>();
            Oefeningen.Add("Exit");
            Oefeningen.Add("UML Diagrammen");
            Oefeningen.Add("Politiek");
            Oefeningen.Add("Moederbord");
            Oefeningen.Add("Een eigen huis");
            Oefeningen.Add("RPG");

            bool bExit = false;

            while (!bExit)
            {
                Console.Clear();
                Console.WriteLine("Overerving oefeningen:\n");
                switch (SelectMenu(false, Oefeningen.ToArray()) - 1)
                {
                case 0: bExit = true; break;

                case 1: UMLDiagrammen(); break;

                case 2: Politiek(); break;

                case 3: Moederbord(); break;

                case 4: EenEigenHuis(); break;

                case 5: RPG(); break;

                default:
                    break;
                }
            }

            void UMLDiagrammen()
            {
                Console.Clear();
                Console.WriteLine("UML Diagrammen:");
                Console.WriteLine("-> Bekijk klassen Persoon & Engine voor de opbouw voor deze oefening");
                Console.ReadKey();
            }

            void Politiek()
            {
                Console.Clear();
                Console.WriteLine("Politiek (was het maar zo eenvoudig):");

                List <Minister> ministers = new List <Minister>();

                ministers.Add(new Minister("Minister 1"));
                ministers.Add(new Minister("Minister 2"));
                ministers.Add(new Minister("Minister 3"));
                ministers.Add(new Minister("Minister 4"));
                ministers.Add(new Minister("Minister 5"));
                ministers.Add(new Minister("Minister 6"));
                President newPresident = new President("President");
                Land      belgium      = new Land("Belgium");

                belgium.MaakRegering(newPresident, ministers);

                Console.WriteLine("Huidige president");
                Console.WriteLine(belgium.President.Naam);
                Console.WriteLine("Huidige Eerste minister:");
                Console.WriteLine(belgium.EersteMinister.Naam);
                Console.WriteLine("Huidige ministers");
                foreach (Minister minister in belgium.ministers)
                {
                    Console.WriteLine(belgium.ministers.IndexOf(minister) + 1 + ": " + minister.Naam);
                }
                Console.ReadKey();
            }

            void Moederbord()
            {
                Moederbord Z390E_Gaming = new Moederbord();
                Ram        ddr3         = new Ram("DDR 3");
                AGP        agp          = new AGP("GeForce 2");
                USB        muis         = new USB("Logitech muis");
                USB        toetsenbord  = new USB("Logitech toetsenbord");
                PCI        geluidskaart = new PCI("Creative");

                Z390E_Gaming.cpu = new CPU("Intel");
                Z390E_Gaming.VoegRamToe(ddr3);
                Z390E_Gaming.VoegRamToe(ddr3);
                Z390E_Gaming.VoegRamToe(ddr3);
                Z390E_Gaming.VoegAGPToe(agp);
                Z390E_Gaming.VoegUSBToe(muis);
                Z390E_Gaming.VoegUSBToe(toetsenbord);
                Z390E_Gaming.VoegPCIToe(geluidskaart);
                Z390E_Gaming.TestMoederbord();

                Console.ReadKey();
            }

            void EenEigenHuis()
            {
                List <Kamer> mijnKamers = new List <Kamer>();

                mijnKamers.Add(new Badkamer("badkamer", 40));
                mijnKamers.Add(new Salon("Salon", 50));
                mijnKamers.Add(new Kamer("Slaapkamer 1", 30));
                mijnKamers.Add(new Kamer("Slaapkamer 2", 20));
                mijnKamers.Add(new Gang("Gang 1", 30));
                mijnKamers.Add(new Gang("Gang 2", 10));
                Huis mijnHuis = new Huis(mijnKamers);

                Console.WriteLine("\tHuis bevat volgende kamers:\n");
                Console.WriteLine(string.Format("\t{0,-7} {1,-5}: {2,-16} {3,3} {4,-5}", "Klassen", "Index", "Naam", "Opp.", "Prijs"));
                foreach (Kamer kamer in mijnHuis.Kamers)
                {
                    string[] type = kamer.GetType().ToString().Split('.');
                    string   msg  = string.Format("\t{4,-10} {0,2}: {1,-15} {2,3}m² {3,-5:0.0}€"
                                                  , mijnHuis.Kamers.IndexOf(kamer) + 1, kamer.Naam, kamer.Oppervlakte, kamer.Prijs, type[1]);
                    Console.WriteLine(msg);
                }
                Console.WriteLine(string.Format("\t{0,35}:{1,6:0.0}€", "Totaal prijs", mijnHuis.BerekenPrijs()));
                Console.ReadKey();
            }

            void RPG()
            {
                List <string> dungeonNames = new List <string>();

                dungeonNames = new List <string>();

                //Console.WriteLine("Player rolls");
                Player[] players = new Player[5];
                for (int i = 0; i < players.GetLength(0); i++)
                {
                    players[i] = new Player("Player " + (i + 1));
                    Console.WriteLine(players[i].ShowFullStats());;
                }

                //Console.WriteLine("\nMonster rolls");

                Monster[] monsters = new Monster[5];
                for (int i = 0; i < monsters.GetLength(0); i++)
                {
                    monsters[i] = new Monster("Monster " + (i + 1), i + 1);
                    Console.WriteLine(monsters[i].ShowFullStats());
                }

                //Console.WriteLine("\nDungeon rolls");

                Room[] rooms = new Room[5];
                for (int i = 0; i < rooms.GetLength(0); i++)
                {
                    rooms[i] = new Small_Room("Room " + (i + 1), i + 1);
                    dungeonNames.Add(rooms[i].ShowFullStats());
                }
                bool   rpgExit = false;
                int    iDungeon;
                Rnd    rnd         = new Rnd(1, 5);
                Player player      = new Player();
                Room   currentRoom = new Room();

                currentRoom = null;
                player      = null;
                int    playerRoll = -1;
                string playerNaam = null;

                while (!rpgExit)
                {
                    Console.Clear();
                    if (playerRoll != -1)
                    {
                        players[playerRoll - 1].Naam = playerNaam;
                        player = players[playerRoll - 1];
                    }
                    if (player != null)
                    {
                        player.ShowFullStats(true);
                    }
                    Console.WriteLine("\nWelkom bij: R(andom) Playing Game\n");
                    if (playerNaam == null)
                    {
                        playerNaam = InputStr("Uw naam: ");
                        Console.Write("Your roll (press a key):");
                        Console.ReadKey(true);
                        Console.WriteLine(playerRoll = rnd.RandomNumber());
                    }
                    else
                    {
                        Console.WriteLine("Lang, lang geleden was er eens ...");
                        Console.ReadKey(true);
                        Console.WriteLine("een dungeon! Vol rommel.\n");
                        Console.WriteLine("Welke dungeon wil je verkennen?\n");
                        dungeonNames.Add("Exit");
                        iDungeon = SelectMenu(false, dungeonNames.ToArray());
                        switch (iDungeon)
                        {
                        case 1: break;

                        case 2: break;

                        case 3: break;

                        case 4: break;

                        case 5: break;

                        case 6: rpgExit = true; break;

                        default:
                            break;
                        }
                        if (!rpgExit)
                        {
                            currentRoom = rooms[iDungeon - 1];
                            currentRoom.ShowFullStats(true);
                            Console.ReadKey(true);
                        }
                    }

                    //Console.ReadKey(true);
                }

                Console.ReadKey();
            }

            int SelectMenu(bool clearScreen = true, params string[] menu)
            {
                int          selection           = 1;
                int          cursTop             = Console.CursorTop;
                int          cursLeft            = Console.CursorLeft;
                bool         selected            = false;
                ConsoleColor selectionForeground = Console.BackgroundColor;
                ConsoleColor selectionBackground = Console.ForegroundColor;

                if (clearScreen)
                {
                    Console.SetCursorPosition(0, 0);
                    Console.Clear();
                }
                else
                {
                    cursTop  = Console.CursorTop;
                    cursLeft = Console.CursorLeft;
                    Console.SetCursorPosition(cursLeft, cursTop);
                }
                Console.CursorVisible = false;

                while (!selected)
                {
                    for (int i = 0; i < menu.Length; i++)
                    {
                        if (selection == i + 1)
                        {
                            Console.ForegroundColor = selectionForeground;
                            Console.BackgroundColor = selectionBackground;
                        }
                        Console.WriteLine(string.Format("{0,5}:{1,-40}", i + 1, menu[i]));
                        Console.ResetColor();
                    }
                    switch (Console.ReadKey(true).Key)
                    {
                    case ConsoleKey.UpArrow:
                        selection--;
                        break;

                    case ConsoleKey.DownArrow:
                        selection++;
                        break;

                    case ConsoleKey.Enter:
                        selected = true;
                        break;

                    case ConsoleKey.D1:
                    case ConsoleKey.NumPad1: selection = 1; break;

                    case ConsoleKey.D2:
                    case ConsoleKey.NumPad2: selection = 2; break;

                    case ConsoleKey.D3:
                    case ConsoleKey.NumPad3: selection = 3 <= menu.Length ? 3 : menu.Length; break;

                    case ConsoleKey.D4:
                    case ConsoleKey.NumPad4: selection = 4 <= menu.Length ? 4 : menu.Length; break;
                    }
                    selection = Math.Min(Math.Max(selection, 1), menu.Length);
                    if (clearScreen)
                    {
                        Console.SetCursorPosition(0, 0);
                    }
                    else
                    {
                        Console.SetCursorPosition(cursLeft, cursTop);
                    }
                }
                Console.Clear();
                Console.CursorVisible = true;
                return(selection);
            }

            string InputStrFormat(string inputFormat = "  :    :    :", int fixedLength = 14, char charStart = '0', char charEnd = '9')
            {
                string toReturn = inputFormat;
                bool   exit     = false;
                int    cursX    = Console.CursorLeft;
                int    cursY    = Console.CursorTop;
                int    count    = 0;

                foreach (char c in toReturn)
                {
                    if (c == ' ')
                    {
                    }
                }
                while ((toReturn.Length < fixedLength) && (!exit))
                {
                    Console.CursorLeft = cursX;
                    Console.CursorTop  = cursY;
                    Console.WriteLine(toReturn, fixedLength);
                    char input = Console.ReadKey(true).KeyChar;
                    if ((input >= charStart) && (input <= charEnd))
                    {
                        //toReturn[0] = input;
                    }
                }

                return(toReturn);
            }

            char InputChr(params string[] tekst)
            {
                for (int i = 0; i < tekst.GetLength(0); i++)
                {
                    Console.WriteLine(tekst[i]);
                }
                return(Console.ReadKey(true).KeyChar);
            }

            string InputStr(params string[] tekst)
            {
                for (int i = 0; i < tekst.GetLength(0); i++)
                {
                    if (tekst.GetLength(0) == 1)
                    {
                        Console.Write(tekst[i]);
                    }
                    else
                    {
                        Console.WriteLine(tekst[i]);
                    }
                }
                return(Console.ReadLine());
            }

            bool InputBool(string tekst = "j/n", bool Cyes = true, bool Cno = false)
            {
                Console.WriteLine(tekst);
                switch (Char.ToLower(Console.ReadKey(true).KeyChar))
                {
                case 'y':
                case 'j': return(Cyes);

                case 'n': return(Cno);
                }
                return(false);
            }

            int InputInt(string tekst = "Getal: ")
            {
                Console.Write(tekst);
                return(int.Parse(Console.ReadLine()));
            }

            double InputDbl(string tekst = "Getal: ")
            {
                Console.Write(tekst);
                return(double.Parse(Console.ReadLine()));
            }
        }