public static ADD info()
        {
            Console.Write("Enter name: ");
            ADD n = new ADD(Console.ReadLine());

            Console.Write("Enter age: ");
            ADD p = new ADD(Int32.Parse(Console.ReadLine()));

            return(n);
        }
        public static void lånbook(string numbr)
        {
            if (numbr == "1")
            {
                Console.Write("Enter name: ");
                ADD n = new ADD(Console.ReadLine());
                Console.Write("Enter age: ");
                ADD p = new ADD(Int32.Parse(Console.ReadLine()));

                if (bookList[0].available == true)
                {
                    Console.WriteLine(n + "is " + p + " and rented the book!");
                    bookList[0].available = false;
                }
                else
                {
                    Console.WriteLine("Book already rented out");
                }
            }
            else if (numbr == "2")
            {
                Console.Write("Enter name: ");
                ADD n = new ADD(Console.ReadLine());
                Console.Write("Enter age: ");
                ADD p = new ADD(Int32.Parse(Console.ReadLine()));

                if (bookList[1].available == true)
                {
                    Console.WriteLine(n + "is " + p + " and rented the book!");
                    bookList[1].available = false;
                }
                else
                {
                    Console.WriteLine("Book already rented out");
                }
            }
            else if (numbr == "3")
            {
                Console.Write("Enter name: ");
                ADD n = new ADD(Console.ReadLine());
                Console.Write("Enter age: ");
                ADD p = new ADD(Int32.Parse(Console.ReadLine()));

                if (bookList[2].available == true)
                {
                    Console.WriteLine(n + " is " + p + " and rented the book!");
                    bookList[2].available = false;
                }
                else
                {
                    Console.WriteLine("Book already rented out");
                }
            }
        }
 public static void returneerbog(string numb)
 {
     if (numb == "1")
     {
         Console.Write("Enter name: ");
         ADD n = new ADD(Console.ReadLine());
         Console.Write("Enter age: ");
         ADD p = new ADD(Int32.Parse(Console.ReadLine()));
         if (bookList[0].available == false)
         {
             bookList[0].available = true;
             Console.WriteLine(n + "is " + p + " and returned the book!" + bookList[0].bookName);
         }
         else
         {
             Console.WriteLine("Book alrdy returned");
         }
     }
     else if (numb == "2")
     {
         Console.Write("Enter name: ");
         ADD n = new ADD(Console.ReadLine());
         Console.Write("Enter age: ");
         ADD p = new ADD(Int32.Parse(Console.ReadLine()));
         if (bookList[1].available == false)
         {
             bookList[1].available = true;
             Console.WriteLine(n + "is " + p + " and returned the book!" + bookList[1].bookName);
         }
         else
         {
             Console.WriteLine("Book alrdy returned");
         }
     }
     else if (numb == "3")
     {
         Console.Write("Enter name: ");
         ADD n = new ADD(Console.ReadLine());
         Console.Write("Enter age: ");
         ADD p = new ADD(Int32.Parse(Console.ReadLine()));
         if (bookList[2].available == false)
         {
             bookList[2].available = true;
             Console.WriteLine(n + "is " + p + " and returnd the book!" + bookList[2].bookName);
         }
         else
         {
             Console.WriteLine("Book alrdy returned");
         }
     }
 }