public static void driver()
        {
            QueueUsingStacks3_5 queue = new QueueUsingStacks3_5();
            for (int i = 0; i < 10; i++)
                queue.Enqueue(i);

            while (!queue.IsEmpty())
                Console.Write("{0} ", queue.Dequeue());
        }
        public static void driver()
        {
            QueueUsingStacks3_5 queue = new QueueUsingStacks3_5();

            for (int i = 0; i < 10; i++)
            {
                queue.Enqueue(i);
            }

            while (!queue.IsEmpty())
            {
                Console.Write("{0} ", queue.Dequeue());
            }
        }