public class CircularQueue
        {
            private Int32 count ;
            private Int32 length;
            private Int32 font;
            private Int32 rear;

            private Int32[] elements;
            public CircularQueue()
            {
                elements = new Int32[16];
                length = 0;
                font = 0;
                rear = 0;
                count = 16;
            }

            public CircularQueue(Int32 c)
            {
                elements = new Int32[c];
                length = 0;
                font = 0;
                rear = 0;
                count = c;
            }

            public Int32 Lenght
            {
                get
                {
                    return length;
                }
            }

            public Boolean EnQueue(Int32 i)
            {
                if (length == count)
                    return false;

                if (length == 0)
                {
                    elements[font] = i;
                    length++;
                }
                else
                {
                    rear++;
                    length++;
                    if (rear == count)
                        rear = 0;

                    elements[rear] = i;
                }

                return true;
            }

            public Int32 DeQueue()
            {
                length--;
                Int32 i = elements[rear];
                rear--;
                if (rear == -1)
                    rear = count - 1;

                return i;
            }

            public Boolean IsEmpty()
            {
                if (length == 0)
                    return true;
                else
                    return false;
            }

            public Boolean IsFull()
            {
                if (length == count)
                    return true;
                else
                    return false;
            }
        }
        static void Main(string[] args)
        {

            CircularQueue cq = new CircularQueue();

            for (Int32 i = 0; i < 16; i++)
            {
                if(!cq.IsFull())
                    cq.EnQueue(i);
            }

            cq.DeQueue();

            if (!cq.IsFull())
                cq.EnQueue(16);

            cq.DeQueue();

            if (!cq.IsFull())
                cq.EnQueue(17);

            while(!cq.IsEmpty())
                Console.WriteLine(cq.DeQueue());
        }