So after the Introduction to Data Struct materials done, we continue to Linked List II materials, there are three general points we will discuss 1. Single Linked List 2. Double Linked List 3. Circular Doubly Linked List Because Single and Double Linked List have been discuss before, we only discuss third point. So circular Doubly Linked List is combination between Single and Double, also there is something new that each of Head or Tail is pointing to zero. also there is a Insertion and Deletion: Insertion: There is nothing condition to pay attention when inserting. Deletion: There is four condition that we should attention with that node to be delete... 1. is the only Linked List 2. is the Head 3. is the Tail 4. is not a head or tail.