Initial consideration: A circular version of a doubly linked list has to be implemented that is not having any sentinels that can generally supports the public behaviors of the original and new update methods. The implemented circular doubly linked list should have method called rotate () which is used to rotate the linked list counter clockwise and rotateBackward() method that can support the public behaviors of the linked list. The rotateBackward() method reverses the doubly linked list in an incremented order while changing the public behavior of the original linked list. There is no need to use the sentinel nodes which are more generally useful with linked list implementation that helps to maintain the reference of all nodes of a doubly linked list. The node in the circular version of doubly linked list maintains two references with the previous and the next node in the doubly linked list.

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Chapter 3, Problem 32C

Program Plan Intro

Initial consideration:

A circular version of a doubly linked list has to be implemented that is not having any sentinels that can generally supports the public behaviors of the original and new update methods.

The implemented circular doubly linked list should have method called rotate () which is used to rotate the linked list counter clockwise and rotateBackward() method that can support the public behaviors of the linked list.

The rotateBackward() method reverses the doubly linked list in an incremented order while changing the public behavior of the original linked list.

There is no need to use the sentinel nodes which are more generally useful with linked list implementation that helps to maintain the reference of all nodes of a doubly linked list.

The node in the circular version of doubly linked list maintains two references with the previous and the next node in the doubly linked list.

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