Double linked lists allow traversal in both directions by having each node store references to both the previous and next node. Circular linked lists form a loop so that the last node points back to the first node, allowing traversal of the entire list from any node. Some applications of double and circular linked lists include web browser history, undo/redo functionality, games that loop between players, and operating systems that cycle between running applications.

1. தரவ கடடடமமபடப | இரடடமட மறடறமட வடடடமமன
இமணகடகபடபடடட வரரமச
பப.மகமலடடசமர
Data Structures | Double and Circular
Linked List

2. Data Structures -
Double and Circular Linked List
Mahalakshmi P

3. What is Double Linked List?
Double linked list is a sequence of elements in which
every element has links to its previous element and
next element in the sequence.

4. Difference
● single linked list
● every node has a link to
its next node in the
sequence.
● we can traverse from one
node to another node
only in one direction
● we can not traverse back
● double linked list
● every node has a link to
its previous node and
next node.
● So, we can traverse
forward by using the
next field and can
traverse backward by
using the previous field

5. Node Structure

6. Important Points to be Remembered
● In double linked list, the first node must be always
pointed by head.
● Always the previous field of the first node must be
NULL.
● Always the next field of the last node must be
NULL.

7. Operations
At Beginning of the list
● Insertion At End of the list
At Specific location in the
list

8. Operation
At Beginning of the list
At End of the list
At Specific location in the
list
Deletion

9. Applications/Uses of doubly linked list
in real life
● Doubly linked list can be used in navigation systems
where both front and back navigation is required.
● It is used by browsers to implement backward and
forward navigation of visited web pages i.e. back and
forward button.
● It is also used by various application to implement Undo
and Redo functionality.
● It can also be used to represent deck of cards in games.
● It is also used to represent various states of a game.

10. Circular Linked List
● A circular linked list is basically a linear linked list
that may be singly or doubly.
● The only difference is that there is no any NULL
value terminating the list.
● every node points to the next node and last node
points to the first node which forms circle.
● whole node can be traversed from any node.

11. Basic structure of Circular linked list
Singly Circular linked list
Doubly Circular Linked List

12. ●Applications/Uses of Circular linked
list in real life
● Circular lists are used in applications where the
entire list is accessed one-by-one in a loop.
Example: Operating systems may use it to switch
between various running applications in a circular
loop.
● Multiplayer games uses circular list to swap between
players in a loop.

13. Reference
● https://codeforwin.org/2015/11/circular-linked-list-d
ata-structure.html
● http://btechsmartclass.com/data_structures/circular-l
inked-list.html