Doubly Linked List (Insertion at the End)

Inserting a Node at the End of a Linked List

In this presentation, we will learn how to insert a node at the end of a linked list. The initial state of the linked list is shown, with a head pointer pointing to the first node. The goal is to add a new node at the end of this list.

Traversing the List

• To add a node at the end of the linked list, we need to traverse the list until we reach the last node.

• We use a pointer called Tp that initially points to the first node and later points to the last node.

• We can achieve this by using code like while Tp next not equal to null, Tp equal to Tp next.

Updating Pointers

• Once we have reached the last node (Tp next is null), we can proceed with adding our new node.

• We update Tp next to point to our new node, effectively adding it at the end of the list.

• We also update temp prev to point back to Tp, completing the connection for our new node.

Resultant Linked List

• After adding the new node, we have successfully inserted it at the end of our linked list.

• The head pointer still points to the first node, and now there is an additional node at the end.

Program Structure

• This program assumes that functions like "add_to_empty" and "add_at_beg" are already available from previous lectures.

• The main function calls "add_at_end" function with parameters: head (pointer) and value (data for new node).

• The "add_at_end" function receives these parameters and performs all necessary steps described earlier.

Conclusion

The process of inserting a new node at the end of a linked list involves traversing the list, updating pointers, and connecting the new node. By following these steps, we can successfully add a node to the end of a linked list.

The timestamps provided in the transcript have been used to associate relevant information with specific parts of the video.