Linked List Questions and Answers: Practice and Solutions

Linked List: Questions and Answers
Here are a set of questions and answers on linked lists that will be helpful for
students preparing for exams or interviews. These questions cover various
aspects of linked lists, from basic concepts to advanced operations.



1. What is a Linked List?
Q: What is a linked list?
A: A linked list is a linear data structure where each element (node) contains two
parts: the data and a reference (or pointer) to the next node in the sequence. The
last node points to NULL, indicating the end of the list.



2. Types of Linked Lists
Q: What are the different types of linked lists?
A: The different types of linked lists are:

 Singly Linked List: Each node has data and a pointer to the next node.
 Doubly Linked List: Each node has data, a pointer to the next node, and a
pointer to the previous node.
 Circular Linked List: The last node points to the first node, forming a
circular structure. It can be singly or doubly circular.



3. Operations on Linked Lists
Q: What are the common operations that can be performed on linked lists?
A: The common operations on linked lists are:

 Insertion: Inserting a node at the beginning, end, or any specific position.
 Deletion: Removing a node from the beginning, end, or a specific position.
 Traversal: Visiting each node in the list.

,  Searching: Finding a node with specific data.
 Reversal: Reversing the order of nodes in the list.



4. Insertion at the Head of a Linked List
Q: How do you insert a node at the head of a linked list?
A: To insert a node at the head of a singly linked list:

1. Create a new node.
2. Set the new node's next pointer to the current head of the list.
3. Make the new node the head of the list.



5. Deletion from a Linked List
Q: How do you delete a node from the linked list?
A: To delete a node:

1. Find the node to be deleted.
2. Adjust the previous node’s next pointer to bypass the node to be deleted
(set it to the node’s next pointer).
3. Free the memory for the deleted node.



6. Search for a Node in a Linked List
Q: How can you search for a node in a linked list?
A: To search for a node:

1. Start from the head of the list.
2. Traverse each node and compare the data with the target value.
3. If the target is found, return the node; otherwise, continue until the end of
the list.