Create a Circular Singly Linked List in DSA C - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Circular Singly Linked List?

A Circular Singly Linked List is a linked list where the last node points back to the first node, forming a circle. There is no NULL at the end.

beginner

How do you identify the last node in a Circular Singly Linked List?

The last node is the one whose next pointer points back to the head (first node) instead of NULL.

intermediate

Why use a Circular Singly Linked List instead of a regular singly linked list?

It allows continuous traversal from any node without stopping, useful for applications like round-robin scheduling or buffering.

beginner

What is the key step when creating the first node in a Circular Singly Linked List?

The first node's next pointer must point to itself to form the circle when it is the only node.

beginner

In C, what structure is typically used to represent a node in a Circular Singly Linked List?

A struct with at least two fields: one for data (e.g., int) and one pointer to the next node.

In a Circular Singly Linked List, what does the last node's next pointer point to?

A Itself

B NULL

C The first node

D Random memory

The last node points back to the first node to form a circle.

When creating the first node in a Circular Singly Linked List, what should its next pointer be set to?

A Itself

B Random address

C The second node

D NULL

The first node points to itself to maintain the circular structure when it is alone.

Which of these is NOT a benefit of a Circular Singly Linked List?

A Useful for round-robin scheduling

B No need to check for NULL to end traversal

C Easy continuous traversal

D Faster random access to elements

Circular lists do not provide faster random access; they still require traversal.

What is the main difference between a singly linked list and a circular singly linked list?

A Circular lists have two pointers per node

B Circular lists have last node pointing to head

C Singly linked lists have no data

D Circular lists use arrays internally

The last node in a circular singly linked list points back to the head node.

In C, which keyword is used to define the node structure for a Circular Singly Linked List?

A struct

B class

C union

D typedef

The 'struct' keyword defines a node with data and a pointer to the next node.

Explain how to create the first node of a Circular Singly Linked List in C.

Think about how to make the list circular with only one node.

Describe the difference between a regular singly linked list and a circular singly linked list.

Focus on the pointer of the last node.