Traversal of Circular Linked List in DSA C - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a circular linked list?

A circular 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 know when to stop traversing a circular linked list?

You stop when you reach the starting node again after moving forward. This means you have completed one full circle.

intermediate

Why can't you use a null check to end traversal in a circular linked list?

Because the last node points back to the first node, there is no null pointer to indicate the end. You must use the starting node to stop.

beginner

Show the basic steps to traverse a circular linked list starting from head.

1. Start at head node.<br>2. Visit current node.<br>3. Move to next node.<br>4. Repeat until current node is head again.

beginner

What is the output of traversing a circular linked list with nodes 1 -> 2 -> 3 -> back to 1?

The output is: 1 -> 2 -> 3 -> (then stops because next is head again).

In a circular linked list, what does the last node point to?

A The first node

B Null

C Itself

D A random node

In a circular linked list, the last node points back to the first node to form a circle.

When traversing a circular linked list, how do you know when to stop?

A When you find a null pointer

B When you reach the head node again

C After visiting 10 nodes

D When the next node is itself

Traversal stops when the current node is the head node again, indicating a full circle.

Which of these is NOT true about circular linked lists?

A They always have a tail node pointing to null

B They can be traversed infinitely if not careful

C They have no null pointers

D They form a loop

Circular linked lists do NOT have a tail node pointing to null; the last node points to the head.

What is the first step in traversing a circular linked list?

A Reverse the list

B Find the tail node

C Check for null

D Start at the head node

Traversal always starts at the head node in a circular linked list.

If a circular linked list has nodes 5 -> 10 -> 15 -> back to 5, what is the output after one full traversal?

A 10 -> 15 -> 5

B 5 -> 10 -> 15 -> 5

C 5 -> 10 -> 15

D 15 -> 5 -> 10

Traversal prints each node once, stopping before repeating the head node.

Explain how to traverse a circular linked list and how to know when to stop.

Think about the circle formed by the list and how to avoid infinite loops.

Describe the difference between traversing a normal linked list and a circular linked list.

Focus on what marks the end of traversal in each case.