# Circular Linked List | Set 2 (Traversal)

We have discussed Circular Linked List Introduction and Applications, in the previous post on Circular Linked List. In this post, traversal operation is discussed. In a conventional linked list, we traverse the list from the head node and stop the traversal when we reach NULL. In a circular linked list, we stop traversal when we reach the first node again. Following is C code for linked list traversal.

 `/* Function to traverse a given Circular linked list and print nodes */` `void` `printList(``struct` `Node *first) ` `{ ` `    ``struct` `Node *temp = first;  ` ` `  `    ``// If linked list is not empty ` `    ``if` `(first != NULL)  ` `    ``{ ` `        ``// Keep printing nodes till we reach the first node again ` `        ``do` `        ``{ ` `            ``printf``(``"%d "``, temp->data); ` `            ``temp = temp->next; ` `        ``} ` `        ``while` `(temp != first); ` `    ``} ` `} `

Complete program to demonstrate traversal. Following are complete programs to demonstrate traversal of circular linked list.

## C++

 `// C++ program to implement  ` `// the above approach  ` `#include ` `using` `namespace` `std; ` ` `  `/* structure for a node */` `class` `Node  ` `{  ` `    ``public``: ` `    ``int` `data;  ` `    ``Node *next;  ` `};  ` ` `  `/* Function to insert a node at the begining  ` `of a Circular linked list */` `void` `push(Node **head_ref, ``int` `data)  ` `{  ` `    ``Node *ptr1 = ``new` `Node(); ` `    ``Node *temp = *head_ref;  ` `    ``ptr1->data = data;  ` `    ``ptr1->next = *head_ref;  ` ` `  `    ``/* If linked list is not NULL then  ` `    ``set the next of last node */` `    ``if` `(*head_ref != NULL)  ` `    ``{  ` `        ``while` `(temp->next != *head_ref)  ` `            ``temp = temp->next;  ` `        ``temp->next = ptr1;  ` `    ``}  ` `    ``else` `        ``ptr1->next = ptr1; ``/*For the first node */` ` `  `    ``*head_ref = ptr1;  ` `}  ` ` `  `/* Function to print nodes in  ` `a given Circular linked list */` `void` `printList(Node *head)  ` `{  ` `    ``Node *temp = head;  ` `    ``if` `(head != NULL)  ` `    ``{  ` `        ``do` `        ``{  ` `            ``cout << temp->data << ``" "``;  ` `            ``temp = temp->next;  ` `        ``}  ` `        ``while` `(temp != head);  ` `    ``}  ` `}  ` ` `  `/* Driver program to test above functions */` `int` `main()  ` `{  ` `    ``/* Initialize lists as empty */` `    ``Node *head = NULL;  ` ` `  `    ``/* Created linked list will be 11->2->56->12 */` `    ``push(&head, 12);  ` `    ``push(&head, 56);  ` `    ``push(&head, 2);  ` `    ``push(&head, 11);  ` ` `  `    ``cout << ````"Contents of Circular Linked List "````;  ` `    ``printList(head);  ` ` `  `    ``return` `0;  ` `}  ` ` `  `// This is code is contributed by rathbhupendra `

/div>

## C

 `// C program to implement ` `// the above approach ` `#include ` `#include ` ` `  `/* structure for a node */` `struct` `Node ` `{ ` `    ``int` `data; ` `    ``struct` `Node *next; ` `}; ` ` `  `/* Function to insert a node at the begining of a Circular ` `   ``linked list */` `void` `push(``struct` `Node **head_ref, ``int` `data) ` `{ ` `    ``struct` `Node *ptr1 = (``struct` `Node *)``malloc``(``sizeof``(``struct` `Node)); ` `    ``struct` `Node *temp = *head_ref; ` `    ``ptr1->data = data; ` `    ``ptr1->next = *head_ref; ` ` `  `    ``/* If linked list is not NULL then set the next of last node */` `    ``if` `(*head_ref != NULL) ` `    ``{ ` `        ``while` `(temp->next != *head_ref) ` `            ``temp = temp->next; ` `        ``temp->next = ptr1; ` `    ``} ` `    ``else` `        ``ptr1->next = ptr1; ``/*For the first node */` ` `  `    ``*head_ref = ptr1; ` `} ` ` `  `/* Function to print nodes in a given Circular linked list */` `void` `printList(``struct` `Node *head) ` `{ ` `    ``struct` `Node *temp = head; ` `    ``if` `(head != NULL) ` `    ``{ ` `        ``do` `        ``{ ` `            ``printf``(``"%d "``, temp->data); ` `            ``temp = temp->next; ` `        ``} ` `        ``while` `(temp != head); ` `    ``} ` `} ` ` `  `/* Driver program to test above functions */` `int` `main() ` `{ ` `    ``/* Initialize lists as empty */` `    ``struct` `Node *head = NULL; ` ` `  `    ``/* Created linked list will be 11->2->56->12 */` `    ``push(&head, 12); ` `    ``push(&head, 56); ` `    ``push(&head, 2); ` `    ``push(&head, 11); ` ` `  `    ``printf``(````"Contents of Circular Linked List "````); ` `    ``printList(head); ` ` `  `    ``return` `0; ` `} `

## Java

 `// Java program to implement ` `// the above approach ` `class` `GFG ` `{ ` ` `  `// node  ` `static` `class` `Node ` `{ ` `    ``int` `data; ` `    ``Node next; ` `}; ` ` `  `/* Function to insert a node ` `at the begining of a Circular ` `linked list */` `static` `Node push(Node head_ref,  ` `                 ``int` `data) ` `{ ` `    ``Node ptr1 = ``new` `Node(); ` `    ``Node temp = head_ref; ` `    ``ptr1.data = data; ` `    ``ptr1.next = head_ref; ` ` `  `    ``/* If linked list is not null  ` `    ``then set the next of last node */` `    ``if` `(head_ref != ``null``) ` `    ``{ ` `        ``while` `(temp.next != head_ref) ` `            ``temp = temp.next; ` `        ``temp.next = ptr1; ` `    ``} ` `    ``else` `        ``ptr1.next = ptr1;  ` ` `  `    ``head_ref = ptr1; ` `     `  `    ``return` `head_ref; ` `} ` ` `  `/* Function to print nodes in a  ` `given Circular linked list */` `static` `void` `printList(Node head) ` `{ ` `    ``Node temp = head; ` `    ``if` `(head != ``null``) ` `    ``{ ` `        ``do` `        ``{ ` `            ``System.out.print(temp.data + ``" "``); ` `            ``temp = temp.next; ` `        ``} ` `        ``while` `(temp != head); ` `    ``} ` `} ` ` `  `// Driver Code ` `public` `static` `void` `main(String args[]) ` `{ ` `    ``/* Initialize lists as empty */` `    ``Node head = ``null``; ` ` `  `    ``/* Created linked list will ` `       ``be 11.2.56.12 */` `    ``head = push(head, ``12``); ` `    ``head = push(head, ``56``); ` `    ``head = push(head, ``2``); ` `    ``head = push(head, ``11``); ` ` `  `    ``System.out.println(``"Contents of Circular "` `+  ` `                                ``"Linked List:"``); ` `    ``printList(head); ` `} ` `} ` ` `  `// This code is contributed ` `// by Arnab Kundu `

## Python

 `# Python program to demonstrate  ` `# circular linked list traversal  ` ` `  `# Structure for a Node ` `class` `Node: ` `     `  `    ``# Constructor to create  a new node ` `    ``def` `__init__(``self``, data): ` `        ``self``.data ``=` `data  ` `        ``self``.``next` `=` `None` ` `  `class` `CircularLinkedList: ` `     `  `    ``# Constructor to create a empty circular linked list ` `    ``def` `__init__(``self``): ` `        ``self``.head ``=` `None` ` `  `    ``# Function to insert a node at the beginning of a ` `    ``# circular linked list ` `    ``def` `push(``self``, data): ` `        ``ptr1 ``=` `Node(data) ` `        ``temp ``=` `self``.head ` `         `  `        ``ptr1.``next` `=` `self``.head ` ` `  `        ``# If linked list is not None then set the next of ` `        ``# last node ` `        ``if` `self``.head ``is` `not` `None``: ` `            ``while``(temp.``next` `!``=` `self``.head): ` `                ``temp ``=` `temp.``next`  `            ``temp.``next` `=` `ptr1 ` ` `  `        ``else``: ` `            ``ptr1.``next` `=` `ptr1 ``# For the first node ` ` `  `        ``self``.head ``=` `ptr1  ` ` `  `    ``# Function to print nodes in a given circular linked list ` `    ``def` `printList(``self``): ` `        ``temp ``=` `self``.head ` `        ``if` `self``.head ``is` `not` `None``: ` `            ``while``(``True``): ` `                ``print` `"%d"` `%``(temp.data), ` `                ``temp ``=` `temp.``next` `                ``if` `(temp ``=``=` `self``.head): ` `                    ``break`  ` `  ` `  `# Driver program to test above function ` ` `  `# Initialize list as empty ` `cllist ``=` `CircularLinkedList() ` ` `  `# Created linked list will be 11->2->56->12 ` `cllist.push(``12``) ` `cllist.push(``56``) ` `cllist.push(``2``) ` `cllist.push(``11``) ` ` `  `print` `"Contents of circular Linked List"` `cllist.printList() ` `           `  `# This code is contributed by  ` `# Nikhil Kumar Singh(nickzuck_007) `

## C#

 `// C# program to implement  ` `// the above approach  ` `using` `System; ` `class` `GFG  ` `{  ` ` `  `// node  ` `class` `Node  ` `{  ` `    ``public` `int` `data;  ` `    ``public` `Node next;  ` `};  ` ` `  `/* Function to insert a node  ` `at the begining of a Circular  ` `linked list */` `static` `Node push(Node head_ref,  ` `                ``int` `data)  ` `{  ` `    ``Node ptr1 = ``new` `Node();  ` `    ``Node temp = head_ref;  ` `    ``ptr1.data = data;  ` `    ``ptr1.next = head_ref;  ` ` `  `    ``/* If linked list is not null  ` `    ``then set the next of last node */` `    ``if` `(head_ref != ``null``)  ` `    ``{  ` `        ``while` `(temp.next != head_ref)  ` `            ``temp = temp.next;  ` `        ``temp.next = ptr1;  ` `    ``}  ` `    ``else` `        ``ptr1.next = ptr1;  ` ` `  `    ``head_ref = ptr1;  ` `     `  `    ``return` `head_ref;  ` `}  ` ` `  `/* Function to print nodes in a  ` `given Circular linked list */` `static` `void` `printList(Node head)  ` `{  ` `    ``Node temp = head;  ` `    ``if` `(head != ``null``)  ` `    ``{  ` `        ``do` `        ``{  ` `            ``Console.Write(temp.data + ``" "``);  ` `            ``temp = temp.next;  ` `        ``}  ` `        ``while` `(temp != head);  ` `    ``}  ` `}  ` ` `  `// Driver Code  ` `static` `public` `void` `Main(String []args)  ` `{  ` `    ``/* Initialize lists as empty */` `    ``Node head = ``null``;  ` ` `  `    ``/* Created linked list will  ` `    ``be 11.2.56.12 */` `    ``head = push(head, 12);  ` `    ``head = push(head, 56);  ` `    ``head = push(head, 2);  ` `    ``head = push(head, 11);  ` ` `  `    ``Console.WriteLine(``"Contents of Circular "` `+  ` `                                ``"Linked List:"``);  ` `    ``printList(head);  ` `}  ` `}  ` ` `  `// This code is contributed  ` `// by Arnab Kundu  `

Output:

```Contents of Circular Linked List
11 2 56 12
```

You may like to see following posts on Circular Linked List
Split a Circular Linked List into two halves
Sorted insert for circular linked list

We will soon be discussing implementation of insert delete operations for circular linked lists.

Please write comments if you find any bug in above code/algorithm, or find other ways to solve the same problem