Convert singly linked list into circular linked list in C++

In this tutorial, we will be discussing a program to convert a singly linked list into circular linked list.

For this we will be provided with a singly linked list. Our task is to take the elements of that list and get it converted into a circular linked list.


 Live Demo

#include <bits/stdc++.h>
//node structure of linked list
struct Node {
   int data;
   struct Node* next;
//converting singly linked list
//to circular linked list
struct Node* circular(struct Node* head){
   struct Node* start = head;
   while (head->next != NULL)
      head = head->next;
   //assigning start to the head->next node
   //if head->next points to NULL
   head->next = start;
   return start;
void push(struct Node** head, int data){
   //creation of new node
   struct Node* newNode = (struct Node*)malloc
   (sizeof(struct Node));
   //putting data in new node
   newNode->data = data;
   newNode->next = (*head);
   (*head) = newNode;
//displaying the elements of circular linked list
void print_list(struct Node* node){
   struct Node* start = node;
   while (node->next != start) {
      printf("%d ", node->data);
      node = node->next;
   printf("%d ", node->data);
int main(){
   struct Node* head = NULL;
   push(&head, 15);
   push(&head, 14);
   push(&head, 13);
   push(&head, 22);
   push(&head, 17);
   printf("Display list: \n");
   return 0;


Display list:
17 22 13 14 15

Updated on: 22-Jan-2020


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