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Python

Java

#include <stdio.h>
#include <stdlib.h>

typedef struct Node {
    int data;
    struct Node* next;
    struct Node* prev;
} Node;

int main() {
    Node* node1 = (Node*) malloc(sizeof(Node));
    Node* node2 = (Node*) malloc(sizeof(Node));
    Node* node3 = (Node*) malloc(sizeof(Node));
    Node* node4 = (Node*) malloc(sizeof(Node));

node1->data = 3;
    node2->data = 5;
    node3->data = 13;
    node4->data = 2;

node1->next = node2;
    node1->prev = node4;  // Circular link

node2->prev = node1;
    node2->next = node3;

node3->prev = node2;
    node3->next = node4;

node4->prev = node3;
    node4->next = node1;  // Circular link

printf("\nTraversing forward:\n");
    Node* currentNode = node1;
    Node* startNode = node1;
    printf("%d -> ", currentNode->data);
    currentNode = currentNode->next;

while (currentNode != startNode) {
        printf("%d -> ", currentNode->data);
        currentNode = currentNode->next;
    }
    printf("...\n");  // Indicating the list loops back

printf("\nTraversing backward:\n");
    currentNode = node4;
    startNode = node4;
    printf("%d -> ", currentNode->data);
    currentNode = currentNode->prev;

while (currentNode != startNode) {
        printf("%d -> ", currentNode->data);
        currentNode = currentNode->prev;
    }
    printf("...\n");  // Indicating the list loops back

free(node1);
    free(node2);
    free(node3);
    free(node4);

return 0;
}

//C

public class Main {
    static class Node {
        int data;
        Node next;
        Node prev;

Node(int data) {
            this.data = data;
        }
    }

public static void main(String[] args) {
        Node node1 = new Node(3);
        Node node2 = new Node(5);
        Node node3 = new Node(13);
        Node node4 = new Node(2);

node1.next = node2;
        node1.prev = node4;  // Circular link

node2.prev = node1;
        node2.next = node3;

node3.prev = node2;
        node3.next = node4;

node4.prev = node3;
        node4.next = node1;  // Circular link

System.out.println("\nTraversing forward:");
        Node currentNode = node1;
        Node startNode = node1;
        System.out.print(currentNode.data + " -> ");
        currentNode = currentNode.next;

while (currentNode != startNode) {
            System.out.print(currentNode.data + " -> ");
            currentNode = currentNode.next;
        }
        System.out.println("...");  // Indicating the list loops back

System.out.println("\nTraversing backward:");
        currentNode = node4;
        startNode = node4;
        System.out.print(currentNode.data + " -> ");
        currentNode = currentNode.prev;

while (currentNode != startNode) {
            System.out.print(currentNode.data + " -> ");
            currentNode = currentNode.prev;
        }
        System.out.println("...");  // Indicating the list loops back
    }
}

//Java