Breaking News: Grepper is joining You.com. Read the official announcement!

Consider an existing linked list where next pointer of the last node points to the first node. If there is a singlenode, then next pointer of that node will point to itself. Now design a function to add a node before a given node. Here user will provide

isuro answered on November 20, 2023 Popularity 1/10 Helpfulness 1/10

answer Consider an existing linked list where next pointer of the last node points to the first node. If there is a singlenode, then next pointer of that node will point to itself. Now design a function to add a node before a given node. Here user will provide

Consider an existing linked list where next pointer of the last node points to the first node. If there is a singlenode, then next pointer of that node will point to itself. Now design a function to add a node before a given node. Here user will provide

Comment

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

// Node structure
struct Node {
    int data;
    struct Node* next;
};

// Function to create a new node with given data
struct Node* createNode(int newData) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    if (newNode == NULL) {
        fprintf(stderr, "Memory allocation failed.\n");
        exit(EXIT_FAILURE);
    }
    newNode->data = newData;
    newNode->next = NULL;
    return newNode;
}

// Function to add a node before a given node in a circular linked list
void addNodeBefore(struct Node** head, int newNodeData, int targetNodeData) {
    if (*head == NULL) {
        fprintf(stderr, "Error: Circular linked list is empty.\n");
        exit(EXIT_FAILURE);
    }

    struct Node* current = *head;
    struct Node* previous = NULL;

    // Traverse the circular linked list to find the target node
    do {
        if (current->data == targetNodeData) {
            // Create a new node with the given data
            struct Node* newNode = createNode(newNodeData);

            // Update pointers to insert the new node before the target node
            newNode->next = current;

            if (previous == NULL) {
                // If the target node is the head, update the head
                *head = newNode;
            } else {
                previous->next = newNode;
            }

            return; // Node added, exit the function
        }

        previous = current;
        current = current->next;

    } while (current != *head); // Continue until we reach the starting node

    // If the target node is not found
    fprintf(stderr, "Error: Target node with data %d not found.\n", targetNodeData);
    exit(EXIT_FAILURE);
}

// Function to print the elements of the circular linked list
void printList(struct Node* head) {
    struct Node* current = head;

    if (head != NULL) {
        do {
            printf("%d ", current->data);
            current = current->next;
        } while (current != head); // Continue until we reach the starting node
    }

    printf("\n");
}

// Function to free the memory allocated for the circular linked list
void freeList(struct Node* head) {
    if (head != NULL) {
        struct Node* current = head;
        struct Node* temp;

        do {
            temp = current;
            current = current->next;
            free(temp);
        } while (current != head); // Continue until we reach the starting node
    }
}

// Example usage
int main() {
    // Create a circular linked list
    struct Node* head = createNode(1);
    head->next = createNode(2);
    head->next->next = createNode(3);
    head->next->next->next = head; // Make the last node point to the first node

    // Print the original circular linked list
    printf("Original Circular Linked List: ");
    printList(head);

    // Add a node before the second node (2)
    addNodeBefore(&head, 5, 2);

    // Print the updated circular linked list
    printf("Updated Circular Linked List: ");
    printList(head);

    // Free the memory allocated for the circular linked list
    freeList(head);

    return 0;
}

Popularity 1/10 Helpfulness 1/10 Language c

Source: chat.openai.com

Tags: add c function linked-list next point points where

Link to this answer
Share Copy Link

Contributed on Nov 20 2023

isuro

0 Answers Avg Quality 2/10

Consider an existing linked list where next pointer of the last node points to the first node. If there is a singlenode, then next pointer of that node will point to itself. Now design a function to add a node before a given node. Here user will provide

Contents

More Related Answers

Consider an existing linked list where next pointer of the last node points to the first node. If there is a singlenode, then next pointer of that node will point to itself. Now design a function to add a node before a given node. Here user will provide

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.