Browser Navigation Simulation using Doubly Linked List

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

// Define node
struct Node {
    char url[100];
    struct Node* prev;
    struct Node* next;
};

struct Node* current = NULL;  // Current page

// Visit a new page
void visitNewPage(char url[]) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    strcpy(newNode->url, url);
    newNode->prev = current;
    newNode->next = NULL;

    if (current != NULL) {
        current->next = newNode;
    }

    current = newNode;
    printf("Visited: %s\n", current->url);
}

// Go back to previous page
void goBack() {
    if (current == NULL || current->prev == NULL) {
        printf("Cannot go back. No previous page.\n");
    } else {
        current = current->prev;
        printf("Moved back to: %s\n", current->url);
    }
}

// Go forward to next page
void goForward() {
    if (current == NULL || current->next == NULL) {
        printf("Cannot go forward. No next page.\n");
    } else {
        current = current->next;
        printf("Moved forward to: %s\n", current->url);
    }
}

// Display current page
void displayCurrentPage() {
    if (current == NULL) {
        printf("No page visited yet.\n");
    } else {
        printf("Current Page: %s\n", current->url);
    }
}

int main() {
    int choice;
    char url[100];

    do {
        printf("\nMenu\n----\n");
        printf("1. Visit New Page\n");
        printf("2. Go Back\n");
        printf("3. Go Forward\n");
        printf("4. Display Current Page\n");
        printf("5. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        getchar(); // to consume newline after scanf

        switch(choice) {
            case 1:
                printf("Enter URL to visit: ");
                fgets(url,100,stdin);  // gets() is simple but unsafe; better use fgets() in practice
                visitNewPage(url);
                break;
            case 2:
                goBack();
                break;
            case 3:
                goForward();
                break;
            case 4:
                displayCurrentPage();
                break;
            case 5:
                printf("Exiting Browser Simulation.\n");
                break;
            default:
                printf("Invalid choice.\n");
        }
    } while(choice != 5);

    return 0;
}

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