#include <stdio.h>
#include <string.h>
 
// Structure to store book details
struct Book {
    int id;
    char title[100];
    char author[100];
    float price;
};
 
int main() {
    struct Book library[100];
    int n, i, choice, searchID, found;
 
    printf("Enter number of books: ");
    scanf("%d", &n);
 
    // Input details of books
    for (i = 0; i < n; i++) {
        printf("\nEnter details of Book %d:\n", i + 1);
        printf("Book ID: ");
        scanf("%d", &library[i].id);
        getchar(); // clear newline character
 
        printf("Title: ");
        fgets(library[i].title, sizeof(library[i].title), stdin);
        library[i].title[strcspn(library[i].title, "\n")] = '\0'; // remove newline
 
        printf("Author: ");
        fgets(library[i].author, sizeof(library[i].author), stdin);
        library[i].author[strcspn(library[i].author, "\n")] = '\0';
 
        printf("Price: ");
        scanf("%f", &library[i].price);
    }
 
    do {
        printf("\n========= Library Management Menu =========\n");
        printf("1. Display all books\n");
        printf("2. Search book by ID\n");
        printf("3. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
 
        switch (choice) {
            case 1:
                printf("\n------------------- Library Books -------------------\n");
                printf("%-10s %-30s %-20s %-10s\n", "Book ID", "Title", "Author", "Price");
                printf("-----------------------------------------------------\n");
                for (i = 0; i < n; i++) {
                    printf("%-10d %-30s %-20s %-10.2f\n",
                           library[i].id, library[i].title,
                           library[i].author, library[i].price);
                }
                break;
 
            case 2:
                printf("\nEnter Book ID to search: ");
                scanf("%d", &searchID);
                found = 0;
                for (i = 0; i < n; i++) {
                    if (library[i].id == searchID) {
                        printf("\nBook Found:\n");
                        printf("ID: %d\nTitle: %s\nAuthor: %s\nPrice: %.2f\n",
                               library[i].id, library[i].title,
                               library[i].author, library[i].price);
                        found = 1;
                        break;
                    }
                }
                if (!found)
                    printf("Book with ID %d not found.\n", searchID);
                break;
 
            case 3:
                printf("\nExiting Library Management System...\n");
                break;
 
            default:
                printf("Invalid choice! Try again.\n");
        }
 
    } while (choice != 3);
 
    return 0;
}