请帮我生成一个图书管理c语言代码

以下是一个简单的图书管理系统的C语言代码：

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

#define MAX_BOOKS 100

struct Book {
    char title[50];
    char author[50];
    int year;
};

struct Book books[MAX_BOOKS];
int num_books = 0;

void add_book() {
    struct Book book;
    printf("Enter book title: ");
    scanf("%s", book.title);
    printf("Enter book author: ");
    scanf("%s", book.author);
    printf("Enter book year: ");
    scanf("%d", &book.year);
    books[num_books] = book;
    num_books++;
    printf("Book added successfully.\n");
}

void print_books() {
    if (num_books == 0) {
        printf("No books in the library.\n");
        return;
    }
    printf("Books in the library:\n");
    for (int i = 0; i < num_books; i++) {
        printf("%s by %s (%d)\n", books[i].title, books[i].author, books[i].year);
    }
}

void search_book() {
    char title[50];
    printf("Enter book title: ");
    scanf("%s", title);
    for (int i = 0; i < num_books; i++) {
        if (strcmp(title, books[i].title) == 0) {
            printf("%s by %s (%d)\n", books[i].title, books[i].author, books[i].year);
            return;
        }
    }
    printf("Book not found.\n");
}

int main() {
    int choice;
    do {
        printf("1. Add book\n");
        printf("2. Print books\n");
        printf("3. Search book\n");
        printf("4. Quit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                print_books();
                break;
            case 3:
                search_book();
                break;
            case 4:
                printf("Goodbye!\n");
                break;
            default:
                printf("Invalid choice.\n");
        }
    } while (choice != 4);
    return 0;
}