用C语言帮我写一个图书管理系统的代码

好的，下面是一个简单的图书管理系统的C语言代码，仅供参考：

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

#define MAX_BOOKS 100

struct Book {
    int id;
    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);
    book.id = num_books + 1;
    books[num_books++] = book;
    printf("Book added successfully.\n");
}

void list_books() {
    printf("ID  TITLE                         AUTHOR                       YEAR\n");
    printf("--------------------------------------------------------------------\n");
    for (int i = 0; i < num_books; ++i) {
        printf("%-4d%-30s%-30s%-4d\n", books[i].id, books[i].title, books[i].author, books[i].year);
    }
}

void search_books() {
    char query[50];
    printf("Enter search query: ");
    scanf("%s", query);
    printf("ID  TITLE                         AUTHOR                       YEAR\n");
    printf("--------------------------------------------------------------------\n");
    for (int i = 0; i < num_books; ++i) {
        if (strstr(books[i].title, query) || strstr(books[i].author, query)) {
            printf("%-4d%-30s%-30s%-4d\n", books[i].id, books[i].title, books[i].author, books[i].year);
        }
    }
}

int main() {
    int choice;
    while (1) {
        printf("\n");
        printf("1. Add book\n");
        printf("2. List books\n");
        printf("3. Search books\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                list_books();
                break;
            case 3:
                search_books();
                break;
            case 4:
                printf("Goodbye!\n");
                return 0;
            default:
                printf("Invalid choice. Please try again.\n");
        }
    }
    return 0;
}

这个代码实现了一个简单的图书管理系统，可以添加、列出和搜索图书。你可以根据自己的需求进行修改和扩展。