帮我用c语言写一个图书馆管理系统

好的，下面是一个简单的图书馆管理系统的C语言代码示例：

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

#define MAX_BOOKS 100

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

struct Library {
    struct Book books[MAX_BOOKS];
    int num_books;
};

void add_book(struct Library* library);
void remove_book(struct Library* library);
void search_book(struct Library* library);
void display_books(struct Library* library);

int main() {
    struct Library library;
    library.num_books = 0;

    int choice;
    do {
        printf("1. Add Book\n");
        printf("2. Remove Book\n");
        printf("3. Search Book\n");
        printf("4. Display Books\n");
        printf("5. Quit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_book(&library);
                break;
            case 2:
                remove_book(&library);
                break;
            case 3:
                search_book(&library);
                break;
            case 4:
                display_books(&library);
                break;
            case 5:
                printf("Goodbye!\n");
                break;
            default:
                printf("Invalid choice. Try again.\n");
        }
    } while (choice != 5);

    return 0;
}

void add_book(struct Library* library) {
    if (library->num_books >= MAX_BOOKS) {
        printf("Error: Library is full.\n");
        return;
    }

    struct Book book;
    book.id = library->num_books + 1;

    printf("Enter the book title: ");
    scanf("%s", book.title);

    printf("Enter the book author: ");
    scanf("%s", book.author);

    book.available = 1;

    library->books[library->num_books] = book;
    library->num_books++;

    printf("Book added successfully.\n");
}

void remove_book(struct Library* library) {
    int id;
    printf("Enter the book ID to remove: ");
    scanf("%d", &id);

    for (int i = 0; i < library->num_books; i++) {
        if (library->books[i].id == id) {
            for (int j = i; j < library->num_books - 1; j++) {
                library->books[j] = library->books[j + 1];
            }
            library->num_books--;
            printf("Book removed successfully.\n");
            return;
        }
    }

    printf("Error: Book not found.\n");
}

void search_book(struct Library* library) {
    char keyword[50];
    printf("Enter the search keyword: ");
    scanf("%s", keyword);

    for (int i = 0; i < library->num_books; i++) {
        if (strstr(library->books[i].title, keyword) || strstr(library->books[i].author, keyword)) {
            printf("%d. %s by %s", library->books[i].id, library->books[i].title, library->books[i].author);
            if (library->books[i].available) {
                printf(" (Available)\n");
            } else {
                printf(" (Not Available)\n");
            }
        }
    }
}

void display_books(struct Library* library) {
    printf("ID  Title                                  Author\n");
    printf("--------------------------------------------------\n");
    for (int i = 0; i < library->num_books; i++) {
        printf("%-3d %-40s %-20s", library->books[i].id, library->books[i].title, library->books[i].author);
        if (library->books[i].available) {
            printf(" (Available)\n");
        } else {
            printf(" (Not Available)\n");
        }
    }
}

这个示例代码实现了以下功能：

1. 添加图书
2. 删除图书
3. 查找图书
4. 显示所有图书
5. 退出系统

您可以根据您的具体需求修改它，并添加其他功能。