c语言写一个单链表的图书管理系统多一些功能

好的，以下是一个使用单链表实现的图书管理系统，包含了一些额外的功能：

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

// 定义图书结构体
typedef struct book {
    char name[50];
    char author[50];
    int year;
    int stock;
    struct book *next;
} Book;

// 创建一个新的图书
Book* create_book(char name[], char author[], int year, int stock) {
    Book *new_book = (Book*)malloc(sizeof(Book));
    strcpy(new_book->name, name);
    strcpy(new_book->author, author);
    new_book->year = year;
    new_book->stock = stock;
    new_book->next = NULL;
    return new_book;
}

// 打印所有图书
void print_books(Book *head) {
    Book *cur = head;
    while (cur != NULL) {
        printf("%s, %s, %d, %d\n", cur->name, cur->author, cur->year, cur->stock);
        cur = cur->next;
    }
}

// 在链表尾部添加一个新的图书
void add_book(Book **head, Book *new_book) {
    Book *cur = *head;
    if (cur == NULL) {
        *head = new_book;
        return;
    }
    while (cur->next != NULL) {
        cur = cur->next;
    }
    cur->next = new_book;
}

// 根据图书名字查找图书
Book* find_book(Book *head, char name[]) {
    Book *cur = head;
    while (cur != NULL) {
        if (strcmp(cur->name, name) == 0) {
            return cur;
        }
        cur = cur->next;
    }
    return NULL;
}

// 根据图书名字删除图书
void remove_book(Book **head, char name[]) {
    Book *cur = *head;
    if (cur == NULL) {
        return;
    }
    if (strcmp(cur->name, name) == 0) {
        *head = cur->next;
        free(cur);
        return;
    }
    while (cur->next != NULL && strcmp(cur->next->name, name) != 0) {
        cur = cur->next;
    }
    if (cur->next != NULL) {
        Book *to_remove = cur->next;
        cur->next = to_remove->next;
        free(to_remove);
    }
}

// 借出一本图书
void borrow_book(Book **head, char name[]) {
    Book *book = find_book(*head, name);
    if (book == NULL) {
        printf("Book not found.\n");
        return;
    }
    if (book->stock <= 0) {
        printf("Book out of stock.\n");
        return;
    }
    book->stock--;
    printf("Borrowed %s successfully.\n", book->name);
}

// 归还一本图书
void return_book(Book **head, char name[]) {
    Book *book = find_book(*head, name);
    if (book == NULL) {
        printf("Book not found.\n");
        return;
    }
    book->stock++;
    printf("Returned %s successfully.\n", book->name);
}

// 主函数
int main() {
    Book *head = NULL;
    int choice;
    while (1) {
        printf("1. Add book\n");
        printf("2. Remove book\n");
        printf("3. Print books\n");
        printf("4. Borrow book\n");
        printf("5. Return book\n");
        printf("0. Quit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                {
                    char name[50], author[50];
                    int year, stock;
                    printf("Enter the name of the book: ");
                    scanf("%s", name);
                    printf("Enter the author of the book: ");
                    scanf("%s", author);
                    printf("Enter the year of publication: ");
                    scanf("%d", &year);
                    printf("Enter the stock: ");
                    scanf("%d", &stock);
                    Book *new_book = create_book(name, author, year, stock);
                    add_book(&head, new_book);
                    printf("Added %s successfully.\n", name);
                    break;
                }
            case 2:
                {
                    char name[50];
                    printf("Enter the name of the book: ");
                    scanf("%s", name);
                    remove_book(&head, name);
                    printf("Removed %s successfully.\n", name);
                    break;
                }
            case 3:
                {
                    printf("Name, Author, Year, Stock\n");
                    print_books(head);
                    break;
                }
            case 4:
                {
                    char name[50];
                    printf("Enter the name of the book: ");
                    scanf("%s", name);
                    borrow_book(&head, name);
                    break;
                }
            case 5:
                {
                    char name[50];
                    printf("Enter the name of the book: ");
                    scanf("%s", name);
                    return_book(&head, name);
                    break;
                }
            case 0:
                exit(0);
            default:
                printf("Invalid choice.\n");
        }
    }
    return 0;
}

此图书管理系统除了基本的添加、删除、打印、借阅和归还功能，还包括了以下额外功能：

1. 每本图书记录了库存信息；
2. 可以根据图书名字查找图书；
3. 借出一本图书时会检查库存是否足够，如果不够则无法借出；
4. 归还一本图书时会增加库存；
5. 可以不断执行各种操作，直到选择退出程序。