可不可以给我一个示范性的代码

好的，这里为您提供一个示范性的代码，实现了基本的图书管理功能。代码如下：

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

// 图书结构体
typedef struct Book {
    char title[50];     // 书名
    char author[20];    // 作者
    char publisher[20]; // 出版社
    float price;        // 价格
} Book;

// 链表节点结构体
typedef struct Node {
    Book *book;         // 指向图书结构体的指针
    struct Node *next;  // 指向下一个节点的指针
} Node;

// 添加图书
void addBook(Node **head) {
    Book *book = (Book *)malloc(sizeof(Book));
    printf("请输入书名：");
    scanf("%s", book->title);
    printf("请输入作者：");
    scanf("%s", book->author);
    printf("请输入出版社：");
    scanf("%s", book->publisher);
    printf("请输入价格：");
    scanf("%f", &book->price);

    Node *newNode = (Node *)malloc(sizeof(Node));
    newNode->book = book;
    newNode->next = NULL;

    if (*head == NULL) {
        *head = newNode;
    } else {
        Node *cur = *head;
        while (cur->next != NULL) {
            cur = cur->next;
        }
        cur->next = newNode;
    }

    printf("添加成功！\n");
}

// 删除图书
void deleteBook(Node **head, char *title) {
    Node *cur = *head;
    Node *prev = NULL;

    while (cur != NULL) {
        if (strcmp(cur->book->title, title) == 0) {
            if (prev == NULL) {
                *head = cur->next;
            } else {
                prev->next = cur->next;
            }

            free(cur->book);
            free(cur);

            printf("删除成功！\n");
            return;
        }

        prev = cur;
        cur = cur->next;
    }

    printf("找不到该书！\n");
}

// 修改图书信息
void editBook(Node *head, char *title) {
    Node *cur = head;

    while (cur != NULL) {
        if (strcmp(cur->book->title, title) == 0) {
            printf("请输入新的书名（旧书名：%s）：", cur->book->title);
            scanf("%s", cur->book->title);

            printf("请输入新的作者（旧作者：%s）：", cur->book->author);
            scanf("%s", cur->book->author);

            printf("请输入新的出版社（旧出版社：%s）：", cur->book->publisher);
            scanf("%s", cur->book->publisher);

            printf("请输入新的价格（旧价格：%f）：", cur->book->price);
            scanf("%f", &cur->book->price);

            printf("修改成功！\n");
            return;
        }

        cur = cur->next;
    }

    printf("找不到该书！\n");
}

// 查找图书
void searchBook(Node *head, char *title) {
    Node *cur = head;

    while (cur != NULL) {
        if (strcmp(cur->book->title, title) == 0) {
            printf("书名：%s\n", cur->book->title);
            printf("作者：%s\n", cur->book->author);
            printf("出版社：%s\n", cur->book->publisher);
            printf("价格：%f\n", cur->book->price);
            return;
        }

        cur = cur->next;
    }

    printf("找不到该书！\n");
}

// 显示所有图书
void showAllBooks(Node *head) {
    Node *cur = head;

    while (cur != NULL) {
        printf("书名：%s\n", cur->book->title);
        printf("作者：%s\n", cur->book->author);
        printf("出版社：%s\n", cur->book->publisher);
        printf("价格：%f\n", cur->book->price);
        printf("\n");

        cur = cur->next;
    }
}

// 读取文件
void readFromFile(Node **head) {
    FILE *fp = fopen("books.txt", "r");

    if (fp == NULL) {
        printf("文件打开失败！\n");
        return;
    }

    while (!feof(fp)) {
        Book *book = (Book *)malloc(sizeof(Book));
        fscanf(fp, "%s %s %s %f", book->title, book->author, book->publisher, &book->price);

        Node *newNode = (Node *)malloc(sizeof(Node));
        newNode->book = book;
        newNode->next = NULL;

        if (*head == NULL) {
            *head = newNode;
        } else {
            Node *cur = *head;
            while (cur->next != NULL) {
                cur = cur->next;
            }
            cur->next = newNode;
        }
    }

    fclose(fp);
}

// 保存文件
void saveToFile(Node *head) {
    FILE *fp = fopen("books.txt", "w");

    if (fp == NULL) {
        printf("文件打开失败！\n");
        return;
    }

    Node *cur = head;

    while (cur != NULL) {
        fprintf(fp, "%s %s %s %f\n", cur->book->title, cur->book->author, cur->book->publisher, cur->book->price);
        cur = cur->next;
    }

    fclose(fp);
}

int main() {
    Node *head = NULL;
    int choice;
    char title[50];

    readFromFile(&head);

    while (1) {
        printf("请选择操作：\n");
        printf("1. 添加图书\n");
        printf("2. 删除图书\n");
        printf("3. 修改图书信息\n");
        printf("4. 查找图书\n");
        printf("5. 显示所有图书\n");
        printf("6. 退出\n");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                addBook(&head);
                break;
            case 2:
                printf("请输入要删除的书名：");
                scanf("%s", title);
                deleteBook(&head, title);
                break;
            case 3:
                printf("请输入要修改的书名：");
                scanf("%s", title);
                editBook(head, title);
                break;
            case 4:
                printf("请输入要查找的书名：");
                scanf("%s", title);
                searchBook(head, title);
                break;
            case 5:
                showAllBooks(head);
                break;
            case 6:
                saveToFile(head);
                exit(0);
            default:
                printf("无效的选项！\n");
                break;
        }
    }

    return 0;
}

注意，在使用该代码之前，需要在程序所在目录下创建一个名为“books.txt”的文件，用于保存图书信息。