用C语言写。 整个图书管理系统采用结构体作为基本数据结构,最终数据一定要保存到数据文件中。主函数通过switch 语句来根据用户的需求跳转到各个模块，以实现用户的需要。系统要求能进行图书信息的浏览、添加、查询、修改、删除和排序功能。基本要求: 1.图书信息的浏览:可打开数据文件，查看每本图书的图书条形码、书名、作者名、出版社、出版时间、定价、馆藏数量等。2．图书信息的添加:能够通过键盘录入图书条形码、书名、作者名、出版社、出版时间、定价、馆藏数量等，并将数据添加到数据文件中。3．图书信息的查询:(⑴)根据图书条形码查询2)根据书名查询(3）根据作者名查询（4）根据出版社查询，每种查询均列出查找到的所有条记录信息，且最下面需要显示出汇总信息，即共有多少条符合条件的记录。4.图书信息的修改:可根据图书条形码或书名查找出图书信息，输入是否要修改，若确认修改，则输入新的信息，再次确认后将修改后信息存储到文件中。5.图书信息的删除: (⑴)能够根据图书条形码除指定图书的记录(2)能够根据书名删除指定图书的记录，并将最终数据存储到文件中。6．图书信息的排序:(1)根据图书条形码排序(⑵)根据馆藏数量排序（3）根据出版时间排序，屏幕上显示排序后的所有图书信息。7.图书统计:(1)统计馆藏数量小于某个值的图书信息(2)统计出版日期早于某个值的图书信息。

很好，这是一个非常实用的项目。以下是一个简单的C语言代码示例，可以作为你的参考：

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

#define MAX_BOOKS 1000

// 图书信息结构体
typedef struct {
    char barcode[20];
    char name[50];
    char author[50];
    char publisher[50];
    char publish_date[20];
    float price;
    int amount;
} Book;

// 图书管理系统结构体
typedef struct {
    Book books[MAX_BOOKS];
    int count;
} BookManagementSystem;

// 初始化图书管理系统
void init(BookManagementSystem* system) {
    system->count = 0;
}

// 读取图书信息文件
void load_file(BookManagementSystem* system) {
    FILE* fp = fopen("book.dat", "rb");
    if (fp != NULL) {
        fread(&system->count, sizeof(int), 1, fp);
        fread(system->books, sizeof(Book), system->count, fp);
        fclose(fp);
    }
}

// 保存图书信息文件
void save_file(BookManagementSystem* system) {
    FILE* fp = fopen("book.dat", "wb");
    if (fp != NULL) {
        fwrite(&system->count, sizeof(int), 1, fp);
        fwrite(system->books, sizeof(Book), system->count, fp);
        fclose(fp);
    }
}

// 添加图书信息
void add_book(BookManagementSystem* system) {
    if (system->count >= MAX_BOOKS) {
        printf("Error: the book list is full!\n");
        return;
    }
    Book book;
    printf("Barcode: ");
    scanf("%s", book.barcode);
    printf("Name: ");
    scanf("%s", book.name);
    printf("Author: ");
    scanf("%s", book.author);
    printf("Publisher: ");
    scanf("%s", book.publisher);
    printf("Publish date: ");
    scanf("%s", book.publish_date);
    printf("Price: ");
    scanf("%f", &book.price);
    printf("Amount: ");
    scanf("%d", &book.amount);
    system->books[system->count++] = book;
    printf("Success: the book has been added!\n");
}

// 查询图书信息
void query_book(BookManagementSystem* system) {
    int type;
    char keyword[50];
    printf("Query type (1: Barcode, 2: Name, 3: Author, 4: Publisher): ");
    scanf("%d", &type);
    printf("Keyword: ");
    scanf("%s", keyword);
    int count = 0;
    for (int i = 0; i < system->count; i++) {
        Book book = system->books[i];
        char* str = NULL;
        switch (type) {
            case 1:
                str = book.barcode;
                break;
            case 2:
                str = book.name;
                break;
            case 3:
                str = book.author;
                break;
            case 4:
                str = book.publisher;
                break;
            default:
                printf("Error: invalid query type!\n");
                return;
        }
        if (strstr(str, keyword) != NULL) {
            printf("Barcode: %s\n", book.barcode);
            printf("Name: %s\n", book.name);
            printf("Author: %s\n", book.author);
            printf("Publisher: %s\n", book.publisher);
            printf("Publish date: %s\n", book.publish_date);
            printf("Price: %.2f\n", book.price);
            printf("Amount: %d\n", book.amount);
            printf("----------------------------\n");
            count++;
        }
    }
    printf("Total: %d\n", count);
}

// 修改图书信息
void modify_book(BookManagementSystem* system) {
    int type;
    char keyword[50];
    printf("Query type (1: Barcode, 2: Name): ");
    scanf("%d", &type);
    printf("Keyword: ");
    scanf("%s", keyword);
    int index = -1;
    for (int i = 0; i < system->count; i++) {
        Book book = system->books[i];
        char* str = NULL;
        switch (type) {
            case 1:
                str = book.barcode;
                break;
            case 2:
                str = book.name;
                break;
            default:
                printf("Error: invalid query type!\n");
                return;
        }
        if (strcmp(str, keyword) == 0) {
            index = i;
            break;
        }
    }
    if (index < 0) {
        printf("Error: no book found!\n");
        return;
    }
    Book book = system->books[index];
    printf("Barcode: %s\n", book.barcode);
    printf("Name: %s\n", book.name);
    printf("Author: %s\n", book.author);
    printf("Publisher: %s\n", book.publisher);
    printf("Publish date: %s\n", book.publish_date);
    printf("Price: %.2f\n", book.price);
    printf("Amount: %d\n", book.amount);
    printf("----------------------------\n");
    char confirm[10];
    printf("Do you want to modify this book? (yes or no): ");
    scanf("%s", confirm);
    if (strcmp(confirm, "yes") == 0) {
        printf("Barcode: ");
        scanf("%s", book.barcode);
        printf("Name: ");
        scanf("%s", book.name);
        printf("Author: ");
        scanf("%s", book.author);
        printf("Publisher: ");
        scanf("%s", book.publisher);
        printf("Publish date: ");
        scanf("%s", book.publish_date);
        printf("Price: ");
        scanf("%f", &book.price);
        printf("Amount: ");
        scanf("%d", &book.amount);
        system->books[index] = book;
        printf("Success: the book has been modified!\n");
    }
}

// 删除图书信息
void delete_book(BookManagementSystem* system) {
    int type;
    char keyword[50];
    printf("Query type (1: Barcode, 2: Name): ");
    scanf("%d", &type);
    printf("Keyword: ");
    scanf("%s", keyword);
    int count = 0;
    for (int i = 0; i < system->count; i++) {
        Book book = system->books[i];
        char* str = NULL;
        switch (type) {
            case 1:
                str = book.barcode;
                break;
            case 2:
                str = book.name;
                break;
            default:
                printf("Error: invalid query type!\n");
                return;
        }
        if (strcmp(str, keyword) == 0) {
            count++;
        }
    }
    if (count == 0) {
        printf("Error: no book found!\n");
        return;
    }
    Book* books = (Book*)malloc(count * sizeof(Book));
    int j = 0;
    for (int i = 0; i < system->count; i++) {
        Book book = system->books[i];
        char* str = NULL;
        switch (type) {
            case 1:
                str = book.barcode;
                break;
            case 2:
                str = book.name;
                break;
            default:
                printf("Error: invalid query type!\n");
                return;
        }
        if (strcmp(str, keyword) != 0) {
            books[j++] = book;
        }
    }
    system->count = j;
    memcpy(system->books, books, j * sizeof(Book));
    free(books);
    printf("Success: %d books have been deleted!\n", count);
}

// 排序图书信息
void sort_book(BookManagementSystem* system) {
    int type;
    printf("Sort type (1: Barcode, 2: Amount, 3: Publish date): ");
    scanf("%d", &type);
    for (int i = 0; i < system->count - 1; i++) {
        for (int j = i + 1; j < system->count; j++) {
            Book* a = &system->books[i];
            Book* b = &system->books[j];
            switch (type) {
                case 1:
                    if (strcmp(a->barcode, b->barcode) > 0) {
                        Book temp = *a;
                        *a = *b;
                        *b = temp;
                    }
                    break;
                case 2:
                    if (a->amount < b->amount) {
                        Book temp = *a;
                        *a = *b;
                        *b = temp;
                    }
                    break;
                case 3:
                    if (strcmp(a->publish_date, b->publish_date) > 0) {
                        Book temp = *a;
                        *a = *b;
                        *b = temp;
                    }
                    break;
                default:
                    printf("Error: invalid sort type!\n");
                    return;
            }
        }
    }
    printf("Success: the book list has been sorted!\n");
}

// 统计图书信息
void statistics_book(BookManagementSystem* system) {
    int type;
    printf("Statistics type (1: Amount, 2: Publish date): ");
    scanf("%d", &type);
    int count = 0;
    switch (type) {
        case 1: {
            int amount;
            printf("Amount: ");
            scanf("%d", &amount);
            for (int i = 0; i < system->count; i++) {
                if (system->books[i].amount < amount) {
                    count++;
                }
            }
            printf("Total: %d\n", count);
            break;
        }
        case 2: {
            char date[20];
            printf("Publish date: ");
            scanf("%s", date);
            for (int i = 0; i < system->count; i++) {
                if (strcmp(system->books[i].publish_date, date) < 0) {
                    count++;
                }
            }
            printf("Total: %d\n", count);
            break;
        }
        default:
            printf("Error: invalid statistics type!\n");
            return;
    }
}

// 显示菜单
void show_menu() {
    printf("Book Management System\n");
    printf("-----------------------\n");
    printf("1. Add book\n");
    printf("2. Query book\n");
    printf("3. Modify book\n");
    printf("4. Delete book\n");
    printf("5. Sort book\n");
    printf("6. Statistics book\n");
    printf("7. Exit\n");
    printf("-----------------------\n");
    printf("Please input your choice: ");
}

int main() {
    BookManagementSystem system;
    init(&system);
    load_file(&system);
    while (1) {
        show_menu();
        int choice;
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_book(&system);
                save_file(&system);
                break;
            case 2:
                query_book(&system);
                break;
            case 3:
                modify_book(&system);
                save_file(&system);
                break;
            case 4:
                delete_book(&system);
                save_file(&system);
                break;
            case 5:
                sort_book(&system);
                save_file(&system);
                break;
            case 6:
                statistics_book(&system);
                break;
            case 7:
                save_file(&system);
                exit(0);
            default:
                printf("Error: invalid choice!\n");
        }
    }
    return 0;
}

这个代码示例实现了基本的图书管理系统功能，包括添加、查询、修改、删除、排序和统计。你可以在此基础上进行扩展和优化。注意，这个示例代码并没有考虑并发和异常处理等情况，你需要进行额外的处理来保证程序的健壮性和可靠性。