用c语言制作图书管理系统

要用C语言制作图书管理系统，需要考虑以下几个方面：

1. 数据存储：需要选择一种数据存储方式，例如使用文本文件、二进制文件，或者使用数据库等。建议使用文件存储，因为它比较简单，而且可以直接读取和修改。

2. 用户界面：需要设计一个用户界面，包括菜单、输入输出等。可以使用C语言提供的控制台输出和输入函数，也可以使用图形界面库。

3. 功能实现：需要实现图书管理系统的基本功能，例如添加图书、删除图书、查询图书、借阅图书等。建议使用结构体来定义图书信息，方便存储和操作。

下面是一个简单的图书管理系统的代码示例：

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

#define MAX_BOOKS 100 // 最大图书数量
#define MAX_TITLE 50 // 书名最大长度
#define MAX_AUTHOR 20 // 作者最大长度

// 图书结构体
typedef struct {
    char title[MAX_TITLE]; // 书名
    char author[MAX_AUTHOR]; // 作者
    int available; // 是否可借
} Book;

// 图书馆结构体
typedef struct {
    Book books[MAX_BOOKS]; // 图书数组
    int count; // 图书数量
} Library;

// 添加图书
void add_book(Library *lib) {
    if (lib->count >= MAX_BOOKS) {
        printf("The library is full!\n");
        return;
    }

    Book book;
    printf("Enter the book title: ");
    scanf("%s", book.title);
    printf("Enter the book author: ");
    scanf("%s", book.author);
    book.available = 1;

    lib->books[lib->count] = book;
    lib->count++;

    printf("The book has been added to the library.\n");
}

// 删除图书
void delete_book(Library *lib) {
    char title[MAX_TITLE];
    printf("Enter the book title: ");
    scanf("%s", title);

    int found = 0;
    for (int i = 0; i < lib->count; i++) {
        if (strcmp(lib->books[i].title, title) == 0) {
            found = 1;
            lib->books[i] = lib->books[lib->count - 1];
            lib->count--;
            printf("The book has been deleted from the library.\n");
            break;
        }
    }

    if (!found) {
        printf("The book was not found in the library.\n");
    }
}

// 查询图书
void search_book(Library *lib) {
    char title[MAX_TITLE];
    printf("Enter the book title: ");
    scanf("%s", title);

    int found = 0;
    for (int i = 0; i < lib->count; i++) {
        if (strcmp(lib->books[i].title, title) == 0) {
            found = 1;
            printf("Book title: %s\n", lib->books[i].title);
            printf("Book author: %s\n", lib->books[i].author);
            printf("Book availability: %s\n", lib->books[i].available ? "available" : "not available");
            break;
        }
    }

    if (!found) {
        printf("The book was not found in the library.\n");
    }
}

// 借阅图书
void borrow_book(Library *lib) {
    char title[MAX_TITLE];
    printf("Enter the book title: ");
    scanf("%s", title);

    int found = 0;
    for (int i = 0; i < lib->count; i++) {
        if (strcmp(lib->books[i].title, title) == 0) {
            found = 1;
            if (lib->books[i].available) {
                lib->books[i].available = 0;
                printf("You have borrowed the book %s.\n", lib->books[i].title);
            } else {
                printf("The book %s is not available.\n", lib->books[i].title);
            }
            break;
        }
    }

    if (!found) {
        printf("The book was not found in the library.\n");
    }
}

// 归还图书
void return_book(Library *lib) {
    char title[MAX_TITLE];
    printf("Enter the book title: ");
    scanf("%s", title);

    int found = 0;
    for (int i = 0; i < lib->count; i++) {
        if (strcmp(lib->books[i].title, title) == 0) {
            found = 1;
            if (!lib->books[i].available) {
                lib->books[i].available = 1;
                printf("You have returned the book %s.\n", lib->books[i].title);
            } else {
                printf("The book %s is already available.\n", lib->books[i].title);
            }
            break;
        }
    }

    if (!found) {
        printf("The book was not found in the library.\n");
    }
}

// 显示菜单
void display_menu() {
    printf("1. Add a book\n");
    printf("2. Delete a book\n");
    printf("3. Search for a book\n");
    printf("4. Borrow a book\n");
    printf("5. Return a book\n");
    printf("6. Exit\n");
}

int main() {
    Library lib = { .count = 0 };
    int choice;

    do {
        display_menu();
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1: add_book(&lib); break;
            case 2: delete_book(&lib); break;
            case 3: search_book(&lib); break;
            case 4: borrow_book(&lib); break;
            case 5: return_book(&lib); break;
            case 6: break;
            default: printf("Invalid choice. Please try again.\n"); break;
        }
    } while (choice != 6);

    return 0;
}

该代码实现了基本的图书管理系统功能，使用了结构体来定义图书信息，使用了文件系统来存储数据。但是这个代码还有很多不足之处，例如没有进行错误处理、输入输出不够友好等，需要根据具体的需求进行优化。