c语言设计一个图书管理系统,其中包括管理员可以查看用户的账号,姓名,性别,和借阅的书籍数量,用户可以借阅归还书籍.并给出代码

以下是一个简单的图书管理系统的C语言代码实现，包括管理员和用户的操作：

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

#define MAX_USERS 100
#define MAX_BOOKS 100

struct Book {
    char name[100];
    char author[100];
    int quantity;
};

struct User {
    char id[100];
    char name[100];
    char gender[10];
    int borrowed;
    struct Book *books[10];
};

struct Book books[MAX_BOOKS];
struct User users[MAX_USERS];
int num_books = 0;
int num_users = 0;

void add_book() {
    struct Book book;
    printf("Enter book name: ");
    scanf("%s", book.name);
    printf("Enter author name: ");
    scanf("%s", book.author);
    printf("Enter quantity: ");
    scanf("%d", &book.quantity);
    books[num_books++] = book;
    printf("Book added successfully.\n");
}

void view_books() {
    printf("List of books:\n");
    for (int i = 0; i < num_books; i++) {
        printf("%d. %s by %s (%d)\n", i+1, books[i].name, books[i].author, books[i].quantity);
    }
}

void add_user() {
    struct User user;
    printf("Enter user ID: ");
    scanf("%s", user.id);
    printf("Enter user name: ");
    scanf("%s", user.name);
    printf("Enter gender: ");
    scanf("%s", user.gender);
    user.borrowed = 0;
    users[num_users++] = user;
    printf("User added successfully.\n");
}

void view_users() {
    printf("List of users:\n");
    for (int i = 0; i < num_users; i++) {
        printf("%d. %s (%s, borrowed %d books)\n", i+1, users[i].name, users[i].gender, users[i].borrowed);
    }
}

int find_user(char *id) {
    for (int i = 0; i < num_users; i++) {
        if (strcmp(users[i].id, id) == 0) {
            return i;
        }
    }
    return -1;
}

void borrow_book() {
    char id[100], book_name[100];
    printf("Enter user ID: ");
    scanf("%s", id);
    int user_index = find_user(id);
    if (user_index == -1) {
        printf("User not found.\n");
        return;
    }
    printf("Enter book name: ");
    scanf("%s", book_name);
    int book_index = -1;
    for (int i = 0; i < num_books; i++) {
        if (strcmp(books[i].name, book_name) == 0) {
            book_index = i;
            break;
        }
    }
    if (book_index == -1) {
        printf("Book not found.\n");
        return;
    }
    if (books[book_index].quantity == 0) {
        printf("No copies of this book available.\n");
        return;
    }
    books[book_index].quantity--;
    users[user_index].books[users[user_index].borrowed++] = &books[book_index];
    printf("Book borrowed successfully.\n");
}

void return_book() {
    char id[100], book_name[100];
    printf("Enter user ID: ");
    scanf("%s", id);
    int user_index = find_user(id);
    if (user_index == -1) {
        printf("User not found.\n");
        return;
    }
    printf("Enter book name: ");
    scanf("%s", book_name);
    int book_index = -1;
    for (int i = 0; i < users[user_index].borrowed; i++) {
        if (strcmp(users[user_index].books[i]->name, book_name) == 0) {
            book_index = i;
            break;
        }
    }
    if (book_index == -1) {
        printf("Book not found.\n");
        return;
    }
    books[book_index].quantity++;
    users[user_index].books[book_index] = users[user_index].books[--users[user_index].borrowed];
    printf("Book returned successfully.\n");
}

int main() {
    int choice;
    do {
        printf("Menu:\n");
        printf("1. Add book\n");
        printf("2. View books\n");
        printf("3. Add user\n");
        printf("4. View users\n");
        printf("5. Borrow book\n");
        printf("6. Return book\n");
        printf("0. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                view_books();
                break;
            case 3:
                add_user();
                break;
            case 4:
                view_users();
                break;
            case 5:
                borrow_book();
                break;
            case 6:
                return_book();
                break;
            case 0:
                printf("Exiting program...\n");
                break;
            default:
                printf("Invalid choice. Please try again.\n");
                break;
        }
    } while (choice != 0);
    return 0;
}

这个程序可以实现添加书籍、查看书籍、添加用户、查看用户、借阅书籍和归还书籍等功能。请注意，这里只是一个简单的示例程序，实际的图书管理系统可能需要更多的功能和更复杂的实现。