华为云代理商：c语言图书管理系统

以下是一个简单的C语言图书管理系统的代码示例：

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

#define MAX_BOOKS 100
#define MAX_TITLE 100
#define MAX_AUTHOR 100

typedef struct {
    int id;
    char title[MAX_TITLE];
    char author[MAX_AUTHOR];
    int available;
} Book;

Book library[MAX_BOOKS];
int book_count = 0;

void add_book() {
    if (book_count >= MAX_BOOKS) {
        printf("Library is full!n");
        return;
    }

    printf("Enter book title: ");
    getchar();  // to consume newline character from previous input
    fgets(library[book_count].title, MAX_TITLE, stdin);
    library[book_count].title[strcspn(library[book_count].title, "n")] = '';

    printf("Enter book author: ");
    fgets(library[book_count].author, MAX_AUTHOR, stdin);
    library[book_count].author[strcspn(library[book_count].author, "n")] = '';

    library[book_count].id = book_count + 1;
    library[book_count].available = 1;
    book_count++;

    printf("Book added successfully!n");
}

void display_books() {
    if (book_count == 0) {
        printf("No books in the library.n");
        return;
    }

    printf("IDtTitlettAuthorttAvailablen");
    for (int i = 0; i < book_count; i++) {
        printf("%dt%stt%stt%sn", library[i].id, library[i].title, library[i].author, library[i].available ? "Yes" : "No");
    }
}

void borrow_book() {
    int id;
    printf("Enter book ID to borrow: ");
    scanf("%d", &id);

    if (id > 0 && id <= book_count && library[id - 1].available) {
        library[id - 1].available = 0;
        printf("You have borrowed the book: %sn", library[id - 1].title);
    } else {
        printf("Book not available.n");
    }
}

void return_book() {
    int id;
    printf("Enter book ID to return: ");
    scanf("%d", &id);

    if (id > 0 && id <= book_count && !library[id - 1].available) {
        library[id - 1].available = 1;
        printf("You have returned the book: %sn", library[id - 1].title);
    } else {
        printf("Invalid book ID.n");
    }
}

int main() {
    int choice;

    while (1) {
        printf("nLibrary Management Systemn");
        printf("1. Add Bookn");
        printf("2. Display Booksn");
        printf("3. Borrow Bookn");
        printf("4. Return Bookn");
        printf("5. Exitn");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                display_books();
                break;
            case 3:
                borrow_book();
                break;
            case 4:
                return_book();
                break;
            case 5:
                exit(0);
            default:
                printf("Invalid choice, please try again.n");
        }
    }

    return 0;
}

该系统包括以下功能：

1. 添加图书
2. 显示图书列表
3. 借阅图书
4. 归还图书

运行该程序时，用户可以通过菜单选择不同的功能。图书信息包括图书编号、标题、作者和是否可用状态。