用c写一个图书管理系统

好的，下面是一个简单的图书管理系统的C代码：

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

#define MAX_BOOKS 100 // 最大图书数量

typedef struct {
    char title[50]; // 书名
    char author[20]; // 作者
    int year; // 出版年份
    int copies; // 剩余复本数
} Book;

Book books[MAX_BOOKS]; // 图书数组
int num_books = 0; // 当前图书数量

void add_book() {
    if (num_books >= MAX_BOOKS) {
        printf("Error: too many books.\n");
        return;
    }
    Book book;
    printf("Enter book title: ");
    scanf("%s", book.title);
    printf("Enter author name: ");
    scanf("%s", book.author);
    printf("Enter publication year: ");
    scanf("%d", &book.year);
    printf("Enter number of copies: ");
    scanf("%d", &book.copies);
    books[num_books++] = book;
    printf("Book added successfully.\n");
}

void search_book() {
    char title[50];
    printf("Enter book title: ");
    scanf("%s", title);
    for (int i = 0; i < num_books; i++) {
        if (strcmp(title, books[i].title) == 0) {
            printf("Title: %s\n", books[i].title);
            printf("Author: %s\n", books[i].author);
            printf("Year: %d\n", books[i].year);
            printf("Copies: %d\n", books[i].copies);
            return;
        }
    }
    printf("Book not found.\n");
}

void display_books() {
    printf("Title\tAuthor\tYear\tCopies\n");
    for (int i = 0; i < num_books; i++) {
        printf("%s\t%s\t%d\t%d\n", books[i].title, books[i].author, books[i].year, books[i].copies);
    }
}

int main() {
    int choice;
    while (1) {
        printf("1. Add book\n");
        printf("2. Search book\n");
        printf("3. Display all books\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                search_book();
                break;
            case 3:
                display_books();
                break;
            case 4:
                exit(0);
            default:
                printf("Invalid choice.\n");
        }
        printf("\n");
    }
    return 0;
}

这个图书管理系统包括以下功能：

- 添加图书
- 搜索图书
- 显示所有图书
- 退出程序

你可以根据自己的需求进行修改和完善。