C语言编写一个简易图书管理系统

以下是一个简单的图书管理系统的 C 语言实现，包括添加图书、查找图书、删除图书和显示所有图书的功能。

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

#define MAX_BOOKS 100

// 图书结构体
struct Book {
    char id[10];        // 图书编号
    char title[50];     // 图书标题
    char author[30];    // 图书作者
    int year;           // 出版年份
};

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

// 添加图书
void add_book() {
    if (num_books >= MAX_BOOKS) {
        printf("Sorry, the library is full.\n");
        return;
    }
    struct Book book;
    printf("Please enter book ID: ");
    scanf("%s", book.id);
    printf("Please enter book title: ");
    scanf("%s", book.title);
    printf("Please enter book author: ");
    scanf("%s", book.author);
    printf("Please enter publication year: ");
    scanf("%d", &book.year);
    books[num_books++] = book;
    printf("Book added successfully.\n");
}

// 查找图书
void find_book() {
    char id[10];
    printf("Please enter book ID: ");
    scanf("%s", id);
    for (int i = 0; i < num_books; i++) {
        if (strcmp(id, books[i].id) == 0) {
            printf("Book found:\n");
            printf("ID: %s\n", books[i].id);
            printf("Title: %s\n", books[i].title);
            printf("Author: %s\n", books[i].author);
            printf("Publication year: %d\n", books[i].year);
            return;
        }
    }
    printf("Sorry, book not found.\n");
}

// 删除图书
void delete_book() {
    char id[10];
    printf("Please enter book ID: ");
    scanf("%s", id);
    for (int i = 0; i < num_books; i++) {
        if (strcmp(id, books[i].id) == 0) {
            for (int j = i; j < num_books - 1; j++) {
                books[j] = books[j+1];
            }
            num_books--;
            printf("Book deleted successfully.\n");
            return;
        }
    }
    printf("Sorry, book not found.\n");
}

// 显示所有图书
void display_books() {
    printf("Library contains %d books:\n", num_books);
    for (int i = 0; i < num_books; i++) {
        printf("ID: %s\n", books[i].id);
        printf("Title: %s\n", books[i].title);
        printf("Author: %s\n", books[i].author);
        printf("Publication year: %d\n", books[i].year);
    }
}

int main() {
    int choice;
    do {
        printf("\nLibrary Management System\n");
        printf("1. Add book\n");
        printf("2. Find book\n");
        printf("3. Delete book\n");
        printf("4. Display all books\n");
        printf("0. Exit\n");
        printf("Please enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                find_book();
                break;
            case 3:
                delete_book();
                break;
            case 4:
                display_books();
                break;
            case 0:
                printf("Goodbye!\n");
                break;
            default:
                printf("Invalid choice.\n");
        }
    } while (choice != 0);
    return 0;
}

注意：此为简单的实现，未考虑并发、安全性等问题。在实际开发中需要进行更加严谨的设计和实现。