图书管理系统（代码生成）C语言

以下是一个简单的图书管理系统的C语言代码示例，包括添加新书、修改书籍信息、删除书籍和图书查询功能：

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

#define MAX_BOOKS 100 // 最大书籍数量

// 书籍结构体
typedef struct {
    char title[50]; // 书名
    char author[50]; // 作者
    char publisher[50]; // 出版社
    char isbn[20]; // ISBN号
    int stock; // 库存数量
} Book;

// 全局变量
Book books[MAX_BOOKS]; // 存储所有书籍的数组
int num_books = 0; // 当前书籍数量

// 添加新书
void add_book() {
    if (num_books >= MAX_BOOKS) {
        printf("Error: too many books.\n");
        return;
    }
    Book new_book;
    printf("Enter book title: ");
    scanf("%s", new_book.title);
    printf("Enter book author: ");
    scanf("%s", new_book.author);
    printf("Enter book publisher: ");
    scanf("%s", new_book.publisher);
    printf("Enter book ISBN: ");
    scanf("%s", new_book.isbn);
    printf("Enter book stock: ");
    scanf("%d", &new_book.stock);
    books[num_books] = new_book;
    num_books++;
    printf("Book added successfully.\n");
}

// 修改书籍信息
void modify_book() {
    char isbn[20];
    printf("Enter book ISBN: ");
    scanf("%s", isbn);
    int i;
    for (i = 0; i < num_books; i++) {
        if (strcmp(books[i].isbn, isbn) == 0) {
            printf("Enter new stock: ");
            scanf("%d", &books[i].stock);
            printf("Book modified successfully.\n");
            return;
        }
    }
    printf("Error: book not found.\n");
}

// 删除书籍
void delete_book() {
    char isbn[20];
    printf("Enter book ISBN: ");
    scanf("%s", isbn);
    int i;
    for (i = 0; i < num_books; i++) {
        if (strcmp(books[i].isbn, isbn) == 0) {
            int j;
            for (j = i; j < num_books - 1; j++) {
                books[j] = books[j + 1];
            }
            num_books--;
            printf("Book deleted successfully.\n");
            return;
        }
    }
    printf("Error: book not found.\n");
}

// 图书查询功能
void search_books() {
    char keyword[50];
    printf("Enter search keyword: ");
    scanf("%s", keyword);
    int i;
    for (i = 0; i < num_books; i++) {
        if (strstr(books[i].title, keyword) != NULL ||
            strstr(books[i].author, keyword) != NULL ||
            strstr(books[i].publisher, keyword) != NULL ||
            strstr(books[i].isbn, keyword) != NULL) {
            printf("Title: %s\n", books[i].title);
            printf("Author: %s\n", books[i].author);
            printf("Publisher: %s\n", books[i].publisher);
            printf("ISBN: %s\n", books[i].isbn);
            printf("Stock: %d\n", books[i].stock);
            printf("\n");
        }
    }
}

int main() {
    int choice;
    while (1) {
        printf("1. Add book\n");
        printf("2. Modify book\n");
        printf("3. Delete book\n");
        printf("4. Search books\n");
        printf("5. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                modify_book();
                break;
            case 3:
                delete_book();
                break;
            case 4:
                search_books();
                break;
            case 5:
                exit(0);
            default:
                printf("Invalid choice.\n");
        }
    }
    return 0;
}