c语言编写校园图书管理系统

以下是一个简单的C语言图书管理系统的实现，包括添加图书、删除图书、查找图书和显示所有图书等功能：

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

#define MAX_BOOKS 100

struct Book {
    char title[50];
    char author[50];
    int id;
};

struct Book books[MAX_BOOKS];
int num_books = 0;

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

void remove_book() {
    int id;
    printf("Enter id of book to remove: ");
    scanf("%d", &id);
    for (int i = 0; i < num_books; i++) {
        if (books[i].id == id) {
            for (int j = i; j < num_books - 1; j++) {
                books[j] = books[j + 1];
            }
            num_books--;
            printf("Book removed successfully\n");
            return;
        }
    }
    printf("Error: book not found\n");
}

void find_book() {
    char title[50];
    printf("Enter title of book to find: ");
    scanf("%s", title);
    for (int i = 0; i < num_books; i++) {
        if (strcmp(books[i].title, title) == 0) {
            printf("Book found:\n");
            printf("Title: %s\n", books[i].title);
            printf("Author: %s\n", books[i].author);
            printf("ID: %d\n", books[i].id);
            return;
        }
    }
    printf("Error: book not found\n");
}

void show_books() {
    printf("All books:\n");
    for (int i = 0; i < num_books; i++) {
        printf("Title: %s\n", books[i].title);
        printf("Author: %s\n", books[i].author);
        printf("ID: %d\n", books[i].id);
        printf("\n");
    }
}

int main() {
    int choice;
    while (1) {
        printf("Enter choice:\n");
        printf("1. Add book\n");
        printf("2. Remove book\n");
        printf("3. Find book\n");
        printf("4. Show all books\n");
        printf("5. Quit\n");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                remove_book();
                break;
            case 3:
                find_book();
                break;
            case 4:
                show_books();
                break;
            case 5:
                exit(0);
            default:
                printf("Error: invalid choice\n");
        }
    }
    return 0;
}