c语言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示例代码：

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

#define MAX_BOOKS 100

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

Book library[MAX_BOOKS];
int num_books = 0;

void add_book() {
    if (num_books == MAX_BOOKS) {
        printf("Error: Library is full!\n");
        return;
    }

    printf("Enter book title: ");
    scanf("%s", library[num_books].title);

    printf("Enter book author: ");
    scanf("%s", library[num_books].author);

    printf("Enter book year: ");
    scanf("%d", &library[num_books].year);

    num_books++;
    printf("Book added successfully.\n");
}

void list_books() {
    if (num_books == 0) {
        printf("Library is empty.\n");
        return;
    }

    printf("List of books:\n");
    for (int i = 0; i < num_books; i++) {
        printf("%d. %s by %s (%d)\n", i+1, library[i].title, library[i].author, library[i].year);
    }
}

void search_book() {
    if (num_books == 0) {
        printf("Library is empty.\n");
        return;
    }

    char search_title[50];
    printf("Enter book title to search: ");
    scanf("%s", search_title);

    for (int i = 0; i < num_books; i++) {
        if (strcmp(search_title, library[i].title) == 0) {
            printf("%s by %s (%d)\n", library[i].title, library[i].author, library[i].year);
            return;
        }
    }

    printf("Book not found.\n");
}

int main() {
    int choice;

    do {
        printf("\nLibrary Management System\n");
        printf("1. Add book\n");
        printf("2. List books\n");
        printf("3. Search book\n");
        printf("4. Quit\n");
        printf("Enter choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                list_books();
                break;
            case 3:
                search_book();
                break;
            case 4:
                printf("Goodbye!\n");
                exit(0);
            default:
                printf("Invalid choice. Try again.\n");
                break;
        }
    } while (choice != 4);

    return 0;
}

这个程序定义了 `Book` 结构体，其中包括书籍的标题、作者和出版年份。然后定义了一个 `library` 全局数组，用于存储图书馆中的图书。在主函数中，通过一个循环菜单，用户可以选择添加新书、列出所有书籍或搜索特定书籍。程序还包括一些基本的错误检查，例如防止图书馆已满或在搜索时不存在书籍。