用c语言写一个图书管理系统

好的，以下是一个基于C语言的简单图书管理系统的代码示例：

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

#define MAX_BOOKS 100
#define MAX_TITLE_LENGTH 50

struct Book {
    char title[MAX_TITLE_LENGTH];
    int year;
    float price;
};

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

void add_book() {
    if (num_books < MAX_BOOKS) {
        struct Book new_book;
        printf("Enter the title of the book: ");
        scanf("%s", new_book.title);
        printf("Enter the year of publication: ");
        scanf("%d", &new_book.year);
        printf("Enter the price of the book: ");
        scanf("%f", &new_book.price);
        library[num_books++] = new_book;
        printf("Book added successfully!\n\n");
    } else {
        printf("Library is full. Cannot add more books.\n\n");
    }
}

void display_books() {
    if (num_books == 0) {
        printf("No books in the library.\n\n");
    } else {
        printf("Books in the library:\n");
        for (int i = 0; i < num_books; i++) {
            printf("%d. %s, published in %d, price: $%.2f\n", i+1, library[i].title, library[i].year, library[i].price);
        }
        printf("\n");
    }
}

void search_book() {
    if (num_books == 0) {
        printf("No books in the library.\n\n");
    } else {
        char search_title[MAX_TITLE_LENGTH];
        printf("Enter the title of the book to search: ");
        scanf("%s", search_title);
        int found = 0;
        for (int i = 0; i < num_books; i++) {
            if (strcmp(library[i].title, search_title) == 0) {
                printf("Book found:\n");
                printf("%s, published in %d, price: $%.2f\n\n", library[i].title, library[i].year, library[i].price);
                found = 1;
                break;
            }
        }
        if (!found) {
            printf("Book not found.\n\n");
        }
    }
}

void delete_book() {
    if (num_books == 0) {
        printf("No books in the library.\n\n");
    } else {
        char delete_title[MAX_TITLE_LENGTH];
        printf("Enter the title of the book to delete: ");
        scanf("%s", delete_title);
        int found = 0;
        for (int i = 0; i < num_books; i++) {
            if (strcmp(library[i].title, delete_title) == 0) {
                for (int j = i; j < num_books - 1; j++) {
                    library[j] = library[j+1];
                }
                num_books--;
                printf("Book deleted successfully!\n\n");
                found = 1;
                break;
            }
        }
        if (!found) {
            printf("Book not found.\n\n");
        }
    }
}

int main() {
    int choice;
    do {
        printf("Select an option:\n");
        printf("1. Add a book\n");
        printf("2. Display all books\n");
        printf("3. Search for a book\n");
        printf("4. Delete a book\n");
        printf("5. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        printf("\n");
        switch (choice) {
            case 1: add_book(); break;
            case 2: display_books(); break;
            case 3: search_book(); break;
            case 4: delete_book(); break;
            case 5: printf("Goodbye!"); break;
            default: printf("Invalid choice. Please try again.\n\n");
        }
    } while (choice != 5);
    return 0;
}

这个程序实现了以下功能：

1. 添加一本书：输入书名、出版年份、价格，添加到图书馆中；
2. 显示所有书籍：列出所有已添加到图书馆中的书籍；
3. 搜索一本书：输入书名，查找图书馆中是否有匹配的书籍；
4. 删除一本书：输入书名，从图书馆中删除匹配的书籍；
5. 退出程序：结束图书馆管理系统。

请注意，此示例程序仅供参考，实际应用中可能需要更复杂的功能和数据结构。