写c语言图书管理系统程序

以下是一个简单的 C 语言图书管理系统程序：

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

#define MAX_BOOKS 100

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

struct Library {
    struct Book books[MAX_BOOKS];
    int num_books;
};

void display_menu() {
    printf("Welcome to the Library Management System\n");
    printf("----------------------------------------\n");
    printf("1. Add book\n");
    printf("2. Remove book\n");
    printf("3. Display all books\n");
    printf("4. Search book by title\n");
    printf("5. Search book by author\n");
    printf("6. Exit\n");
}

void add_book(struct Library *library) {
    if (library->num_books >= MAX_BOOKS) {
        printf("Error: library is full\n");
        return;
    }

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

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

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

    library->num_books++;

    printf("Book added successfully\n");
}

void remove_book(struct Library *library) {
    char title[50];
    printf("Enter book title to remove: ");
    scanf("%s", title);

    for (int i = 0; i < library->num_books; i++) {
        if (strcmp(title, library->books[i].title) == 0) {
            for (int j = i; j < library->num_books - 1; j++) {
                strcpy(library->books[j].title, library->books[j+1].title);
                strcpy(library->books[j].author, library->books[j+1].author);
                library->books[j].year = library->books[j+1].year;
            }
            library->num_books--;
            printf("Book removed successfully\n");
            return;
        }
    }

    printf("Error: book not found\n");
}

void display_books(struct Library *library) {
    printf("%-30s %-30s %-4s\n", "Title", "Author", "Year");
    printf("----------------------------------------\n");

    for (int i = 0; i < library->num_books; i++) {
        printf("%-30s %-30s %-4d\n", library->books[i].title, library->books[i].author, library->books[i].year);
    }
}

void search_book_by_title(struct Library *library) {
    char title[50];
    printf("Enter book title to search: ");
    scanf("%s", title);

    for (int i = 0; i < library->num_books; i++) {
        if (strcmp(title, library->books[i].title) == 0) {
            printf("%-30s %-30s %-4s\n", "Title", "Author", "Year");
            printf("----------------------------------------\n");
            printf("%-30s %-30s %-4d\n", library->books[i].title, library->books[i].author, library->books[i].year);
            return;
        }
    }

    printf("Error: book not found\n");
}

void search_book_by_author(struct Library *library) {
    char author[50];
    printf("Enter book author to search: ");
    scanf("%s", author);

    for (int i = 0; i < library->num_books; i++) {
        if (strcmp(author, library->books[i].author) == 0) {
            printf("%-30s %-30s %-4s\n", "Title", "Author", "Year");
            printf("----------------------------------------\n");
            printf("%-30s %-30s %-4d\n", library->books[i].title, library->books[i].author, library->books[i].year);
        }
    }

    printf("Error: book not found\n");
}

int main() {
    struct Library library = {0};

    int choice;
    do {
        display_menu();
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_book(&library);
                break;
            case 2:
                remove_book(&library);
                break;
            case 3:
                display_books(&library);
                break;
            case 4:
                search_book_by_title(&library);
                break;
            case 5:
                search_book_by_author(&library);
                break;
            case 6:
                printf("Goodbye!\n");
                break;
            default:
                printf("Error: invalid choice\n");
                break;
        }
    } while (choice != 6);

    return 0;
}

注意：这只是一个简单的示例程序，实际的图书管理系统需要更全面和复杂的功能。