图书信息管理系统用c语言

实现

以下是一个简单的图书信息管理系统的C语言实现。该系统可以添加、删除、查找和显示图书信息。

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

#define MAX_BOOKS 100

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

Book books[MAX_BOOKS];
int num_books = 0;

void add_book() {
    if (num_books >= MAX_BOOKS) {
        printf("Error: too many books\n");
        return;
    }
    Book book;
    printf("Enter book title: ");
    fgets(book.title, 50, stdin);
    printf("Enter author name: ");
    fgets(book.author, 50, stdin);
    printf("Enter publisher name: ");
    fgets(book.publisher, 50, stdin);
    printf("Enter publication year: ");
    scanf("%d", &book.year);
    getchar(); // consume newline
    books[num_books++] = book;
    printf("Book added successfully\n");
}

void delete_book() {
    if (num_books == 0) {
        printf("Error: no books available\n");
        return;
    }
    char title[50];
    printf("Enter book title to delete: ");
    fgets(title, 50, stdin);
    for (int i = 0; i < num_books; i++) {
        if (strcmp(books[i].title, title) == 0) {
            for (int 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");
}

void search_books() {
    if (num_books == 0) {
        printf("Error: no books available\n");
        return;
    }
    char title[50];
    printf("Enter book title to search: ");
    fgets(title, 50, stdin);
    for (int i = 0; i < num_books; i++) {
        if (strstr(books[i].title, title) != NULL) {
            printf("Book found:\n");
            printf("Title: %s", books[i].title);
            printf("Author: %s", books[i].author);
            printf("Publisher: %s", books[i].publisher);
            printf("Year: %d\n", books[i].year);
            return;
        }
    }
    printf("Error: book not found\n");
}

void display_books() {
    if (num_books == 0) {
        printf("No books available\n");
        return;
    }
    printf("List of books:\n");
    for (int i = 0; i < num_books; i++) {
        printf("%d. %s", i+1, books[i].title);
    }
}

int main() {
    int choice;
    do {
        printf("\n");
        printf("1. Add book\n");
        printf("2. Delete book\n");
        printf("3. Search books\n");
        printf("4. Display books\n");
        printf("5. Exit\n");
        printf("Enter choice: ");
        scanf("%d", &choice);
        getchar(); // consume newline
        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                delete_book();
                break;
            case 3:
                search_books();
                break;
            case 4:
                display_books();
                break;
            case 5:
                printf("Goodbye\n");
                break;
            default:
                printf("Invalid choice\n");
        }
    } while (choice != 5);
    return 0;
}

该系统定义了一个`Book`结构体，包含图书的标题、作者、出版商和出版年份。它还定义了一个`books`数组来存储所有的图书，并跟踪`num_books`变量来记录当前有多少本图书。

该系统包含四个函数：`add_book()`、`delete_book()`、`search_books()`和`display_books()`。`add_book()`函数从用户输入中读取图书信息，并将其添加到`books`数组中。`delete_book()`函数允许用户输入要删除的图书标题，并从`books`数组中删除匹配的图书。`search_books()`函数允许用户输入要查找的图书标题，并在`books`数组中查找匹配的图书。`display_books()`函数显示所有已添加的图书。

在`main()`函数中，该系统提供了一个简单的菜单，允许用户选择要执行的操作。循环直到用户选择退出。