[C/C++]结课作业-图书管理系统

叁歲伎倆 2024-04-24 20:33 33阅读 0赞

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#include <stdio.h>
    #include <string.h>
    
    #define MAX_BOOKS 100
    #define MAX_NAME 50
    
    // 定义图书结构体
    typedef struct {
        int ID;//编号
        char fenlei[MAX_NAME];//分类
        char title[MAX_NAME];//书名
        char author[MAX_NAME];//作者
        char publisher[MAX_NAME];//出版社
        int quantity;//数量
        float price;//单价
    } Book;
    Book books[MAX_BOOKS];
    int numBook = 0;//数量
    // 函数声明
    void readBookData(Book books[]);
    void displayMenu(Book books[]);
    void searchByTitle(Book books[]);
    void displayAllBooks(Book books[]);
    void sortByQuantity(Book books[]);
    void calculateTotalPrices(Book books[]);
    void modifyBookData(Book books[]);
    void borrowBook(Book books[]);
    void AddBook(Book* book);
    void WriteFile(Book* books); 
    int main() {
        Book books[MAX_BOOKS];
    
        readBookData(books);
        displayMenu(books);
    
        return 0;
    }
    
    //写入文件
    void WriteFile(Book* books){
        // 将修改后的图书写入文件
        FILE *file = fopen("D:\\JK0112.txt", "w");
        if (file == NULL) {
            printf("无法打开文件！\n");
            return;
        }
    
        for (int i = 0; i < numBook; i++) {
            fprintf(file, "%d     %s     %s     %s     %s     %d     %f\n", books[i].ID, books[i].fenlei, books[i].title, books[i].author,
                    books[i].publisher,
                    books[i].quantity, books[i].price);
        }
    
        fclose(file);
    
        printf("图书信息已保存。\n");
    }
    //添加图书
    void AddBook(Book* book){
        printf("输入编号:");
        scanf("%d", &book[numBook].ID);
    
        for(int i = 0; i < numBook; i++){
            if(book[i].ID == book[numBook].ID) {
                printf("编号重复,添加失败\n");
                return;
            }
        }
    
        printf("输入分类:");
        scanf("%s", book[numBook].fenlei);
    
        printf("输入书名:");
        scanf("%s", book[numBook].title);
    
        printf("输入作者名:");
        scanf("%s", book[numBook].author);
    
        printf("输入出版社名:");
        scanf("%s", book[numBook].publisher);
    
        printf("输入数量:");
        scanf("%d", &book[numBook].quantity);
    
        printf("输入单价:");
        scanf("%f", &book[numBook].price);
    
        printf("添加成功!\n");
        numBook++;
        printf("%d\n", numBook);
    }
    // 从文件中读取图书数据
    void readBookData(Book books[]) {
        FILE *file = fopen("D:\\JK0112.txt", "r");
        if (file == NULL) {
            printf("无法打开文件！\n");
            return;
        }
        numBook = 0;
        // 读取文件中的数据并保存到结构体数组中
        while (fscanf(file, "%d     %s     %s     %s     %s     %d     %f\n", &books[numBook].ID,books[numBook].fenlei,books[numBook].title, books[numBook].author, books[numBook].publisher,
                      &books[numBook].quantity, &books[numBook].price) != EOF) {
            numBook++;
        }
        fclose(file);
    }
    // 显示菜单
    void displayMenu(Book books[]) {
        int choice;
    
        do {
            printf("\n======= 图书管理系统 =======\n");
            printf("1. 添加图书\n");
            printf("2. 按书名查询\n");
            printf("3. 显示全部\n");
            printf("4. 按图书数量排序\n");
            printf("5. 统计图书总价\n");
            printf("6. 修改图书信息\n");
            printf("7. 借阅图书\n");
            printf("0. 退出\n");
            printf("===========================\n");
    
            printf("请输入选项：");
            scanf("%d", &choice);
    
            switch (choice) {
                case 1:
                    AddBook(books);
                    break;
                case 2:
                    searchByTitle(books);
                    break;
                case 3:
                    displayAllBooks(books);
                    break;
                case 4:
                    sortByQuantity(books);
                    break;
                case 5:
                    calculateTotalPrices(books);
                    break;
                case 6:
                    modifyBookData(books);
                    break;
                case 7:
                    borrowBook(books);
                    break;
                case 0:
                    WriteFile(books);
                    printf("谢谢使用，再见！\n");
                    break;
                default:
                    printf("无效的选项，请重试。\n");
                    break;
            }
        } while (choice != 0);
    }
    // 按书名查询并显示满足条件的记录
    void searchByTitle(Book books[]) {
        char searchTitle[MAX_NAME];
        int i, found = 0;
    
        printf("请输入待查询的书名：");
      //  fflush(stdin);
        scanf("%s",searchTitle);
       // gets(searchTitle);
    
        printf("查询结果：\n");
        printf("编号\t分类\t\t书名\t作者\t出版社\t\t数量\t价格\n");
        for (i = 0; i < numBook; i++) {
            if (strcmp(books[i].title, searchTitle) == 0) {
                printf("%d\t%s\t%s\t%s\t%s\t%d\t\t%.2f", books[i].ID, books[i].fenlei, books[i].title, books[i].author,
                       books[i].publisher,
                       books[i].quantity, books[i].price);
                found = 1;
            }
        }
    
        if (!found) {
            printf("未找到匹配的记录。\n");
        }
    }
    // 显示全部记录
    void displayAllBooks(Book books[]) {
        int i;
        printf("所有图书记录：\n");
        printf("编号\t分类\t\t书名\t作者\t出版社\t\t数量\t价格\n");
        for (i = 0; i < numBook; i++) {
            printf("%d\t%s\t%s\t%s\t%s\t%d\t\t%.2f\n", books[i].ID, books[i].fenlei, books[i].title, books[i].author,
                   books[i].publisher,
                   books[i].quantity, books[i].price);
        }
    }
    
    // 按图书数量排序
    void sortByQuantity(Book books[]) {
        int i, j;
        Book temp;
    
        // 使用冒泡排序按图书数量排序
        for (i = 0; i < numBook - 1; i++) {
            for (j = 0; j < numBook - i - 1; j++) {
                if (books[j].quantity > books[j + 1].quantity) {
                    temp = books[j];
                    books[j] = books[j + 1];
                    books[j + 1] = temp;
                }
            }
        }
    
        printf("按图书数量排序后的结果：\n");
        displayAllBooks(books);
    }
    
    // 统计每本书的总价及所有图书的总价
    void calculateTotalPrices(Book books[]) {
        int i;
        float totalPrice = 0.0;
    
        for (i = 0; i < numBook; i++) {
            float bookPrice = books[i].quantity * books[i].price;
            printf("书名：%s，总价：%.2f\n", books[i].title, bookPrice);
            totalPrice += bookPrice;
        }
    
        printf("所有图书的总价为：%.2f\n", totalPrice);
    }
    
    // 修改图书信息
    void modifyBookData(Book books[]) {
        char searchTitle[MAX_NAME];
        int i, found = 0;
    
        printf("请输入要修改的书名：");
        //fflush(stdin);
        scanf("%s",searchTitle);
    
        for (i = 0; i < numBook; i++) {
            if (strcmp(books[i].title, searchTitle) == 0) {
                printf("请输入要修改的字段名：\n");
                printf("1. 分类\n");
                printf("2. 书名\n");
                printf("3. 作者\n");
                printf("4. 出版社\n");
                printf("5. 数量\n");
                printf("6. 单价\n");
    
                int choice;
                printf("请输入选项：");
                scanf("%d", &choice);
    
                switch (choice) {
                    case 1:
                        printf("请输入新的分类：");
                        fflush(stdin);
                        gets(books[i].fenlei);
                        break;
                    case 2:
                        printf("请输入新的书名：");
                        fflush(stdin);
                        gets(books[i].title);
                        break;
                    case 3:
                        printf("请输入新的作者：");
                        fflush(stdin);
                        gets(books[i].author);
                        break;
                    case 4:
                        printf("请输入新的出版社：");
                        scanf("%s", books[i].publisher);
                        break;
                    case 5:
                        printf("请输入新的数量：");
                        scanf("%d", &books[i].quantity);
                        break;
                    case 6:
                        printf("请输入新的单价：");
                        scanf("%f", &books[i].price);
                        break;
                    default:
                        printf("无效的选项，请重试。\n");
                        break;
                }
                found = 1;
                break;
            }
        }
    
        if (!found) {
            printf("未找到要修改的图书。\n");
        } else {
            // 将修改后的图书写入文件
            WriteFile(books);
            printf("图书信息已成功修改并保存。\n");
        }
    }
    
    // 借阅图书
    void borrowBook(Book books[]) {
        char searchTitle[MAX_NAME];
        int i, found = 0;
        int count = 0;
        printf("请输入要借阅的书名：");
        scanf("%s",searchTitle);
        for (i = 0; i < numBook; i++) {
            if (strcmp(books[i].title, searchTitle) == 0) {
                found = 1;
                count++;
                break;
            }
        }
    
        if (found&&count<=numBook) {
            printf("成功借阅图书：%s\n", books[i].title);
        } else  {
            printf("无法借阅。\n");
        }
    }

[Link 1]: https://blog.csdn.net/weixin_73865721?spm=1010.2135.3001.5343
[C_C]: https://blog.csdn.net/weixin_73865721?type=blog