【C语音期末/课程设计】图书管理系统(vs2022项目)

#include <stdio.h> #include <string.h> #include <stdlib.h> #define USERNAME "admin" // 预设用户名 #define PASSWORD "123456" // 预设密码 // 定义图书信息结构体 struct Book { int id; // 图书编号 char title[100]; // 书名 char author[50]; // 作者 char publisher[50]; // 出版社 }; // 声明全局的结构体数组和书籍计数变量 struct Book library[50]; // 长度为50的结构体数组，用于存储图书信息 int book_count = 0; // 表示当前数据条数 // 将图书信息存储到CSV文件中 void save_to_csv(const char* filename) { FILE* file = NULL; if (fopen_s(&file, filename, "w") != 0) { perror("无法打开文件以写入"); return; } // 写入表头 fprintf(file, "ID,Title,Author,Publisher\n"); // 写入每一本书的信息 for (int i = 0; i < book_count; i++) { fprintf(file, "%d,%s,%s,%s\n", library[i].id, library[i].title, library[i].author, library[i].publisher); } fclose(file); } // 从CSV文件读取图书信息 void load_from_csv(const char* filename) { FILE* file = NULL; if (fopen_s(&file, filename, "r") != 0) { perror("无法打开文件以读取"); return; } char line[256]; book_count = 0; // 清空原有数据 // 跳过表头 fgets(line, sizeof(line), file); // 读取每一行数据 while (fgets(line, sizeof(line), file)) { if (book_count >= 50) { printf("数组已满，无法加载更多数据。\n"); break; } // 使用 sscanf_s 解析CSV行数据 sscanf_s(line, "%d,%99[^,],%49[^,],%49[^\n]", &library[book_count].id, library[book_count].title, (unsigned)_countof(library[book_count].title), library[book_count].author, (unsigned)_countof(library[book_count].author), library[book_count].publisher, (unsigned)_countof(library[book_count].publisher)); book_count++; } fclose(file); } // 检查图书编号是否重复的函数 int isIdDuplicate(int id) { for (int i = 0; i < book_count; i++) { if (library[i].id == id) { return 1; // 如果编号重复，返回1 } } return 0; // 不重复，返回0 } // 添加图书信息的函数，使用 scanf_s 接收用户输入 void addBook() { if (book_count >= 50) { printf("图书库已满，无法添加新书。\n"); return; } int id; char title[100], author[50], publisher[50]; // 逐行接收用户输入 printf("请输入图书编号: "); scanf_s("%d", &id); // 检查图书编号是否重复 if (isIdDuplicate(id)) { printf("图书编号重复，无法添加。\n"); return; // 直接返回函数 } printf("请输入书名: "); scanf_s("%99s", title, (unsigned int)sizeof(title)); printf("请输入作者: "); scanf_s("%49s", author, (unsigned int)sizeof(author)); printf("请输入出版社: "); scanf_s("%49s", publisher, (unsigned int)sizeof(publisher)); // 将数据保存到结构体数组中，使用 strcpy_s library[book_count].id = id; strcpy_s(library[book_count].title, sizeof(library[book_count].title), title); strcpy_s(library[book_count].author, sizeof(library[book_count].author), author); strcpy_s(library[book_count].publisher, sizeof(library[book_count].publisher), publisher); book_count++; // 增加当前数据条数 printf("图书添加成功！\n"); } // 检查图书编号是否存在的函数 int findBookById(int id) { for (int i = 0; i < book_count; i++) { if (library[i].id == id) { return i; // 返回找到的图书索引 } } return -1; // 未找到，返回-1 } // 修改图书信息的函数 void modifyBook() { int id, choice; printf("请输入要修改的图书编号: "); scanf_s("%d", &id); int index = findBookById(id); if (index == -1) { printf("未找到图书编号为 %d 的图书。\n", id); return; // 图书未找到，直接返回 } // 显示操作选项 printf("选择要修改的信息:\n"); printf("1. 书名\n"); printf("2. 作者\n"); printf("3. 出版社\n"); printf("请输入选择: "); scanf_s("%d", &choice); // 根据用户选择修改对应的字段 switch (choice) { case 1: { char newTitle[100]; printf("请输入新的书名: "); scanf_s("%99s", newTitle, (unsigned int)sizeof(newTitle)); strcpy_s(library[index].title, sizeof(library[index].title), newTitle); printf("书名修改成功！\n"); break; } case 2: { char newAuthor[50]; printf("请输入新的作者: "); scanf_s("%49s", newAuthor, (unsigned int)sizeof(newAuthor)); strcpy_s(library[index].author, sizeof(library[index].author), newAuthor); printf("作者修改成功！\n"); break; } case 3: { char newPublisher[50]; printf("请输入新的出版社: "); scanf_s("%49s", newPublisher, (unsigned int)sizeof(newPublisher)); strcpy_s(library[index].publisher, sizeof(library[index].publisher), newPublisher); printf("出版社修改成功！\n"); break; } default: printf("无效选择。\n"); break; } } // 查询图书信息的函数 void queryBook() { int choice; printf("选择查询条件:\n"); printf("1. 图书编号\n"); printf("2. 书名\n"); printf("3. 作者\n"); printf("4. 出版社\n"); printf("请输入选择: "); scanf_s("%d", &choice); // 根据选择进行查询 switch (choice) { case 1: { int id; printf("请输入图书编号: "); scanf_s("%d", &id); // 输出表头 printf("\n"); printf("%-10s %-20s %-10s %-30s\n", "图书编号", "书名", "作者", "出版社"); printf("--------------------------------------------------------------\n"); for (int i = 0; i < book_count; i++) { if (library[i].id == id) { printf("%-10d %-20s %-10s %-30s\n", library[i].id, library[i].title, library[i].author, library[i].publisher); return; // 找到后返回 } } printf("未找到图书编号为 %d 的图书。\n", id); break; } case 2: { char title[100]; printf("请输入书名: "); scanf_s("%99s", title, (unsigned int)sizeof(title)); int found = 0; // 输出表头 printf("\n"); printf("%-10s %-20s %-10s %-30s\n", "图书编号", "书名", "作者", "出版社"); printf("--------------------------------------------------------------\n"); for (int i = 0; i < book_count; i++) { if (strcmp(library[i].title, title) == 0) { printf("%-10d %-20s %-10s %-30s\n", library[i].id, library[i].title, library[i].author, library[i].publisher); found = 1; } } if (!found) { printf("未找到书名为 %s 的图书。\n", title); } break; } case 3: { char author[50]; printf("请输入作者: "); scanf_s("%49s", author, (unsigned int)sizeof(author)); int found = 0; // 输出表头 printf("\n"); printf("%-10s %-20s %-10s %-30s\n", "图书编号", "书名", "作者", "出版社"); printf("--------------------------------------------------------------\n"); for (int i = 0; i < book_count; i++)