C++期末/课程设计：二手物品交易管理系统(DevC++)

#include <iostream> #include <fstream> #include <string> #include <iomanip> #include <cstdlib> #include "goods.h" #include "trade.h" using namespace std; bool fileExists(const string& filename) { ifstream file(filename.c_str()); return file.good(); } void createFileIfNotExists(const string& filename) { if (!fileExists(filename)) { ofstream file(filename.c_str()); if (file) { cout << "创建文件: " << filename << endl; } else { cerr << "创建失败: " << filename << endl; } } } //打印操作界面 void display() { system("cls"); // 清空控制台 cout << "********************************\n"; cout << "| 欢迎使用物品管理系统 |\n"; cout << "********************************\n"; cout << "| 1. 录入物品 |\n"; cout << "| 2. 修改物品 |\n"; cout << "| 3. 查询物品 |\n"; cout << "| 4. 删除物品 |\n"; cout << "| 5. 购买物品 |\n"; cout << "| 6. 删除交易记录 |\n"; cout << "| 7. 显示物品 |\n"; cout << "| 8. 退出系统 |\n"; cout << "********************************\n"; cout << "请选择操作："; } //添加物品信息 void add_goods(Goods& goods) { int num; string name, pubName, contact, time; double new_price; int new_quantity; cout << "请输入物品信息:\n"; cout << "编号: "; cin >> num; cin.ignore(); // 忽略输入缓冲区中的换行符 cout << "名称: "; getline(cin, name); cout << "单价: "; cin >> new_price; cout << "库存数量: "; cin >> new_quantity; cin.ignore(); // 忽略输入缓冲区中的换行符 cout << "发布者姓名: "; getline(cin, pubName); cout << "联系电话: "; getline(cin, contact); cout << "发布时间: "; getline(cin, time); goods.addItem(num, name, new_price, new_quantity, pubName, contact, time); // 将物品信息添加到 goodsList 中 } //修改物品信息 void update_goods(Goods& goods) { int num; string fieldName, newValue; cout << "请输入要修改的物品信息编号: "; cin >> num; cin.ignore(); // 清空输入缓冲区 cout << "请选择要修改的项:\n"; cout << "1. 名称\n"; cout << "2. 单价\n"; cout << "3. 库存量\n"; cout << "4. 发布者姓名\n"; cout << "5. 联系电话\n"; cout << "6. 发布时间\n"; cout << "请输入操作编号: "; int option; cin >> option; cin.ignore(); // 清空输入缓冲区 switch (option) { case 1: fieldName = "itemName"; break; case 2: fieldName = "unitPrice"; break; case 3: fieldName = "stockQuantity"; break; case 4: fieldName = "publisherName"; break; case 5: fieldName = "publisherContact"; break; case 6: fieldName = "publishTime"; break; default: cout << "错误：无效的操作编号\n"; return; } cout << "请输入新的内容: "; getline(cin, newValue); goods.update_item(num, fieldName, newValue); } //查询物品 void find_goods(Goods& goods) { int num; cout << "请输入物品信息编号: "; cin >> num; cin.ignore(); // 清空输入缓冲区 goods.find_item(num); } //删除物品 void delete_goods(Goods& goods) { int num; cout << "请输入物品信息编号: "; cin >> num; cin.ignore(); // 清空输入缓冲区 goods.delete_item(num); } //购买二手物品 void buy_goods(Goods& goods,Trade& trade) { int flag; Goods::Item good; int num,number; string bName, bContact,time; cout << "请输入物品信息编号: "; cin >> num; cin.ignore(); // 清空输入缓冲区 good=goods.find_item(num); if(good.itemNumber!=-1) { cout << "请输入物购买数量: "; cin >> number; cin.ignore(); // 清空输入缓冲区 flag=goods.sell_item(num,number); if(flag==0) { return; } cout<<"总价："<<number*good.unitPrice<<endl; cout << "购买者姓名: "; getline(cin, bName); cout << "联系电话: "; getline(cin, bContact); cout << "购买时间: "; getline(cin, time); if(flag) { trade.addItem(good.itemNumber, good.itemName, good.unitPrice, number, bName, bContact,time); }; } } //删除交易信息 void delete_trade(Trade& trade) { int num; cout << "请输入物品信息编号: "; cin >> num; cin.ignore(); // 清空输入缓冲区 trade.delete_item(num); } int main() { int choice; bool running = true; Goods goodsList; Trade tradeList; // 检查并创建csv createFileIfNotExists("goods.csv"); createFileIfNotExists("trade.csv"); // 从文件中读取物品信息 goodsList.getGoods("goods.csv"); tradeList.getTrade("trade.csv"); //循环执行操作 while (running) { display(); cin >> choice; system("cls"); switch (choice) { case 1: add_goods(goodsList); break; case 2: cout << "录入物品信息\n"; update_goods(goodsList); break; case 3: cout << "查询物品信息\n"; find_goods(goodsList); break; case 4: cout << "删除物品信息\n"; goodsList.printItems(); delete_goods(goodsList); break; case 5: cout << "购买物品\n"; goodsList.printItems(); buy_goods(goodsList,tradeList); break; case 6: cout << "删除物品交易信息\n"; tradeList.printItems(); delete_trade(tradeList); break; case 7: cout << "显示物品信息\n"; cout << "物品信息：\n"; goodsList.printItems(); cout << "\n交易记录：\n"; tradeList.printItems(); break; case 8: cout << "退出系统\n"; running = false; // 结束循环，退出系统 break; default: cout << "无效操作，请重新选择\n"; break; } //保存物品信息到文件 goodsList.setGoods("goods.csv"); //保存交易项到文件 tradeList.setTrade("trade.csv"); system("pause"); } return 0; } //示例 // 添加物品信息 //goodsList.addItem(1001, "笔记本电脑", 10.99, 50, "张三", "123-456-7890", "2024-05-11"); //goodsList.addItem(1002, "智能手机", 19.99, 30, "李四", "987-654-3210", "2024-05-12"); //goodsList.setGoods("goods.csv"); // 创建两个交易项 //tradeList.addItem(1001, "笔记本电脑", 1200.50, 2, "张三", "123-456-7890", "2024-05-11"); //tradeList.addItem(1002, "智能手机", 899.99, 1, "李四", "987-654-3210", "2024-05-12"); //tradeList.setTrade("trade.csv");