自助点餐系统c++

下面是一个简单的基于C++实现的自助点餐系统代码示例：

#include <iostream>
#include <fstream>
#include <vector>
#include <iomanip>
#include <string>

using namespace std;

// 菜品结构体
struct Dish {
    string name;    // 菜名
    double price;   // 价格
    string desc;    // 描述
};

// 读取菜单信息
vector<Dish> readMenu() {
    vector<Dish> menu;
    ifstream ifs("menu.txt");
    if (!ifs.is_open()) {
        cout << "菜单文件不存在！" << endl;
        return menu;
    }
    Dish dish;
    while (ifs >> dish.name >> dish.price) {
        getline(ifs, dish.desc);
        menu.push_back(dish);
    }
    ifs.close();
    return menu;
}

// 展示菜单
void showMenu(const vector<Dish>& menu) {
    cout << "****************** 菜单 ******************" << endl;
    cout << setw(10) << "编号" << setw(10) << "名称" << setw(10) << "价格" << setw(20) << "描述" << endl;
    for (int i = 0; i < menu.size(); i++) {
        cout << setw(10) << i + 1 << setw(10) << menu[i].name << setw(10) << menu[i].price << setw(20) << menu[i].desc << endl;
    }
    cout << "*******************************************" << endl;
}

// 点菜
void order(vector<Dish>& menu, vector<int>& orderList) {
    int dishId, num;
    cout << "请输入菜品编号和数量（输入0结束）：" << endl;
    while (true) {
        cin >> dishId;
        if (dishId == 0) {
            break;
        }
        cin >> num;
        orderList[dishId - 1] += num;
    }
    // 输出当前点餐情况
    cout << "************ 当前点餐情况 ************" << endl;
    cout << setw(10) << "编号" << setw(10) << "名称" << setw(10) << "数量" << setw(10) << "小计" << endl;
    double total = 0;
    for (int i = 0; i < menu.size(); i++) {
        if (orderList[i] > 0) {
            double subtotal = orderList[i] * menu[i].price;
            total += subtotal;
            cout << setw(10) << i + 1 << setw(10) << menu[i].name << setw(10) << orderList[i] << setw(10) << subtotal << endl;
        }
    }
    cout << "总计：" << total << endl;
    cout << "***************************************" << endl;
}

// 结账
void checkout(vector<Dish>& menu, const vector<int>& orderList) {
    double total = 0;
    for (int i = 0; i < menu.size(); i++) {
        if (orderList[i] > 0) {
            double subtotal = orderList[i] * menu[i].price;
            total += subtotal;
        }
    }
    cout << "总计：" << total << endl;
    cout << "请输入支付金额：" << endl;
    double payment;
    cin >> payment;
    if (payment < total) {
        cout << "支付金额不足，请重新输入：" << endl;
        cin >> payment;
    }
    double change = payment - total;
    cout << "找零：" << change << endl;
    // 保存订单信息到文件
    ofstream ofs("orders.txt", ios::app);
    if (ofs.is_open()) {
        ofs << "订单号：" << time(NULL) << endl;
        for (int i = 0; i < menu.size(); i++) {
            if (orderList[i] > 0) {
                ofs << menu[i].name << " * " << orderList[i] << " = " << orderList[i] * menu[i].price << endl;
            }
        }
        ofs << "总计：" << total << endl;
        ofs << "支付：" << payment << endl;
        ofs << "找零：" << change << endl;
        ofs << "*******************************************" << endl;
        ofs.close();
    }
}

// 查询订单
void queryOrders() {
    ifstream ifs("orders.txt");
    if (!ifs.is_open()) {
        cout << "暂无订单信息！" << endl;
        return;
    }
    string line;
    while (getline(ifs, line)) {
        cout << line << endl;
    }
    ifs.close();
}

int main() {
    vector<Dish> menu = readMenu();
    vector<int> orderList(menu.size(), 0);
    while (true) {
        cout << "请选择操作：1.查看菜单 2.点菜 3.结账 4.查询订单 5.退出" << endl;
        int choice;
        cin >> choice;
        switch (choice) {
        case 1:
            showMenu(menu);
            break;
        case 2:
            order(menu, orderList);
            break;
        case 3:
            checkout(menu, orderList);
            break;
        case 4:
            queryOrders();
            break;
        case 5:
            return 0;
        default:
            cout << "无效操作，请重新选择！" << endl;
            break;
        }
    }
    return 0;
}

该示例代码包含了菜单读取、菜单展示、点菜、结账、订单查询等功能。具体实现细节可以根据实际需求进行调整。