如何使用C++编写一个简单的电子商务平台？

#include <iostream>
#include <vector>

using namespace std;

// 商品类
class Product {
private:
    string name;
    float price;

public:
    Product(string n, float p) {
        name = n;
        price = p;
    }

    string getName() { return name; }

    float getPrice() { return price; }
};

// 用户类
class User {
private:
    string username;
    string password;
    vector<Product> cart;

public:
    User(string u, string p) {
        username = u;
        password = p;
    }

    string getUsername() { return username; }

    bool isPasswordCorrect(string p) { return password == p; }

    void addToCart(Product p) { cart.push_back(p); }

    void viewCart() {
        for (Product p : cart) {
            cout << p.getName() << " - $" << p.getPrice() << endl;
        }
    }

    void clearCart() { cart.clear(); }

    void checkout() {
        float total = 0.0;
        for (Product p : cart) {
            total += p.getPrice();
        }

        cout << "Total: $" << total << endl;
        cout << "Payment processed. Thank you for your purchase!" << endl;

        clearCart();
    }
};

// 平台类
class ECommercePlatform {
private:
    vector<User> users;
    vector<Product> products;

public:
    void registerUser(string username, string password) {
        User newUser(username, password);
        users.push_back(newUser);

        cout << "User " << username << " registered successfully." << endl;
    }

    // ...其他功能的实现

};

int main() {
    ECommercePlatform platform;

    // 注册用户
    platform.registerUser("user1", "password1");
    platform.registerUser("user2", "password2");

    // 创建商品
    Product product1("Product 1", 10.0);
    Product product2("Product 2", 20.0);
    Product product3("Product 3", 30.0);

    // 用户登录
    User& user1 = platform.login("user1", "password1");

    // 添加商品到购物车
    user1.addToCart(product1);
    user1.addToCart(product2);

    // 查看购物车
    user1.viewCart();

    // 结账
    user1.checkout();

    return 0;
}