网上购物系统代码实现及运行结果c

很抱歉，因为您的问题比较广泛，无法给出详细的代码实现及运行结果。下面是一个简单的网上购物系统的思路和部分代码实现，供您参考。

1. 用户注册登录

用户可以通过注册账号来实现登录，账号信息可以存储在本地文件或数据库中。用户登录后可以进行购物、查看订单等操作。

2. 商品展示

系统需要展示所有商品信息，包括商品名称、价格、库存量、图片等。可以将商品信息存储在本地文件或数据库中，并通过读取文件或查询数据库来实现商品展示。

3. 购物车

用户可以将商品加入购物车，系统需要记录用户选择的商品信息、数量、价格等。购物车可以存储在本地文件或数据库中，用户可以在购物车中查看已选择的商品信息。

4. 订单管理

用户可以提交订单并进行支付，系统需要记录订单信息、支付状态、收货地址等。订单信息可以存储在本地文件或数据库中，用户可以查看订单状态、收货地址等信息。

下面是一个简单的购物系统代码示例：

#include <iostream>
#include <string>
#include <vector>

using namespace std;

struct Product {
    string name;
    double price;
    int stock;
};

struct Order {
    int id;
    vector<Product> products;
    double total;
    string address;
    bool paid;
};

class ShoppingCart {
private:
    vector<Product> products;
public:
    void addProduct(Product p) {
        products.push_back(p);
    }
    void removeProduct(int index) {
        products.erase(products.begin() + index);
    }
    void display() {
        cout << "Shopping Cart:" << endl;
        for (int i = 0; i < products.size(); i++) {
            cout << i+1 << ". " << products[i].name << " $" << products[i].price << endl;
        }
    }
    double getTotal() {
        double total = 0;
        for (int i = 0; i < products.size(); i++) {
            total += products[i].price;
        }
        return total;
    }
    vector<Product> getProducts() {
        return products;
    }
};

class OrderManager {
private:
    vector<Order> orders;
public:
    void addOrder(Order o) {
        orders.push_back(o);
    }
    void displayOrders() {
        cout << "Orders:" << endl;
        for (int i = 0; i < orders.size(); i++) {
            cout << "Order #" << orders[i].id << " Total $" << orders[i].total << " Address " << orders[i].address << " Paid " << orders[i].paid << endl;
        }
    }
    void markPaid(int index) {
        orders[index].paid = true;
    }
    vector<Order> getOrders() {
        return orders;
    }
};

class ProductManager {
private:
    vector<Product> products;
public:
    void addProduct(Product p) {
        products.push_back(p);
    }
    void displayProducts() {
        cout << "Products:" << endl;
        for (int i = 0; i < products.size(); i++) {
            cout << i+1 << ". " << products[i].name << " $" << products[i].price << " Stock " << products[i].stock << endl;
        }
    }
    vector<Product> getProducts() {
        return products;
    }
};

class UserManager {
private:
    string username;
public:
    UserManager(string u) {
        username = u;
    }
    string getUsername() {
        return username;
    }
};

void printMainMenu(UserManager user, ProductManager productManager, ShoppingCart cart, OrderManager orderManager) {
    cout << "Welcome " << user.getUsername() << endl;
    cout << "1. Display products" << endl;
    cout << "2. Add product to cart" << endl;
    cout << "3. Remove product from cart" << endl;
    cout << "4. View cart" << endl;
    cout << "5. Checkout" << endl;
    cout << "6. View orders" << endl;
    cout << "7. Mark order as paid" << endl;
    cout << "8. Exit" << endl;
}

int main() {
    UserManager user("test");
    ProductManager productManager;
    ShoppingCart cart;
    OrderManager orderManager;
    int choice;
    while (true) {
        printMainMenu(user, productManager, cart, orderManager);
        cin >> choice;
        switch (choice) {
            case 1:
                productManager.displayProducts();
                break;
            case 2:
                productManager.displayProducts();
                int index;
                cout << "Enter product number to add to cart: ";
                cin >> index;
                cart.addProduct(productManager.getProducts()[index-1]);
                break;
            case 3:
                cart.display();
                cout << "Enter product number to remove from cart: ";
                cin >> index;
                cart.removeProduct(index-1);
                break;
            case 4:
                cart.display();
                cout << "Total $" << cart.getTotal() << endl;
                break;
            case 5:
                Order o;
                o.id = orderManager.getOrders().size() + 1;
                o.products = cart.getProducts();
                o.total = cart.getTotal();
                cout << "Enter address: ";
                cin >> o.address;
                o.paid = false;
                orderManager.addOrder(o);
                cout << "Order #" << o.id << " submitted" << endl;
                cart = ShoppingCart();
                break;
            case 6:
                orderManager.displayOrders();
                break;
            case 7:
                orderManager.displayOrders();
                cout << "Enter order number to mark as paid: ";
                cin >> index;
                orderManager.markPaid(index-1);
                break;
            case 8:
                return 0;
            default:
                cout << "Invalid choice" << endl;
                break;
        }
    }
    return 0;
}

这只是一个简单的示例，实际的购物系统需要更复杂的功能和更完善的代码实现。