Billing Management System in C++

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

using namespace std;

// Define a Product struct to represent products
struct Product {
    string name;
    double price;

    Product(const string& n, double p) : name(n), price(p) {}
};

// Define an Order struct to represent customer orders
struct Order {
    string productName;
    int quantity;

    Order(const string& n, int q) : productName(n), quantity(q) {}
};

// Function to calculate the total cost of an order
double calculateTotalCost(const vector<Product>& products, const vector<Order>& orders) {
    double totalCost = 0.0;

    for (const Order& order : orders) {
        for (const Product& product : products) {
            if (order.productName == product.name) {
                totalCost += order.quantity * product.price;
                break;
            }
        }
    }

    return totalCost;
}

int main() {
    vector<Product> products;
    vector<Order> orders;

    // Add some products to the system
    products.push_back(Product("Product1", 10.0));
    products.push_back(Product("Product2", 15.0));
    products.push_back(Product("Product3", 20.0));

    // Allow the user to create an order
    while (true) {
        string productName;
        int quantity;

        cout << "Enter product name (or 'exit' to finish): ";
        cin >> productName;

        if (productName == "exit") {
            break;
        }

        cout << "Enter quantity: ";
        cin >> quantity;

        orders.push_back(Order(productName, quantity));
    }

    // Calculate and display the total cost
    double totalCost = calculateTotalCost(products, orders);
    cout << "Total Cost: $" << totalCost << endl;

    return 0;
}