uml_sequence.cpp

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

class Book {
public:
    std::string title;
    double price;
    Book(std::string t, double p) : title(t), price(p) {}
};

class ShoppingCart {
private:
    std::vector<Book> books;
public:
    void addBook(const Book& book) {
        books.push_back(book);
        std::cout << book.title << " added to the cart.\n";
    }
    double getTotal() {
        double total = 0.0;
        for (auto& book : books) {
            total += book.price;
        }
        return total;
    }
};

class PaymentProcessor {
public:
    bool processPayment(double amount) {
        std::cout << "Processing payment: $" << amount << "\n";
        // Simplification: Assume payment always succeeds
        return true;
    }
};

class Bookstore {
public:
    Book searchBook(std::string title) {
        // Simplification: Assume the book is always found
        std::cout << "Book found: " << title << "\n";
        return Book(title, 10.0); // Example book
    }
};

class User {
private:
    ShoppingCart cart;
public:
    void searchAndAddBook(Bookstore& store, std::string title) {
        Book book = store.searchBook(title);
        cart.addBook(book);
    }
    void checkout(PaymentProcessor& processor) {
        double total = cart.getTotal();
        if (processor.processPayment(total)) {
            std::cout << "Payment successful. Checkout complete.\n";
        } else {
            std::cout << "Payment failed.\n";
        }
    }
};

int main() {
    Bookstore store;
    PaymentProcessor processor;
    User user;
    
    user.searchAndAddBook(store, "C++ for Beginners");
    user.checkout(processor);
    
    return 0;
}