Interface_demo.cpp

#include <iostream>
#include <memory>
#include <string>

// Abstract base class (interface)
class Chatbot {
public:
    virtual void hello() = 0;
    virtual void goodbye() = 0;
};

// English implementation
class EnglishChatbot : public Chatbot {
public:
    void hello() override {
        std::cout << "Hello!" << std::endl;
    }
    void goodbye() override {
        std::cout << "Goodbye!" << std::endl;
    }
};

// French implementation
class FrenchChatbot : public Chatbot {
public:
    void hello() override {
        std::cout << "Bonjour!" << std::endl;
    }
    void goodbye() override {
        std::cout << "Au revoir!" << std::endl;
    }
};

// Spanish implementation
class SpanishChatbot : public Chatbot {
public:
    void hello() override {
        std::cout << "¡Hola!" << std::endl;
    }
    void goodbye() override {
        std::cout << "¡Adiós!" << std::endl;
    }
};

int main() {
    std::unique_ptr<Chatbot> chatbot;
    std::string language;

    std::cout << "Which language do you want? (English/French/Spanish): ";
    std::cin >> language;

    if (language == "English") {
        chatbot = std::make_unique<EnglishChatbot>();
    }
    else if (language == "French") {
        chatbot = std::make_unique<FrenchChatbot>();
    }
    else if (language == "Spanish") {
        chatbot = std::make_unique<SpanishChatbot>();
    }
    else {
        std::cout << "Unknown language. Using English as default." << std::endl;
        chatbot = std::make_unique<EnglishChatbot>();
    }

    chatbot->hello();
    chatbot->goodbye();

    return 0;
}