#include #include using namespace std; // Subsystem: Controls smart lights in the house class SmartLightsSystem { public: void on() { cout << "Lights: Turned on." << endl; } void off() { cout << "Lights: Turned off." << endl; } }; // Subsystem: Controls the thermostat temperature and mode class Thermostat { string mode; public: void setTemperature(int degrees) { cout << "Thermostat: Mode set to " << mode << ". Temperature set to " << degrees << "C." << endl; } void setMode(const string& mode) { this->mode = mode; } }; // Subsystem: Controls the home security system class SecuritySystem { public: void arm() { cout << "Security: System armed." << endl; } void disarm() { cout << "Security: System disarmed." << endl; } }; // Facade: Provides simplified methods to control all smart home subsystems class SmartHomeFacade { SmartLightsSystem& lights; Thermostat& thermostat; SecuritySystem& security; public: SmartHomeFacade(SmartLightsSystem& lights, Thermostat& thermostat, SecuritySystem& security) : lights(lights), thermostat(thermostat), security(security) {} void leaveHome() { cout << "--- Leaving Home ---" << endl; lights.off(); thermostat.setMode("eco"); thermostat.setTemperature(18); security.arm(); cout << "--- Home secured ---" << endl; } void arriveHome() { cout << "--- Arriving Home ---" << endl; lights.on(); thermostat.setMode("comfort"); thermostat.setTemperature(22); security.disarm(); cout << "--- Welcome home! ---" << endl; } }; int main() { SmartLightsSystem lights; Thermostat thermostat; SecuritySystem security; SmartHomeFacade home(lights, thermostat, security); home.leaveHome(); cout << endl; home.arriveHome(); return 0; }

Exercise: Facade Design Pattern

Exercise 1: Smart Home Controller

Exercise 2: Travel Booking System

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