Security System Friend Class

Create two classes SecuritySystem and ControlPanel.

The SecuritySystem class should have the private members: bool isArmed, and bool alarmTriggered

The ControlPanel class should contain a pointer to a SecuritySystem object and be declared as a friend of SecuritySystem. The ControlPanel class should have methods to:

armSystem(): Arms the security system.
disarmSystem(): Disarms the security system.
triggerAlarm(): Triggers the alarm if the system is armed.
checkStatus(): Displays whether the system is armed and whether the alarm is triggered.

In main(), create a SecuritySystem object and then create a ControlPanel object that manages this SecuritySystem through a pointer. Use the ControlPanel object to manage the system's state by arming, disarming, triggering the alarm, and checking the status.

Hint

The ControlPanel class should have access to the private members of SecuritySystem through the friend class relationship.
The ControlPanel should have a constructor that takes a pointer to a SecuritySystem object.

Answer

#include <iostream>

class SecuritySystem {
private:
    bool isArmed;
    bool alarmTriggered;

public:
    SecuritySystem() : isArmed(false), alarmTriggered(false) {}

    // Declare ControlPanel as a friend class
    friend class ControlPanel;
};

class ControlPanel {
private:
    SecuritySystem* system;  // Pointer to a SecuritySystem object

public:
    // Constructor that takes a pointer to a SecuritySystem object
    ControlPanel(SecuritySystem* sys) : system(sys) {}

    void armSystem() {
        system->isArmed = true;
        system->alarmTriggered = false;
        std::cout << "Security system armed." << std::endl;
    }

    void disarmSystem() {
        system->isArmed = false;
        system->alarmTriggered = false;
        std::cout << "Security system disarmed." << std::endl;
    }

    void triggerAlarm() {
        if (system->isArmed) {
            system->alarmTriggered = true;
            std::cout << "Alarm triggered!" << std::endl;
        } else {
            std::cout << "System is not armed. Cannot trigger alarm." << std::endl;
        }
    }

    void checkStatus() {
        std::cout << "Security System Status:" << std::endl;
        std::cout << "Armed: " << (system->isArmed ? "Yes" : "No") << std::endl;
        std::cout << "Alarm Triggered: " << (system->alarmTriggered ? "Yes" : "No") << std::endl;
    }
};

int main() {
    SecuritySystem myHomeSecurity;
    ControlPanel myControlPanel(&myHomeSecurity);  // Pass pointer to ControlPanel

    myControlPanel.checkStatus();
    myControlPanel.armSystem();
    myControlPanel.checkStatus();
    myControlPanel.triggerAlarm();
    myControlPanel.checkStatus();
    myControlPanel.disarmSystem();
    myControlPanel.checkStatus();

    return 0;
}

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