#include <iostream>
using namespace std;

class TLightSource
{
  private:
    int lightState;

    virtual void Light(void) = 0;
    virtual void Dark (void) = 0;
    
  public:
    TLightSource() {lightState = 0;}
    void TurnOn (void) { if(!lightState) Light(); lightState = 1;}
    void TurnOff (void) { if(lightState) Dark(); lightState = 0;}
    int IsOn(void) {return (lightState != 0);}
};

class TTungstenBulb : public TLightSource
{
    private:
	int LightStrength;
        virtual void Light(void);
        virtual void Dark(void);
    public:
	TTungstenBulb(){LightStrength=100;}
	void SetStrength(int s){
		if(s<101 && s>-1){LightStrength=s;}	
	}
	
	int ShowStrength(void){
		return LightStrength;
	}
};

void TTungstenBulb::Light(void)
{
        cout << "Turning this tungsten bulb ON...\n";
}

void TTungstenBulb::Dark(void)
{
        cout << "Turning this tungsten bulb OFF...\n";
}

int main(void)
{
        TTungstenBulb MyLamp;
	int i;
	int t;
	
	i=1;

	while(i>0){
        	cout << "Current status: " << endl;
		if(MyLamp.IsOn()){
			cout << "The lamp is turned ON ..."<<endl;
			cout << "The light is at "<<MyLamp.ShowStrength()<<" %"<<endl;
		}else{
			cout<<"The lamp is turned OFF ..."<<endl;
		};
		cin>>i;
		switch(i){
			case 1: MyLamp.TurnOn();
				break;
			case 2: MyLamp.TurnOff();
				break;
			case 3: cout << "Sisesta valgustugevus: " << endl;
				cin >> t;
				MyLamp.SetStrength(t);
				break;
		};
	}

        return 0;
}