//define a classclass Engine{private: //the following varaibles/functions are only accessible within "Engine"	//private member variables:	int numberOfDevices;	int bpp;	//bits per pixel	//private member functions	void AddNewDevice() {numberOfDevices += 1;}public:	//the following variables/functions are accessible outside the class	//public member variables	unsigned int framesPerSecond;	//public member functions	Engine()	{	//this is a class "constructor", it's good for setting default values		numberOfDevices = 0;		bpp = 1;		framesPerSecond = 0;	}	int Initialize(int bitsPerPixel)	{		//set a private variable if it's valid due for its later usage		if (bitsPerPixel > 0 && bitsPerPixel <= 32)			bpp = bitsPerPixel;		else			return -1;	//return -1 to indicate there was an error		//call private function		AddNewDevice();		//everything went OK - return 0		return 0;	}};	//the class definition ends here//declare an instance of the class we defined, the constructor is calledEngine g_engine;int main(){	/*	the members of the class are accessed with the name of the class,		a dot and the name of the member*/	g_engine.Initialize(32);	//access the public variable of the class	g_engine.framesPerSecond = 60;	/*	POINT: now, if we were to access the private member variable bpp		the compiler wouldn't compile the program since it's not allowed*/	int iWantBppButCannot;	//the following line is not allowed!	//iWantBppButCannot = g_engine.bpp;	return 0;}