xy<int> osszeg;

 	typedef xy<int> XY;

 	xy<int> kul;

 	xy<int> z;

 	XY seged;

 	XY a(1,2);

 	XY b(3,4);

 	vector< xy<int> > v;

 	seged = a+b;

 	check(seged.x==4 && seged.y==6);

 	while(cin >> z) {

 		v.push_back(z);

 		osszeg += z;

 		kul -= z;

        		cout << "Az összeg aktualisan: " << osszeg << endl;

        		cout << "A különbség aktualisan: " << kul << endl;

 	}

 	cout << "A kovetkezo szamokat szoroztam ossze:" << endl;

 	seged = a-b;

 	for(unsigned int i=0; i<v.size(); ++i) {

 	check(seged.x==-1 && seged.y==-1);

 	  cout << v[i] << ", A normanégyzete: " << v[i].normSquare() <<endl;

 	  cout << v[i] << " " << s << " szorosa " << v[i]*s <<endl;

 	check(a.normSquare()==5);

 	  cout << v[i] << " " << s << " edrésze " << v[i]/s <<endl;

 	check(a*b==11);

 	}

 	if (v.size()>1){

 	int l=2;

 	  cout << "Az elsö kettö szorzata: " << v[0]*v[1] << endl;

 	seged = a*l;

 	}

 	check(seged.x==2 && seged.y==4);

 	cout << "Eleg nehez volt." << endl;

 	seged = b/l;

 	check(seged.x==1 && seged.y==2);

 	typedef BoundingBox<int> BB;

 	BB doboz1;

 	doboz1 += a;

 	doboz1 += b;

 	cout << (passed ? "All tests passed." : "Some of the tests failed!!!")

 	     << endl;

 	return passed ? 0 : 1;