#include <iostream>
#include <cmath>
using namespace std;

class Vektor{
    double vx, vy;
  public:
    Vektor(double ux, double uy){
      vx=ux; vy=uy;              
    }
    double pikkus(){
      return sqrt(vx*vx+vy*vy);
    }
    double x(){return vx;}
    double y(){return vy;}
    Vektor* liida(Vektor* v){return new Vektor(vx+v->x(), vy+v->y());}
    Vektor* lahuta(Vektor* v){return new Vektor(vx-v->x(), vy-v->y());}
    Vektor* korruta(double k){return new Vektor(vx*k, vy*k);}
    double kaugus(Vektor* v){
      Vektor *abi=this->lahuta(v);
      double tulemus=abi->pikkus();
      free(abi);
      return tulemus;
    }
};

int main(void){
  Vektor *v1=new Vektor(4, 6);
  Vektor *v2=new Vektor(5, 7);
  Vektor *v3=v1->lahuta(v2);
  cout << v3->x() << " " << v3->y() << " " << v3->pikkus() << endl;
  cout << v1->kaugus(v2) << endl;
  return 0;    
}