#include <iostream>

using namespace std;
template <typename T>

class My_Point{
    public:
T x;
T y;
Point(T x, T y) : x(x), y(y){};
My_Point(){
string wyjatek = "Wyjatek!";
throw wyjatek; }};

class My_Vector{
    public:
My_Point<T> a{0,0};
My_Point<T> b{1,1};
T dlugosc(){
return sqrt(pow((a.x-b.x),2)+pow((a.y-b.y),2));}

T getX(){
return a.x;}
T getY(){
return a.y;}
T getXb(){
return b.x;}
T getYb(){
return b.y;}

T iloczyn(My_Vector &R, My_Vector &M){
   return ((R.getXb-R.getX )*(M.getXb-M.getX))+((R.getYb-R.getY)*(M.getYb-M.getY)); }
};


int main()
{
    My_Point<int> A(1,2);
    My_Point<int> B(3,5);

    My_Point<int> A1(1,2);
    My_Point<int> B1(1,2);

    My_Vector<int> C(A,B);
    My_Vector<int> D(A1,B1);

    double g;
    double h;
    double j;
    g = C.dlugosc();
    h = D.dlugosc();
    j = C.iloczyn(C,D);

    cout<<"Dlugosc wektora 1: "<<g<<"\n";
    cout<<"Dlugosc wektora 2: "<<h<<"\n";
    cout<<"Iloczyn skalarny: "<<j<<"\n";

    return 0;
}