#include <iostream>
using namespace std;

class Wektor {
public:
    Wektor(int n) : n(n) {
        ptr = new double[n];
        for(int i = 0; i < n; i++)
            ptr[i] = 0;
    }

    Wektor(const Wektor &w2) {
        n = w2.n;
        ptr = new double[n];
        for(int i = 0; i < n; i++)
            ptr[i] = w2.ptr[i];
    }

    virtual ~Wektor() {
        delete[] ptr;
    }

    double operator()(int i) const {
        return ptr[i];
    }

    double& operator()(int i) {
        return ptr[i];
    }


    Wektor operator*(double r) const {
        Wektor w2(n);
        for(int i = 0; i<n; i++)
            w2(i) = ptr[i]*r;
        return w2;
    }

    Wektor operator=(const Wektor &w2) {
        // zakladamy zgodny rozmiar!!!
        for(int i = 0; i < n; i++)
            ptr[i] = w2.ptr[i];
        return *this;
    }

	int rzad() const {
		return n;
	}

    friend ostream& operator<<(ostream &s, const Wektor &w);

private:
    int n;
    double * ptr;
};

ostream& operator<<(ostream &s, const Wektor &w) {
    s << "[";
    for(int i = 0; i < w.n; i++) {
        s << w.ptr[i];
        if(i != w.n-1)
            s << ", ";
    }
    s << "]";

    return s;
}


// --------------------------------

class Macierz {
public:
    Macierz(int n) : n(n) {
        ptr = new double[n*n];
        for(int i = 0; i < n*n; i++)
            ptr[i] = 0;
    }

    Macierz(const Macierz &m2) {
        n = m2.n;
        ptr = new double[n*n];
        for(int i = 0; i < n*n; i++)
            ptr[i] = m2.ptr[i];
    }

    virtual ~Macierz() {
        delete[] ptr;
    }
	
	int rzad() const {
		return n;
	}

    Macierz operator=(const Macierz &m2) {
        // zakladamy zgodny rozmiar!!!
        for(int i = 0; i < n*n; i++)
            ptr[i] = m2.ptr[i];
        return *this;
    }

    double operator()(int i, int j) const {
        return ptr[i*n+j];
    }

    double& operator()(int i, int j) {
        return ptr[i*n+j];
    }

    friend ostream& operator<<(ostream &s, const Macierz &w);

private:
    int n;
    double * ptr;
};

ostream& operator<<(ostream &s, const Macierz &w) {
    s << "[";
    for(int j = 0; j < w.n; j++) {
        for(int i = 0; i < w.n; i++) {
            s << w(i,j);
            if(i != w.n-1)
                s << ", ";
        }
        cout << endl;
    }
    s << "]";

    return s;
}






int main(int argc, char** argv)
{
  Wektor w(5);
  for(int i = 0; i < 5; i++)
      w(i) = i/2.;

  w = w*3;
  cout << w << endl;

  return 0;
}