Macierz Macierz::operator* (Macierz const& ex)
{
    Macierz temp;

    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            temp.dane[i][j] = 0;
            for (int k = 0; k < 4; k++)
                temp.dane[i][j] += this->dane[i][k] * ex.dane[k][j];
        }
    }
    return temp;

}