//uzyty konstruktor
        matrix(unsigned int n_rows, unsigned int n_cols, element** tab) {
            cols = n_cols;
            rows = n_rows;
            element** body = new element* [rows];
            for (int i = 0; i < rows; i++) {
                body[i] = new element [cols];
                for (int j = 0; j < cols; j++) {
                    body[i][j] = tab[i][j];
                }
            }
        }

//wywołanie razem ze stworzeniem tablicy
 complexNumber** tabA = new complexNumber* [3];
    for (int i = 0; i < 3; i++) {
        tabA[i] = new complexNumber[2];
        for (int j = 0; j < 2; j++){
            complexNumber tmp((10 + static_cast <float> (rand()) /( static_cast <float> (RAND_MAX/(10-20)))),
                              (10 + static_cast <float> (rand()) /( static_cast <float> (RAND_MAX/(10-20)))));
            tabA[i][j] = tmp;
        }
    }
    matrix<complexNumber> matA(3, 2, tabA);