$tab = mysqli_query($db, "SELECT imie FROM Osoby WHERE wiek < 18");

CREATE TABLE ksiazka (
 id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
 tytul VARCHAR(200),
 autor SMALLINT UNSIGNED NOT NULL,
 CONSTRAINT `dane` FOREIGN KEY (autor) REFERENCES autorzy(id)
);

<Label Text="5" BackgroundColor="Blue" TextColor="Tan" isVisible="True" />
<Stepper BackgroundColor="Blue" Value="5" isVisible="True" />
<Entry TextColor="Tan" BackgroundColor="Blue" Placeholder="5" />
<Slider ThumbColor="Tan" BackgroundColor="Blue" Value="5" isVisible="False" />

var napis1 = new napisy();

int x = 0;
while (x < 10)
{
    mojeKsiazki[x] = new Ksiazka();
    x++;
}

class KlasaBazowa {
    public:
        virtual void metoda() {
            cout << "Bazowa. ";
        }
};

class KlasaPochodna : public KlasaBazowa {
    public:
        void metoda() {
            cout << "Pochodna. ";
        }
};

int main() {
    KlasaBazowa *bazowa = new KlasaPochodna();
    KlasaPochodna *pochodna = new KlasaPochodna();

    bazowa->metoda();
    pochodna->metoda();
    return 0;
}