using Gtk;

public const string[] label_text = {"Cool!", "Awesome!"};
public int label_text_iter = 0;
public Label label;

public void swap_label()
{
    label_text_iter++;
    if (label_text_iter > 1)
    {
        label_text_iter = 0;
    }
    label.set_text(label_text[label_text_iter]);
}

public static int main(string[] args)
{
    Gtk.init(ref args);
    var window = new Window();
    var hbox = new Box (Orientation.VERTICAL, 2);
    var button = new Button();
    label = new Label(label_text[label_text_iter]);
    button.set_label("Great!");
    hbox.add(label);
    hbox.add(button);
    window.add(hbox);
    window.title = "My first GTK program";
    window.set_default_size (350, 70);
    window.show_all();
    window.destroy.connect (Gtk.main_quit);
    button.clicked.connect(swap_label);
    Gtk.main();
    return 0;
}