use Qt;
import Qt::app;
$hello = Qt::PushButton->new('Hello');
$hello->resize(100, 30);
$app->setMainWidget($hello);
$hello->show();
exit $app->exec();

##</code><code>##

use Qt;
use Qt::Object;
use Qt::Application;
use Qt::PushButton;
use Qt::Font;
import Qt::app;
$hello = Qt::PushButton->new('Hello');
$hello->resize(100, 30);
$app->setMainWidget($hello);
$hello->show();
exit $app->exec();