QT4:example3

#include <QApplication>
#include <QFont>
#include <QPushButton>
#include <QWidget>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWidget window;
    window.resize(200, 120);

    QPushButton quit("Quit", &window);
    quit.setFont(QFont("Times", 18, QFont::Bold));
    quit.setGeometry(10, 40, 180, 40);
    QObject::connect(&quit, SIGNAL(clicked()), &app, SLOT(quit()));

    window.show();
    return app.exec();
}