#include <QApplication>
#include <QPushButton>
#include <QCheckBox>
#include <QRadioButton>
#include <QMainWindow>
#include <QMenuBar>
#include <QVBoxLayout>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow window;
    window.menuBar()->addMenu("&File")->addAction("&Quit")->setEnabled(true);

    QWidget *centralWidget = new QWidget;
    window.setCentralWidget(centralWidget);

    QVBoxLayout *layout = new QVBoxLayout(centralWidget);

    QPushButton *button = new QPushButton("Push Button");
    QCheckBox *checkBox = new QCheckBox("Check Box");
    QRadioButton *radioButton = new QRadioButton("Radio Button");

    layout->addWidget(button);
    layout->addWidget(checkBox);
    layout->addWidget(radioButton);

    window.resize(300, 200);

    window.show();
    return QApplication::exec();
}