//main.cpp
#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QLayout>
#include <QDebug>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QWidget win;
    win.resize(300, 200);
    win.setWindowTitle("Хелло, Deema");

    QPushButton button("Hello perdoliques");
    QObject::connect(&button, &QPushButton::clicked, &app, &QCoreApplication::quit);
    QObject::connect(&button, &QPushButton::clicked, [](){
        qDebug() << "Вечер в хату";
    });

    QVBoxLayout lay;
    lay.setAlignment(Qt::AlignHCenter);
    lay.addWidget(&button);

    win.setLayout(&lay);
    win.show();

    return app.exec();
}