QWidget widget;

widget.setWindowTitle(QObject::tr("k5"));

widget.resize(, );

widget.move(, );

widget.show();

int x = widget.x();

qDebug("x:%d", x);

int y = widget.y();

qDebug("y:%d", y);

// hellodialog.h

#ifndef HELLODIALOG_H

#define HELLODIALOG_H

#include <QDialog>

namespace Ui{

    class HelloDialog;

}

class HelloDialog : public QDialog{

    Q_OBJECT

public:

    explicit HelloDialog(QWidget* parent = nullptr);

    ~HelloDialog();

private:

    Ui::HelloDialog* ui;

};

#endif // HELLODIALOG_H

// hellodialog.cpp

#include "hellodialog.h"

#include "ui_hellodialog.h"

HelloDialog::HelloDialog(QWidget* parent) :

    QDialog(parent),

    ui(new Ui::HelloDialog)

{

    ui->setupUi(this);

}

HelloDialog::~HelloDialog()

{

    delete ui;

}

// main.cpp

#include "hellodialog.h"

#include <QApplication>

int main(int argc, char* argv[])

{

    QApplication a(argc, argv);

    HelloDialog w;

    w.show();

    return a.exec();

}

QDialog* dialog = new QDialog(this);

dialog->setModal(true);

dialog->show();

QDialog dialog;
dialog.setModal(true);
dialog.show()

QDialog* dialog = new QDialog(this);

dialog->show();

QDialog dialog;

dialog.show()

QDialog dialog;

if (dialog.exec() == QDialog::Accepted)