#include <QApplication>
#include <QGuiApplication>

#include <QFont>
#include <QDoubleSpinBox>

#include <QWidget>
#include <QHBoxLayout>


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

  // spinbox too narrow on 4K screen under Windows 10
  QDoubleSpinBox *spinbox = new QDoubleSpinBox();
  spinbox->setRange(0.0,100.0);
  spinbox->setValue(100.0);

  // large font will cause spinbox to become taller, but too narrow for text
  QFont font(spinbox->font());
  font.setPixelSize(50);
  spinbox->setFont(font);

  QHBoxLayout *layout = new QHBoxLayout();
  layout->addStretch();
  layout->addWidget(spinbox);
  layout->addStretch();

  QWidget widget;
  widget.setLayout(layout);
  widget.show();

  return QApplication::exec();
}