C++ GUI Qt入门

#include "mainwindow.h"
#include <QApplication>
#include <QHBoxLayout>
#include <QSlider>
#include <QSpinBox>
int main(int argc, char *argv[])
{
     QApplication app(argc, argv);
      QWidget *window = new QWidget;
      window->setWindowTitle("Enter Your Age");

      QSpinBox *spinbox = new QSpinBox;
      QSlider *slider = new QSlider(Qt::Horizontal);
      spinbox->setRange(0, 100);
      slider->setRange(0, 100);

      QObject::connect(spinbox, SIGNAL(valueChanged(int)),
                                       slider, SLOT(setValue(int)));
      QObject::connect(slider, SIGNAL(valueChanged(int)),
                               spinbox, SLOT(setValue(int)));
      spinbox->setValue(35);
      QHBoxLayout *layout = new QHBoxLayout;
      layout->addWidget(spinbox);
      layout->addWidget(slider);
      window->setLayout(layout);
      window->show();


      return app.exec();
}