主代码：

QWidget *window=new QWidget();	window->setWindowTitle("hello");	QSpinBox *spinBox=new QSpinBox();	QSlider *slider=new QSlider(Qt::Horizontal);	spinBox->setRange(100,1000);	slider->setRange(100,1000);	spinBox->setValue(100);	QObject::connect(slider,SIGNAL(valueChanged(int)),spinBox,SLOT(setValue(int)));	QObject::connect(spinBox,SIGNAL(valueChanged(int)),slider,SLOT(setValue(int)));	QHBoxLayout *layout=new QHBoxLayout();	layout->addWidget(spinBox);	layout->addWidget(slider);	window->setLayout(layout);	window->show();	return a.exec();