主代码：
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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();
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