qt4：lay.cpp 布局、信号、槽的综合使用

#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, 130);
 slider->setRange(0, 130);
 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();
}