Gt QHBoxLayout and slot example C++

Qt Layout and Slot.cpp

#include <QtGui/QApplication>
#include <QtGui/QPushButton>
#include <QtGui/QWidget>
#include <QtGui/QSpinBox>
#include <QtGui/QSlider>
#include <QtGui/QHBoxLayout>

int main(int argc, char *argv[])
{
    QApplication a(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(slider,SIGNAL(valueChanged(int)), spinBox, SLOT(setValue(int)));
    QObject::connect(spinBox,SIGNAL(valueChanged(int)), slider, SLOT(setValue(int)));

    spinBox->setValue(35);

    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(spinBox);
    layout->addWidget(slider);
    window->setLayout(layout);

    window->show();

    return a.exec();
}