Simple Qt Test

main.cpp

#include <QApplication>
#include <QLabel>
#include <QPushButton>
#include <QSpinBox>
#include <QSlider>
#include <QHBoxLayout>

int main(int argc, char *argv[]) {
    QApplication *application = new QApplication(argc, argv);

    // Part I
    QLabel *label = new QLabel("This is a <b>Qt label</b> testing <i>window</i>.");
    label->show();

    // Part II
    QPushButton *button = new QPushButton("Quit this Qt application immediately.");
    QObject::connect(button, SIGNAL(clicked()), application, SLOT(quit()));
    button->show();

    // Part III
    QSpinBox *spinBox = new QSpinBox;
    spinBox->setRange(0, 130);
    QSlider *slider = new QSlider(Qt::Horizontal);
    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);

    QWidget *window = new QWidget;
    window->setWindowTitle("Qt Window Title");
    window->setLayout(layout);
    window->show();

    return application->exec();
}