qt小程序

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hello:

#include <QApplication>

#include <QLabel>

int main(int argc, char *argv[])

{

QApplication app(argc, argv);

QLabel *label = new QLabel("Hello Qt!");

label->show();

return app.exec();

}

age:

#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(, );

    slider->setRange(, );

    QObject::connect(spinBox, SIGNAL(valueChanged(int)),

                     slider, SLOT(setValue(int)));

    QObject::connect(slider, SIGNAL(valueChanged(int)),

                     spinBox, SLOT(setValue(int)));

    spinBox->setValue();

    QHBoxLayout *layout = new QHBoxLayout;

    layout->addWidget(spinBox);

    layout->addWidget(slider);

    window->setLayout(layout);

    window->show();

    return app.exec();

}

quit:

#include <QApplication>

#include <QPushButton>

int main(int argc, char *argv[])

{

    QApplication app(argc, argv);

    QPushButton *button = new QPushButton("Quit");

    QObject::connect(button, &QPushButton::clicked, &QApplication::quit);

    button->show();

    return app.exec();

}