#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QGridLayout>
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
QWidget *widget = new QWidget();
QGridLayout *layout = new QGridLayout(widget);
QPushButton *button1 = new QPushButton("Button 1");
QPushButton *button2 = new QPushButton("Button 2");
QPushButton *button3 = new QPushButton("Button 3");
layout->addWidget(button1, 0, 0); // 第一行，第一列
layout->addWidget(button2, 0, 1); // 第一行，第二列
layout->addWidget(button3, 1, 0, 1, 2); // 第二行，从第一列开始，占据两列
widget->setLayout(layout);
widget->show();
return app.exec();
}
