<pre name="code" class="cpp">#include "mainwindow.h"
#include <QApplication>
#include <QDesktopWidget> int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show(); QDesktopWidget *desktop=QApplication::desktop();
w.resize(desktop->width()*3/4,desktop->height()*3/4);
w.move((desktop->width()-w.width())/2,
(desktop->height()-w.height())/2); return a.exec();
}