1.Hello QT

1 int main(int argc, char *argv[])
2 {
3     QApplication a(argc, argv);
4     MainWindow w;
5     w.show();
6     
7     return a.exec();
8 }

 1 #include <QtGui/QApplication>
 2 #include "MainWindow.h"
 3 
 4 int main(int argc, char *argv[])
 5 {
 6     QApplication a(argc, argv);
 7     MainWindow w;
 8     w.setWindowTitle("Hello World!");
 9     w.show();
10     
11     return a.exec();
12 }