#include <qstring.h>
#include <qapplication.h>
#include <qpushbutton.h>

int main(int argc, char **argv)
{
    QApplication    app(argc, argv);
    QPushButton     quit("Hello World!");

    quit.resize(300, 40);
    quit.setFont(QFont("Arial", 18, QFont::Bold));
    QObject::connect(&quit, SIGNAL(clicked()), &app, SLOT(quit()));
    quit.show();

    return 0;
}

Switching to target: default
Linking executable: C:\Documents and Settings\*******\Mes documents\Programmation\c++\qt\QTapp.exe
C:\Program Files\CodeBlocks\bin\..\lib\gcc\mingw32\3.4.4\..\..\..\..\mingw32\bin\ld.exe: cannot find -lQtAssistantClient
collect2: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 3 seconds)