Qt simpel venstertje

#include <qapplication.h>
#include <qpushbutton.h>
#include <qfont.h>
#include <qlabel.h>
#include <qmessagebox.h>

class MyWidget : public QWidget
{
public:
    MyWidget( QWidget *parent=0, const char *name=0 );
private:
    QLabel * status;
public slots:
    void updatetext();
};


MyWidget::MyWidget( QWidget *parent, const char *name )
        : QWidget( parent, name )
{
    setMinimumSize( 200, 200 );
    setMaximumSize( 200, 200 );

    QPushButton *quit = new QPushButton( "Quit", this, "quit" );
    quit->setGeometry( 0, 0, 75, 30 );
    
    
    QPushButton *changetext = new QPushButton( "Change Text", this, "changetext" );
    changetext->setGeometry( 100, 100, 75, 30 );
    
    QLabel *status = new QLabel("Status Label", this, "status");
    status->setGeometry( 0, 100, 75, 30 );

    connect( changetext, SIGNAL(clicked()), qApp, SLOT(updatetext()) );
    connect( quit, SIGNAL(clicked()), qApp, SLOT(quit()) );
}

void MyWidget::updatetext()
{
    QMessageBox::information(this, "Notification", "Function initiated");
    status->setText("Done");
}
    
int main( int argc, char **argv )
{
    QApplication a( argc, argv );
    
    MyWidget w;
    w.setGeometry( 300, 300, 300, 300);
    a.setMainWidget( &w );
    w.show();
    return a.exec();
}

#include <qapplication.h>
#include <qpushbutton.h>
#include <qfont.h>
#include <qlabel.h>
#include <qmessagebox.h>
 
class MyWidget : public QWidget
{
public:
    MyWidget( QWidget *parent=0, const char *name=0 );
private:
    QLabel * status;
public slots:
    void updatetext();
};
 
 
MyWidget::MyWidget( QWidget *parent, const char *name )
        : QWidget( parent, name )
{
    setMinimumSize( 200, 200 );
    setMaximumSize( 200, 200 );
 
    QPushButton *quit = new QPushButton( "Quit", this, "quit" );
    quit->setGeometry( 0, 0, 75, 30 );
 
 
    QPushButton *changetext = new QPushButton( "Change Text", this, "changetext" );
    changetext->setGeometry( 100, 100, 75, 30 );
 
    QLabel *status = new QLabel("Status Label", this, "status");
    status->setGeometry( 0, 100, 75, 30 );
 
    connect( changetext, SIGNAL(clicked()), qApp, SLOT(updatetext()) );
    connect( quit, SIGNAL(clicked()), qApp, SLOT(quit()) );
}
 
void MyWidget::updatetext()
{
    QMessageBox::information(this, "Notification", "Function initiated");
    status->setText("Done");
}
 
int main( int argc, char **argv )
{
    QApplication a( argc, argv );
 
    MyWidget w;
    w.setGeometry( 300, 300, 300, 300);
    a.setMainWidget( &w );
    w.show();
    return a.exec();
}