Originally Posted by krk969

mainwindow.h

Code:

class MainWindow
{
........

private: 
 	static int  _clickCounter;
};

mainwindow.cpp
in the first line of the file just after all the #includes define this variable,

Code:

int MainWindow::_clickCounter = 0;

and modfiy your slot with something like this

Code:

void MainWindow::on_Button_clicked()
{
       ui->label->setText(QString("this is text %1").arg(QString::number(++_clickCounter) );
}