And in order not to post next thread, if I have a bool function, can I call return false; in few if() ? I mean:
Qt Code: 
  1. if (beaufortBox->isChecked() && beaufortBox_2->isChecked())
  2.           {
  3.                                    int ret = QMessageBox::Information(this, tr("Speed Units Converter"),
  4.                    tr("You can't convert value to the same unit"),
  5.                    QMessageBox::Ok | QMessageBox::Default);
  6.                    return false;                           
  7.           }
  8.  
  9.  if (beaufortBox_2->isChecked() && beaufortBox_3->isChecked())
  10.           {
  11.                                    int ret = QMessageBox::Information(this, tr("Speed Units Converter"),
  12.                    tr("You can't convert value to the same unit"),
  13.                    QMessageBox::Ok | QMessageBox::Default);
  14.                    return false;                           
  15.           }
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