if ("C".equals(arg)){
	wert1 =0.0d;
	rechenOperator = "";
	wert2 = 0.0d;
	text.setText("0");
	isFix = true;
} else if (("0".equals(arg)) | ("1".equals(arg)) | ("2".equals(arg))
| ("3".equals(arg)) | ("4".equals(arg)) | ("5".equals(arg)) | ("6".equals(arg)) | ("7".equals(arg)) | ("8".equals(arg)) | ("9".equals(arg)) | (".".equals(arg))){
	if (isFix){
		sText2 = (String) arg;
	} else {
		sText2 = text.getText() + arg;
	} text.setText(sText2);
	isFix = false;
}