public void actionPerformed(ActionEvent e) {
		String data = txtTall.getText();
		double tall = double.parseDouble(data);
		object kilde = e.getSource();
		String resultat;

		if (e.getSource() == btnKvadrat) {
			(txtTall * txtTall);
			} else {
		Math.sqrt(tall);
		}
		}
	}