private void clear_buttActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        num_text.setText("");
        out_text.setText("");
    }

    private void exit_buttActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
                System.exit(busyIconIndex);
    }

    private void out_textActionPerformed(java.awt.event.ActionEvent evt) {

    }

    private void fact_buttActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:

        //Declare variables
        String fact_out;
        int total, k, num;

        //initiliaze for invalid data
        num = 1;

        if ((num_text.getText().equals("")))
        { num_text.setText("");

        //put error message out
        JOptionPane.showMessageDialog(null, "Lack of information!", "Error message", JOptionPane.ERROR_MESSAGE );
    }

        else
        {

        //get the information off the form
        num = Integer.parseInt(num_text.getText());

        //Calculate
        total = 1;
        for (k = 1; k <= num; k++)
        total = total * k;


       //Put results on forum
       out_text.setText(String.valueOf(num) + "! is equal to " + String.valueOf(total) );

       if ((num <0))
           { num_text.setText("");
             out_text.setText("");
        //put error message out
        JOptionPane.showMessageDialog(null, "You entered a negative number", "Error message", JOptionPane.ERROR_MESSAGE );

           }



        }