一个窗体单击事件过程如下： Private Sub Form_Click()  Dim a As Integer, b As Integer, c As Integer  a = 6 : b = 15  c = a * b  If a > b Then     a = a - b  Else     b = b - a  End If  Print a, b, c / bEnd Sub试问：当单击窗体后，输出为___________。