单项选择题
在窗体中添加一个名称为Command1的命令按钮，然后编写如下事件代码：
Private Sub Command1_Click()
MsgBox f(24,18)
End Sub
Public Function f(m As Integer，n As Integer)As Integer
Do While m<>n
Do While m>n
m ＝ m－n
Loop
Do While m