以下程序段所对应的函数表达式是 ???
Private Sub Form_click()
x = InputBox("enter an integer")
x = clnt(x)
Select Case x
Case Is <= 0
y = 0
Case Is <= 10
y = 5 + 2 * x
Case Is <= 15
y = x - 5
Case Is > 15
y = 0
End Select
End Sub
请说详细点,谢谢