设有如下程序： Private Sub Inv(ByVal xStr As String, yStr As String) Dim tStr As String Dim L As Integer L = Len(xStr)

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问题设有如下程序：
Private Sub Inv(ByVal xStr As String, yStr As String)
Dim tStr As String
Dim L As Integer
L = Len(xStr)
Do While L >= 1
tStr = tStr + Mid(xStr, L, 1)
L = L - 1
Loop
yStr = tStr
End Sub
Private Sub Form_Click()
Dim S1 As String, S2 As String
S1 = "abcdef"
Inv S1, S2
Print S2
End Sub
运行程序，单击窗体，输出结果为

选项 A、abcdef
B、afbecd
C、fedcba
D、defabc

答案C

解析 Mid函数将返回字符串中从L开始的一个字符，L从字符串长度反向递减。因此Inv函数实现字符串翻转功能。选C。

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本试题收录于：二级VB题库NCRE全国计算机二级分类