2. 计算机
  3. 设有下面程序代码： Private Sub Command1_Click() Dim str As String, ch As String str = "Visual Basic Programming" ch = "a"

设有下面程序代码： Private Sub Command1_Click() Dim str As String, ch As String str = "Visual Basic Programming" ch = "a"

admin2015-06-30  72
问题 设有下面程序代码：
Private Sub Command1_Click()
    Dim str As String, ch As String
    str = "Visual Basic Programming"
    ch = "a"
    n = fun(ch, str)
    Print str, n
End Sub
Private Function fun(ch As String, str As String) As Integer
    Dim strbuf As String, c As String, n As Integer
    For k = 1 To Len(str)
        c = Mid$(str, k, 1)
        If c <> ch Then
            strbuf = strbuf & c
        Else
            strbuf = strbuf & UCase(c)
            n = n + 1
        End If
    Next k
    str = strbuf
    fun = n
End Function
程序运行时的输出是
选项 A、Visual Basic Programming     0
B、VisuAl BAsic ProgrAmming     3
C、Visul Bsic Progrmming     3
D、VisualBasicProgramming     2
答案B
解析 Mid$(A$,4,2)是为了与老版本的VB兼容（$的作用是强制将函数的返回值设为字符型）。&用来连接字符串。If条件判断字符是否和输入的字符相等，相等则n加1。选B）。
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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
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