26.在窗体上画一个名称为TxtA的文本框,然后编写如下的事件过程: Private Sub TxtA_KeyPress(keyascii as integer) …… End Sub 若焦点位于文本框中,则能够触发KeyPress事件的操作是 A、单击鼠标 B、双击文本框 C、鼠标滑过文本框 D、按下键盘上的某个键
28.如果两个质数的差为2,就称这两个质数为质数对。下列程序代码输出100以内的质数对。 Private Sub Commandl_click( ) Dim i As Integer P1=Abc(3) For i=5 To 100 Step 2 p2=Abc(i) If____Then Print i-2,i P1=p2 Next I End Sub Public Function Abc(m As Integer)As Boolean Dim i As Integer Abc=True For i=2 To Int(Sqr(m)) If m Mod i=0 Then Abc=False:Exit For Next i End Function A、p1=p2 B、p1 And p2 C、p1,p2 D、p1 Or p2
A B C D
29.单击窗体时,下列程序代码的执行结果为____。 Private Sub Invert(xStr As String, yStr As String) Dim tempStr As String Dim I As Integer I = Len(xStr) Do While I > 1 tempStr = tempStr + Mid(xStr, I, 1) I = I - 1 Loop yStr = tempStr
End Sub
Private Sub Form_Click() Dim s1 As String, s2 As String s1 = "abcdef" Invert s1, s2 Print s2 End Sub A、abcdef B、afbecd C、fedcba D、defabc
A B C D
30.阅读程序: Sub subP(b() As Integer) For i = 1 To 4 b(i) = 2 * i Next i End Sub Private Sub Command1_Click() Dim a(1 To 4) As Integer Call subP(a()) For i = 1 To 4 Print a(i) Next i End Sub A、2 4 6 8 B、5 6 7 8 C、16 D、出错