题库 高中信息
题干
小明用VB程序编写了一个密码生成器，单击“生成密码”按钮生成一个8位数的密码，该密码必须同时包含数字、大写字母和小写字母，并在文本框Text1中显示。程序界面如下图所示。
（1）在设计程序界面时，要将文本框Text1中的内容清空，应修改该文本框的 属性。
（2）实现上述功能的VB程序如下，请在划线处填入合适代码。
Private Sub Command1_Click()
Const n = 8
Dim s As String
Dim a As Integer, i As Integer
Dim x As Boolean, y As Boolean, z As Boolean
x = False
y = False
z = False
Randomize
Do While ①
s = ""
For i = 1 To n
a = Int(Rnd() * 62) + 1
If a <= 10 Then
x = True
s = s + Chr(a + Asc("0") - 1)
ElseIf a <= 36 Then
y = True
s = s + Chr(a + Asc("A") - 11)
Else
z = True
②
End If
Next i
Loop
Text1.Text = ③
End Sub
（1）在设计程序界面时，要将文本框Text1中的内容清空，应修改该文本框的 属性。
（2）实现上述功能的VB程序如下，请在划线处填入合适代码。
Private Sub Command1_Click()
Const n = 8
Dim s As String
Dim a As Integer, i As Integer
Dim x As Boolean, y As Boolean, z As Boolean
x = False
y = False
z = False
Randomize
Do While ①
s = ""
For i = 1 To n
a = Int(Rnd() * 62) + 1
If a <= 10 Then
x = True
s = s + Chr(a + Asc("0") - 1)
ElseIf a <= 36 Then
y = True
s = s + Chr(a + Asc("A") - 11)
Else
z = True
②
End If
Next i
Loop
Text1.Text = ③
End Sub
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