把这VB程序改写一下，考试题目，大家帮帮忙啊

来源：百度知道 编辑：UC知道 时间：2024/06/06 11:33:26
把程序里随即出现的30个大写的字母变成随即出现无论大小写和数字还有符号的程序！！！！！

Dim t As Date
Private Sub Command1_Click() '产生30个字母的范文
Randomize
Text1 = ""
For i = 1 To 30
a = Chr$(Int(Rnd * 26) + 65) '随机产生大写字母
Text1 = Left$(Text1, i - 1) + a '产生的字母连入范文框
Next i
End Sub

Private Sub Command2_Click()
End
End Sub

Private Sub Text2_GotFocus()
t = Time '键入文本框获得焦点,开始计时
End Sub

Private Sub Text2_KeyPress(KeyAscii As Integer)
If Len(Text2) = 30 Then '键入满30个字符
t2 = DateDiff("s", t, Time) '计算速度
Text3 = t2 & "秒" '显示速度
Text2.Locked = True '不允许再修改
y = 0: n = 0
For i = 1 To 30 '比较正确率
If Mid(Text1, i, 1) = Mid(Text2, i, 1) Then
y = y + 1
Else
n = n +

Dim t As Date
Private Sub Command1_Click() '产生30个字母和数字的范文
Dim b As Integer, c As Integer
Randomize
Text1 = ""
For i = 1 To 30
b = IIf(Rnd >= 0.5, 1, 0)
c = IIf(Rnd >= 0.5, 1, 0)
a = IIf(c = 1, Chr$(Int(Rnd * 26) + 65 + b * 32), Chr$(Int(Rnd * 10) + 48)) '随机产生字母和数字
Text1 = Left$(Text1, i - 1) + a '产生的字母和数字连入范文框
Next i
End Sub

Private Sub Command2_Click()
End
End Sub

Private Sub Text2_GotFocus()
t = Time '键入文本框获得焦点,开始计时
End Sub

Private Sub Text2_KeyPress(KeyAscii As Integer)
If Len(Text2) = 30 Then '键入满30个字符
t2 = DateDiff("s", t, Time) '计算速度
Text3 = t2 & "秒" '显示速度
Text2.Locked = True '不允许再修改
y = 0: n = 0
For i = 1 To 30 '比较