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Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
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Dim s As String = "0Ff0ajkh04624F"
Dim i As Integer = 0
Dim sTemp As String = ""
Dim ss As String = ""
For i = 1 To Strings.Len(s)
sTemp = Mid(s, i, 1)
If Asc(sTemp) = 65 And Asc(sTemp) = 90 Then
sTemp = LCase(sTemp)
ElseIf Asc(sTemp) = 95 And Asc(sTemp) = 122 Then
sTemp = UCase(sTemp)
Else
sTemp = sTemp
End If
ss = ss sTemp
Next
MsgBox(ss)
End Sub
'第一题
Private Sub Command1_Click()
a = InputBox("")
Select Case Asc(a)
Case Asc("a") To Asc("z")
Print UCase(a)
Case Asc("A") To Asc("Z")
Print LCase(a)
End Select
End Sub
'第二题
Private Sub Command1_Click()
a = Val(InputBox(""))
If (a Mod 4 = 0 And a Mod 100 0) Or a Mod 400 = 0 Then
Print a "是闰年"
Else
Print a "不是闰年"
End If
End Sub
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress e.KeyChar 使用参数e来控制输入字符 End Sub 追问: 能给出大小写切换程序的整段 源代码 吗 回答: 我不明白你的大小写切换程序是要实现什么功能 是输入 大写 变小写吗? 追问: 是的 回答: If e.KeyChar.IsLower(e.KeyChar) = True Then e.KeyChar.ToUpper(e.KeyChar) 或 If e.KeyChar.IsUpper(e.KeyChar) = True Then e.KeyChar.ToLower(e.KeyChar)