【IF...THEN...语句】
If condition Then
[statements1]
else
[statements2]
end if
condition 为一个逻辑表达式，表示做选择时需要判别的条件，其结果为布尔类型，当其值为真时，执行statements1语句，为假是则执行ELSE中statements2语句
【代码区域】
Private Sub 测试if()
Dim age As Integer
age = InputBox("请输入年龄", "输入年龄窗口")
If (age >= ) Then
MsgBox "已经成年", vbOKOnly, "判断结果"
Else
MsgBox "未成年", vbOKOnly, "判断结果"
End If
End Sub
【IF嵌套语句】
IF condition Then
[statements1]
[Elseif condition2 then statements2]
[Elseif condition3 then statements3]
...
[Elseif conditionN then statementsN]
Else statements
End if
【代码区域】
Private Sub 测试if嵌套()
Dim age As Integer
age = InputBox("请输入年龄", "输入年龄窗口")
If (age <= ) Then
MsgBox "童年", vbOKOnly, "判断结果"
ElseIf ( < age And age <= ) Then
MsgBox "少年", vbOKOnly, "判断结果"
ElseIf ( < age And age <= ) Then
MsgBox "青年", vbOKOnly, "判断结果"
ElseIf ( < age And age <= ) Then
MsgBox "中年", vbOKOnly, "判断结果"
Else
MsgBox "老年", vbOKOnly, "判断结果"
End If
End Sub
【Select Case语句】
Select Case testexpression
[Case expressionlist - n]
[statements-n]...
[Case Else
[elsestatements]]
End Select
【代码区域】
Private Sub case测试()
Dim age As Integer
age = InputBox("请输入年龄", "输入年龄窗口")
Select Case age
Case To
MsgBox "童年", vbOKOnly, "判断结果"
Case To
MsgBox "少年", vbOKOnly, "判断结果"
Case To
MsgBox "青年", vbOKOnly, "判断结果"
Case To
MsgBox "中年", vbOKOnly, "判断结果"
Case Else
End Select
End Sub
【Tips】
在Select Case中需要注意上下界问题，例如："Case 0 to 6"表示6>=age>0