练习：输入5个整数，求平均值并显示。要 求使用InputBox和MsgBox函数（或过程 Dim i As Integer,total As Integer Dim strNum As String For i=1 To 5 ? totaltotal Val(strNum) Next i练习：输入5个整数，求平均值并显示。要 求使用InputBox 和MsgBox函数（或过程）。 Dim i As Integer, total As Integer Dim strNum As String For i = 1 To 5 ‘? total = total + Val(strNum) Next i ‘?