split与 UBound() 用法疑惑 请高手指点

Dim S As String,A
S="jdifeuA34dke334"
A=Split(S,"A") '区分大小写的时候
'A=Split(Ubound(S),"A") '不区分大小写的时候
For i=1 to ubound(A)
If Len(A(i))>0 Then
Print Val(A(i))
End If
Next

Private Sub Command1_Click()
Dim S As String, S2 As String, A
S = "jdifeuA34dke334"
A = Split(S, "A") '区分大小写的时候
'A=Split(Ubound(S),"A") '不区分大小写的时候
For i = 0 To UBound(A)
If Len(A(i)) > 0 Then
For j = 1 To Len(A(i))
If Mid(A(i), j, 1) >= "0" And Mid(A(i), j, 1) <= "9" Then
S2 = S2 & Mid(A(i), j, 1)
Else
Exit For
End If
Next
If S2 <> "" Then Print Val(S2)
S2 = ""
End If
Next
End Sub

两段代码调试时,
第一个的for 循环是1->2 而A的下标刚好是1->2
第二个的for 循环是0->1 而A的下标刚好是0->1

A的下标为什么自动实应了循环的需求,要1-2时就是

求解asp中split和ubound结合后产生的效果 ASP，关于Split 与 Checkbox UBound()的疑问 split是什么意思？ split monopole split time VB中ubound（）是什么意思啊？ ASP中关于UBOUND的理解 类型不匹配: 'UBound' 0 to ubound checked 复选框