下标越界

下标越界!在线等
For   i   =   0   To   UBound(a())
提示下标越界,怎么回事?

[解决办法]
For i = 0 To UBound(a())
提示下标越界,怎么回事?

因为数组a还未真正定义过大小。

象这样，就会提示下标越界:
Dim a() As Integer
For i = 0 To UBound(a())

象这样，就不会提示下标越界:
Dim a() As Integer
Redim a(10)
For i = 0 To UBound(a())