实现此功能的VB程序段如下,已知程序中两处标记①的位置表达式相同,程序中①、②两处表达式为( )
Dim a(1 To 100) As Sting
For i= 1 To 10
For j=1 To 10
If i=j Or i Mod 10=0 Or i Mod 10= 1
Then
a( ① )="●"
Else
a( ① )="○"
EndIf
Next j
Next i
For i= 1 To 100
s=s+ a(i)
If ② Then
List1.Addltem s
End If
Next i