[填空题] 下面程序运行后，单击命令按钮，输出的结果是 【12】
Private Sub Command1_Click()
Dim a%(1 To 4)，b%(2 To 6)，i%，str1#，str2#
For i=1 To 4
a(i)=i
Next
For i=2 To 6
b(i) =i
Next
str1 = YAG(a)
str2 = YAG(b)
Print "str1 ="; str1; "str2 ="; str2
End Sub
Function YAG (a ( ) As Integer)
Dim t#, i%
t=1
For i = LBound(a) To UBound(a)
t=t * a(i)
Next
YAG = t
End Function