设有如下程序 Private Sub Search(a()As Variant,By Val key As Variant,index%) Dim I% For I=LBound(a) To UBound(a) If key=a(I) Then Index=I Exit Sub End If Next I Index=-1 End Sub Private Sub Form_Load() Show Dim b() As Variant Dim n As Integer b=Array(1,3,5,7,9,11,13,15) Call Search(b,11,n) print n End Sub 程序运行后，输出结果是______。