下列VB程序运行时,单击命令按钮Command1后,标签框Label2中显示的内容是________Private Sub Command1_click()Dim s as integer,I as integerS=0For i="1" to 20 step 3s=s+(-1)^i*iNext iLabel1.caption=str(i)Label2.caption=str(s)End Sub
试题篮