填空题 运行程序，当窗体加载事件发生：
Private Sub Form_Load( )
Dim b As Single
Dim t as Integer
t=0
b=20
Do
t=t+1
b=b/2
Loop Until b＜0.5
MsgBox b
MsgBox"共循环了"＆t＆"次"
End Sub
此程序运行结果为______。