a(1) = 2: a(2) = 2: a(3) = 5: a(4) = 6: a(5) = 7
Key = 2
i = 1: j = 5: flag = False Do While i <= j And Not flag
m = (i + j) \ 2 If Key = a(m) Then
s = "找到第" + Str(m) + "个" flag = True: Exit Do
ElseIf Key < a(m) Then j = m - 1
Else
i = m + 1 End If
s = Str(m) + s Loop Label1.Caption = s
执行该程序段后，在标签 Label1 中显示的内容是（ ）
