a(1) = 11 : a(2) = 14 : a(3) = 23 : a(4) = 23 : a(5) = 30 : a(6) = 42
key = Val(Text1.Text)
L = 1 : R = 6 : x = 0
Randomize
Do while L <= R
mid = Int(Rnd() * (R-L+1))+ L
If a(mid) = key Then
Exit Do
ElseIf a(mid) > key Then
R = mid - 1
x = x - 1
Else
L = mid + 1
x = x + 1
End If
Loop
If L <= R Then
Label1.Caption = "查找成功，" + "位置为" + str(mid)
Else
Label1.Caption = "查找失败"
End If
该程序执行后，在文本框Text1中输入23，则x的值不可能是（ ）
