题目

有如下程序段： s = "defghiabc" key = Text1.Text i = 1: j = Len(s) Do While i <= j     m = (i + j) \ 2     c = Mid(s, m, 1)     If c = key Then Exit Do     If Mid(s, i, 1) < c Then        If key >= Mid(s, i, 1) And key < c Then j = m - 1 Else i = m + 1     Else        If key > c And key <= Mid(s, j, 1) Then i = m + 1 Else j = m - 1     End If     ans = ans + Str(m) Loop 运行程序后，若在文本框Text1中输入字符"b"，则变量ans的值是（  ） A . 5 B . 5 7 8 C . 5 3 D . 5 7 答案：D

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