题目

使用 VB 编写一个数字逆序功能的程序，在文本框 Text1 中输入若干整数，相互之间用逗号隔开，单击“开始逆序”按钮，在文本框 Text2 中输出逆序后的数字序列。程序运行界面如图所示，请改正划线处的错误语句使程序能正确运行。 Private sub Command1_click() Dim s1 As String, s2 As String, t As String, ch As String Dim i As Integer s1 = Text1.Text i = Len(s1) t = "": s2 = "" Do While i > 0     ch = Mid(s1, i, 1)     If ch >= "0" And ch <= "9" Then         t = ch + t     Else     s2 = s2 + t +，   ①     t = "" End If i = i + 1    ② Loop s2 = s2 + t Text2.Text = s2 End sub ① ②  答案：【1】s2 = s2 + t + ","【2】i = i – 1

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