Option Explicit
Option Base 1

Private Sub Command1_Click()
    Dim s$, pos%, j%, k%, a%(), i%
    s = Text1
        For i = 1 To 3
            For j = 1 To 3
                k = 0
                pos = pos + 1
                Do While Mid(s, pos, 1) <> "" And pos <= Len(s)
                    pos = pos + 1
                    k = k + 1
                Loop
                a(i, j) = Mid(s, pos - k, k)
                Text2 = Text2 & CStr(a(i, j)) & ""
            Next j
            Text2 = Text2 & vbCrLf
        Next i
End Sub
运行程序时红颜色的这句话，即a(i, j) = Mid(s, pos - k, k)总是提示“类型不匹配”，该如何改正呢，谢谢各位盟友了，我是南京农大学生，邮箱wsl1475548009@谢谢了。