迴文判斷

'迴文判斷
Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim rStr = ""
        Dim n() = {"12321", "1", "1221", "123454321", "12312", "12"}
        For m As Integer = 0 To UBound(n)
            Dim i = Int(Len(n(m)) / 2) + 1
            Dim isTrue = True

            Dim j = 1
            Dim k = Len(n(m))
            While j < i
                If Mid(n(m), j, 1) <> Mid(n(m), k, 1) Then isTrue = False
                j = j + 1
                k = k - 1
            End While
            rStr = rStr & n(m) & ":" & IIf(isTrue, "迴文", "非迴文") & vbNewLine
        Next
        MsgBox(rStr)
    End Sub
End Class