Write a function that accepts a product code as an input string in the form XXX-

Question

Write a function that accepts a product code as an input string in the form XXX-YYY and validates it as follows: (1) The string length should be exactly 7 characters. (2) The first three characters (XXX) can be anything. (3) The fourth character should be a dash. (4) The last three characters (YYY) should be numeric digits. The output from this subroutine should be a Boolean value that is set to “True” if the product code is valid and “False” if the product code is not valid.   VB Question.

Sub MySub(ByVal W As Integer, ByRef M As Integer)

        M = W / 2

End Sub

Private Sub btn1_Click(…) Handles btn1.Click

        Dim X As Integer = 12, Y As Integer = 3

        Call MySub(X, Y)

        lstOutput.Items.Add("The value of Y is " & Y)

End Sub

The value of Y is 6

Explanation / Answer

Public Function Validate(str As String)

        If str.Length <> 7 Then
            Return False
        End If

        If str(3) <> "-" Then
            Return False
        End If

        For i As Integer = 4 To str.Length - 1
            If str(i) > "9" Or str(i) < "0" Then
                Return False
            End If
        Next

        Return True

    End Function

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