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Validating a Card


Submitted on: 9/15/2003 3:58:26 PM
By: Danny J 
Level: Intermediate
User Rating: By 1 Users

Users have accessed this code 1143 times.

(About the author)
     This small function will validate a card. This uses Luhn (modulus 10). It can be a credit card, a sears card, a bestbuy card, or any big-shot company-customer card. This is pretty cool if you are making financial programs!
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Terms of Agreement:   
By using this code, you agree to the following terms...   
1) You may use this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.   
2) You MAY NOT redistribute this code (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws.   
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4) You will abide by any additional copyright restrictions which the author may have placed in the code or code's description.

    // Name: Validating a Card
    // Description:This small function will 
    //     validate a card. This uses Luhn (modulus
    //     10). It can be a credit card, a sears ca
    //     rd, a bestbuy card, or any big-shot comp
    //     any-customer card. This is pretty cool i
    //     f you are making financial programs!
    // By: Danny J
    //This code is copyrighted and has    // limited warranties.Please see http://
    //     www.Planet-Source-Code.com/vb/scripts/Sh
    //     owCode.asp?txtCodeId=1565&lngWId;=10    //for details.    //**************************************
    Public Function IsValid(ByVal strNumber As String) As Boolean
    Dim lngResult As Integer
    Dim lngTotal As Integer
    Dim intIndex As Short
    Dim i As Short
    Dim x As Short
    x = 1
    For i = Len(strNumber) To 1 Step -1
    lngResult = (CShort(Mid(strNumber, i, 1)) * x)
    If lngResult >= 10 Then
    lngTotal = lngTotal + (CShort(Mid(CStr(lngResult), 1, 1)) + CShort(Mid(CStr(lngResult), 2, 1)))
    lngTotal = lngTotal + lngResult
    End If
    If x = 2 Then x = 1 Else x = 2
    If lngTotal Mod 10 = 0 Then
    IsValid = True
    IsValid = False
    End If
    End Function

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Other User Comments
9/15/2003 4:00:08 PM:Danny J
Unfortunatly, PSC will not allow 
indenting. Sorry for the un-neatness.
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