Carl Bruiners Agile / IT Development Consultant

Carl Bruiners

I specialise in all things Agile (XP, Kanban, Lean), in particular Scrum. I have a passion for taking on 'problem' projects / teams and turning them into a sucess as well as promoting automated test driven practices.

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I am an enthusiastic, dedicated and accomplished Systems / application Architect, Project / Product Manager, Development Manager and Application Developer who thrives on delivering first class products.

My background is that of a developer who became a product / project manager and the head of application development. I am a certified SCRUM Master and have solid knowledge of PRINCE2.

I Work well on own initiative and can demonstrate high levels of motivation and organisation required to meet targets and deadlines. I have excellent interpersonal skills and communicate well at all levels.

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27Oct/091

VB.NET Luhn Check

As promised here is the VB.NET luhn check. As I haven't been able to carry out any work on my formatter yet, this will remain unformatting until complete.

Public Function luhnChk(ByVal ccNo As String) As Boolean
Dim i, w, a As Integer
Dim x As String
a = 0

ccNo = ccNo.Trim()
w = 2 * (Len(ccNo) Mod 2)

For i = Len(ccNo) - 1 To 1 Step -1
x = Mid(ccNo, i, 1)
If IsNumeric(x) Then
Select Case (i Mod 2) + w
Case 0, 3
a = a + CInt(x)
Case 1, 2
x = CInt(x) * 2
If x > 9 Then
a = a + (x  10) + (x - 10)
Else
a = a + x
End If
End Select
End If
Next
a = 10 - (a Mod 10)
If a > 9 Then a = 0
Return (CStr(a) = Right(ccNo, 1))
End Function

I haven't added in checking the first number/s validation, as I have found there to be an inconsistency as to what number/s are used on what card type (an example was that I was told by one bank that a Maestro card couldn't start with 67, only Solo, but I have a Maestro card that does!) 

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23Oct/090

Useful JavaScript Luhn Check

For those who work with handling credit card information you have either or soon will need to carry out a luhn check, below is a useful JavaScript luhn check;

< script type = "text/javascript" >//<![CDATA[
function checkCC(s) {
var i, n, c, r, t;
r = "";
for (i = 0; i < s.length; i++) {
c = parseInt(s.charAt(i), 10);
if (c >= 0 && c <= 9) r = c + r;
}
if (r.length <= 1) return false;
t = "";
for (i = 0; i < r.length; i++) {
c = parseInt(r.charAt(i), 10);
if (i % 2 != 0) c *= 2;
t = t + c;
}
n = 0;
for (i = 0; i < t.length; i++) {
c = parseInt(t.charAt(i), 10);
n = n + c;
}
if (n != 0 && n % 10 == 0) return true;
else return false;
}
function validateForm(f) {
var s = f.value;
if (checkCC(s)) alert("OK");
else alert("Please check your card number");
return false;
} 

//]]></script>

I haven't added in checking the first number/s validation, as I have found there to be an inconsistency as to what number/s are used on what card type (an example was that I was told by one bank that a Maestro card couldn't start with 67, only Solo, but I have a Maestro card that does!)

I'll be posting a vb.net and c# version soon, as I still can't believe how many of you Dev's rely completely on client side JS as your only validation method.

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