5-digit Credit Card Number With Fifth Digit As Check Digit

Apr 6, 2010

I just finished this application where you enter a five-digit credit card number, with the fifth digit being the check digit. everything seems to work except, I can't seem to get it to determine that any number is "valid". Every 5-digit combination that I enter returns "The credit card number is not valid". Im using visual basic 2008 express

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Make A App That Verifies A Five Digit Credit Card Number?

Oct 31, 2011

I need to make a app that verifies a five digit credit card number. The check digit is 5th and is found by multiplying the 2nd and 4th digit. Heres my current

Dim strInput As String
Dim strOutput As String
Dim intSumOfDigits As Integer

[code]....

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Sep 16, 2011

I'm supposed to write a program that validates an inputted ten digit ISBN number using the check-digit at the end to ensure that the sum is a multiple of eleven. Before calculating this and detecting if the entered number is indeed a valid ISBN, we're required to check the first nine digits and see if they are indeed integers. After this the tenth digit is checked to see if it is "X" (for ten) or 0-9.

With the code I've written it keeps returning false for whether or not the ISBN is valid, even with valid numbers. I feel like its something to do with the hyphens; have I misused the replace function?I'm a little lost on how to make my code work, but I'm fairly certain my logic is okay so far.

[Code]...

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VB - Georgetown Credit Card - When The Last 5th Digit Match The Sum Number At The Last Number - Isnt Working

Dec 10, 2010

I got most part correctly but the only part isnt working right is when the last 5th digit match the sum number at the last number.

Private Sub btnVerify_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnVerify.Click
Dim strCardNum As String
Dim strSumNum As String

[CODE]...

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Aug 12, 2011

i want a button to perform a function of checking the last digit number in a field of a table in and add a digit to it and display it in a textbox.

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May 4, 2012

I'm using Visual Studio and table adapters using an Access DB as the backend. I need the minimum 4 digit value. I want to get next available 4 or 5 digit number. And this will change depending upon the users request. Currently I use a table adabpter query. But how would I write a query. I suppose I could do a long iterative loop through all values until I see a 4 digit.But I'm trying to think of something more efficient.

Function GetNextAvailableNumber(NumofDigits) as Long
'SQL Code Here ----
'Query Number Table

[code]....

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May 28, 2011

I'm making a project that randomly picks a number from an array, but if it picks a number less than 10 then the number is a single instead of a double.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim N(2) As Integer
N(0) = "0" & 1
N(1) = "0" & 2
N(2) = "0" & 3

[Code]...

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Apr 22, 2012

Ok, I have like this:

Public basic_numbers(10) As Integer
basic_numbers(0) = 0
basic_numbers(1) = 1

[code].....

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Nov 6, 2009

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Dim Product As Integer
Dim SumOfProducts As Integer

[code]....

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Apr 27, 2010

I am working on a check digit program and I am having some trouble finding the best path to take. The program requires 5 digits (numbers). I am calling them

num1
num2
num3
num4
num5

My ultimate goal is to use this equation:

num5 = num1 + (num2 *2) + num3 + (num4*2) - but I use the second digit of the resulting number.

Example: number 12346 - would be "correct!"

12345 - would be "wrong!"

1 + (2*2=4) + 3 + (4*2=8) = 16 so the correct would be 12346 When the user puts in the numbers on the UI I will be returning a comment in a text box on the UI.Which direction should I start?

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May 4, 2012

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I'm trying to calculate the ISBN check digit of a number. First I have to remove all dashes from the ISBN; the rult is a 10-digit interger. For example 0-619-15934-0 becomes 0619159340. Then apply a weight factor to each of the first nine digits and sum the weighted numbers. AThe weight factor is the digit's position in the ISBN. THat is, the first digit is multiplied by 1, the second by 2, etc. Finnally I have to compute the check digit as the mod 11 modulus of this number for example. 209 mod 11 = 0 (i.e., 209/11 = 19, remainder 0_ This is the check digit. If the remainder is 10 ten the check digit is 0. Once the check digit has been calculated, it can be compared to the check digit given with an ISBN to determine if the ISBN is correct, or appended to a new ISBN as its check digit.[code]THe first problem arises when it tells me to make sure I enter all numbers when I should be deleting the dashes and then making sure that the contents are numeric. But even without it and without entering dashes the program still blows up.

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12 -> 10
152 -> 200
1538 -> 2000
25000 -> 30000
etc.

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Public Function GetHexColor(colorObj As System.Drawing.Color) As String
Return Hex(colorObj.R) & Hex(colorObj.G) & Hex(colorObj.B)
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Feb 10, 2009

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dim a as double = 1111111111111111111111111111111111111
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[code]....

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Public Function decMEID(ByVal sKey As String) As String
Dim manufacturer As String
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[code].....

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