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



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


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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.


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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.

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Dim strCardNum As String
Dim strSumNum As String


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May 4, 2012

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Function GetNextAvailableNumber(NumofDigits) as Long
'SQL Code Here ----
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Dim N(2) As Integer
N(0) = "0" & 1
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Apr 22, 2012

Ok, I have like this:

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basic_numbers(0) = 0
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Dim Product As Integer
Dim SumOfProducts As Integer


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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


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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Feb 6, 2012

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May 4, 2012

I found a good method of getting the next 4 digit number. How to find next free unique 4-digit number..But in my case I want to get next available 4 or 5 digit number.And this will change depending upon the users request. Theses number are not a key ID columns, but they are essential to the tagging structure for the business purpose. 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.[code]Numbers is the List of All available number from 0 to 99999, basically what's available to use. LineList is my final master table where I keep the long and all the relevant other business information.

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Sep 3, 2009

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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Nov 1, 2009

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Mar 14, 2009

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Jun 21, 2011

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Add sum of odd digits starting with first digit, then multiply by 3.

Add sum of even digits, then add to result of odd digits multiplied by 3.

Take result and divide by 10. The remainder is the check sum which needs to be added to the end of the original 11 digits.

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Jun 15, 2009

I'm looking for a way to take seven 2 digit numbers & combine them into one number to store in a database.The numbers represent hours for each day of the week & I only have one field to store them in. Then I need to be able to take the stored number & decode it back into the original seven numbers. Anyone have any clever ideas how I can do this?

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Jun 23, 2009

I am calling the function below from an Excel spreadsheet and the conversion from hex to decimal using the VAL function in the "manufacturer" variable below is coming back with a negative value.  The VBA edition is 6.5.

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May 29, 2012

I am trying to convert a ten digit phone number without dashes to one that includes dashes.

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the following code does absolutely nothing.

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Apr 26, 2009

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Each record gets currently saved as file under its item name. This sometimes causes problems because some item names contain special characters which can't be used as a file name. What I would like is the following: Whenever I 'add a record' to my database it should be saved in a file with a 4 to 6 digit number as file name - to keep things simple I just ignore the file extension for now.

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