Check The Digit Code?
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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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
[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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Nov 6, 2009
i'm trying to calculate the check digit for a scan line. my problem is it needs to be weighted 2121, right to left. so what i have to do is take each character in the string and convert it to it's ASCII equivalent then multiply that by either a 2 or 1 depending on the position of the character. how can i alternate the 2 to a 1 after each character?
Dim Product As Integer
Dim SumOfProducts As Integer
[code]....
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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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Apr 2, 2012
I would like to covert a 4 digit hexadecimal code point to UTF8.
For example:
4e00 to 一
Dim s1 As String = Char.ConvertFromUtf32(&H28E02)
I don't think they are built for my 4 digit code though.
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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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Mar 19, 2010
I am trying to format a Function Code so that it returns a 4 digit result no matter the entry by the user (i.e. they enter 540, stores 0540 in the database). While looking online, I've found the format function, but when I use it, it returns 540, regardless if I enter 540 or 0540. [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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Mar 11, 2010
Is there any code that will make possible check if the user typed a word i want in order to show him something ? something like , if the user types time , or tim or timing or the word time and transformated to show him up the time ..
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Jun 8, 2010
i'm working on a system that upgrades a basic version to a proversion but i have a payment gateway . it generates a code in an SQL DB.now i have a form in VB that has a textbox and a button how can i let VB connect to my SQL DB receive the code and then check if that code is correct and if its correct download silence the pro file. from an url.
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Aug 31, 2010
I am Doing Spell Check for multiple Text box in VB6.0,the Spell Check is working but the Screen is Flickering?
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Jun 27, 2012
I wish to get a quick feeling for how much copy and paste coding we have, there are many tools for C# / Java to check for this type of thing. Are there any such tools that work well with VB.NET? (I have seen what looks like lots of repeated code,
[Code]...
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Jun 21, 2010
We are trying to modify a program to control a usb relay device. Essentially what the program originally does is give you a series of check boxes that you check to make the relay fire. We tried to modify the code so that the box is checked after 5 seconds using a counter and an if statement. It works, but only partially, what happens is the check box shows a check, but the even that is normally triggered does not happen.
[Code]...
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Dec 28, 2009
I'm making an email sending program and still I don't know how to check if the mail was really sent or not, because sometimes the program will have no error messages but the mail was not actually sent. Is there any other way on how to deal with this except for making use of try catch?Here is my code:
Try
mail.From = New MailAddress(TextBox2.Text)
mail.To.Add(New MailAddress(TextBox1.Text))
[code].....
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Jan 17, 2012
I'm collecting in an array the splitted text of a textbox in order to search in a bimensional array for matching in the name, but I got the error "NullReferenceException" at the red line. Now, I looked the code multiple times, but I didn't find the error. Dim info(0 To 0, 0 To 5) 'this is array is already filled by a sub
[Code]...
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Jan 15, 2012
I have (in Excel) code similar to this:And then from there it will call the corresponding module and pass varStar to each module and run the code. The issue I have is that sometimes (like right now) it is a new year, or a new month and varStar may not exist in the specific workbook. How can I code it to, if varStar doesn't exist just skip it and keep going. I tried On Error Resume Next, and On Error GoTo 0. But that wasn't 100% efficient.
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May 24, 2011
The problem seen to appear again in printing job...I have a printer(Epson TM-T88IV Receipt)Before printing, i would like to check if printer is available for printing or not (connect or not). if not, i will show the print preview form. otherwise it will print automatically
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Nov 16, 2009
Im trying to get my code to check that my textbox has 16 digits in it so that it can then validate the number entered. Here is the doe i have so far: [code]
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May 25, 2010
i cant really find how to code check and uncheck or if listview 1. selected item = checked then.
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May 27, 2009
I'm trying to make it so that if a user checks the listview item checkbox, it does something, but not when the code checks it. This seems really basic.
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Mar 23, 2012
I don't want check if an item with a value exists in the arraylist,I want to know the best code for performance to get how many occurrences of the same item with the same value exists in an arraylist.
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Jan 7, 2009
how can I check(with code) if an mdichild form is already opened or not. I have some mdichildforms that may open together. If an mdichild form is opened I want to dislpay the already opened form and not a new one.
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Dec 16, 2010
Dim file As System.IO.FileStream Dim YesNo As Integer YesNo = MsgBox("_missions_recomp.gsc Already exists, do you want to overwrite?", vbYesNo, "Confirm Overwrite?")
[Code]...
Here's the scoop. This is a simple file check, where it will write a file so long as it does not exist,however, if the file already exists, I would like to give the user the option to overwrite the file, or not.
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Nov 15, 2011
I'm developing an application which requires log in. I'm using Master Pages and a customer Web Control which is my main menu system. The main menu accesses database information to provide notifications and various things, none of which will work unless the user is logged in. I am trying to place the following code:
If Session("hgAdminUser") = "" And InStr(Request.ServerVariables("url"), "/Login.aspx") <= 0 Then _
Response.Redirect("Login.aspx") ' if userSession is empty, redirect to login page.
Into the top of my MasterPage code behind, but it's still trying to process scripts, the main problem being that it is running the .ascs file which requires Database access, which it can't do without the required parameters from Login. I've tried running it within a Page_PreInit sub, also Page_Load and Page_Init, but in all cases it ignores this (or probably doesn't ignore it, but errors come in before it deals with this) and returns a big fat ERROR due to functions that I don't even want it to be running!! How can I check for a session variable, which if not present cause all other scripts on the page to be ignored and redirect? This is all using VB.NET
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May 27, 2010
I Was trying to make a program in vb.net, its idea like that
1) Check site titles name in every web browser that opened in the computer
2) find a specified word in the site titles
3) if the program found it , it Msgbox the site URL
I have tried this to check site titles name in every browser For Each a As Process In Process.GetProcesses
Dim x As String = a.MainWindowTitle
x = x.ToLower
If x.Contains("microsoft") Then
MsgBox("microsoft website is opened")
[code]....
but the problem in this code that if i'm opening some tabs and specified title in site is opened but i'm in another tab (another site) it does not work !
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Dec 11, 2011
I am trying to use vb.net to create apell check add in to ArcMap 10. I have finished code, but do not know why it does not works.
Here is my code:
CODE:
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Dec 20, 2009
Well on my program I made a licence that shows at the begining. So, I was wondering how do I code a check box to change the startup form?
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