ISBN-10 Check Digit Calculating
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.
View 8 Replies
ADVERTISEMENT
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]...
View 4 Replies
Feb 11, 2010
I can get it to tell me if the ISBN I entered is valid or not, but there is a second part I need that I keep drawing blanks on. I need to be able to enter an ISBN with a missing digit marked by a "?" in the textbox i am entering the ISBN in. For those who don't know what an ISBN is it...
An ISBN (International Standard Book Number) is a ten digit code which uniquely identifies a book. The first nine digits represent the book and the last digit is used to make sure the ISBN is correct. To verify an ISBN you calculate 10 times the first digit, plus 9 times the second digit, plus 8 times the third ... all the way until you add 1 times the last digit. If the final number leaves no remainder when divided by 11 the code is a valid ISBN.
1.Write a program that reads a ten digit number and validates it.(DONE)
2.Write a program that reads in a valid ISBN with a single missing digit, marked with a ?, and outputs the correct value for the missing digit.(Ehhh....)[code]So i need help making it so i can input a ISBN with a missing digit marked by "?" and output a valid ISBN with missing digit.
View 2 Replies
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]....
View 2 Replies
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]....
View 12 Replies
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?
View 32 Replies
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]...
View 1 Replies
Apr 22, 2012
Ok, I have like this:
Public basic_numbers(10) As Integer
basic_numbers(0) = 0
basic_numbers(1) = 1
[code].....
View 9 Replies
Aug 30, 2009
For example 0-619-15934-0 becomes 0619159340. I'm sorry if this is an easy question but I'm a noob when it comes to visual basic.
Here's my failed code.
Code:
Dim check, i As String
i = txtISBN.Text
If txtISBN.text = - Then
""
End If
View 1 Replies
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.
View 1 Replies
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]....
View 1 Replies
Oct 16, 2009
I need to add a loop to allow repeated checking of ISBN numbers, which should check to determine when processing should be ended and should allow exiting the program without having to enter an ISBN before quitting. I also need to use a Select Case for the three ISBN possibilities (ISBN-10, ISBN-13, invalid ISBN length).
[Code]....
View 10 Replies
Jul 2, 2010
how can i set a data grid view control in visual basic .NET to allow the first digit in a numeric cell to be 0?
View 1 Replies
May 30, 2009
I am trying to generate all possible 3 or 4 digit combinations from 0 to 9. I will be outputting them to a text file but I just need help with actually generating them.
View 7 Replies
Jul 18, 2009
i need a 2 digit prefix that increments. 1 - 99.. after reaching 99 it will be 100, that what im supposed to trap. if must be a0 - a9, after then b0-b9 ...... z0-z9.
View 3 Replies
Feb 6, 2012
How I could retrieve the single digits of a 4 digit number to manipulate them in my own way to encrypt the 4 digit number to my liking. Here's what I have to do; take a 4 digit number, add 7 to each digittaking the result and dividing by 10 leaving only the remainder. Then swap the first digit with the third, and swap the second with the fourth digit.
View 9 Replies
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.
View 2 Replies
Feb 17, 2011
I'd like to know how to get VB to display the individual digits of a three digit number when I click a button. Sorry if this seems simple, or if it's in the wrong place.
View 8 Replies
Nov 11, 2009
How can I get the datetimepicker value to have a 2 digit day EX. If it was November 6, 2009 the value is showing as 11/6/2009 but I need it to be 11/06/2009
I have a search that searches by date and Im using the datetimepicker. the date format in from my sql database is in MM/DD/YYYY not MM/D/YYYY So my results come up ok if the day is a 2 digit day normally (ex. 11/20/2009)but if its a single date (11/6/2009) I don't get any results because it is looking for 11/06/2009 I don't see how I can get the value of datetimepicker to be MM/DD/YYYY Even if i set the custom format to MM/dd/yyyy the value is showing up as MM/d/yyyy
View 5 Replies
Nov 7, 2010
I'm populating a checkedlistbox with this loop.
Dim week As Integer
For week = 1 To 51 Step 2
CheckedListBox1.Items.Add(week)
Next
And get this result 1 3 5 7 9 11 13 etc.
This is how I want it 01 03 05 07 09 11 13 etc.
View 1 Replies
May 14, 2009
how do i code this in vb.net: focus the textbox and get the cursor to the rightmost digit?
View 1 Replies
Sep 18, 2009
validation for , allow only 2 digit after decimal point in TextBox in vb.net eg 150.25
View 3 Replies
Feb 14, 2012
Im wondering if how to convert 02/14/2012 to this format '20120214'
I want do save date in my database in that format...because I see it more flexible
View 6 Replies
Jan 5, 2011
I need to round like this:
12 -> 10
152 -> 200
1538 -> 2000
25000 -> 30000
etc.
Twisting my head, but can't see how to make this. Must work for any n number of digits. Anyone got an elegant method for it?
View 6 Replies
Nov 1, 2009
I have to do one project like : 1.Complete the code to convert a 3 digit number to Text (Number > 19) 2.Adding suitable conditional statements modify to code to support the whole range of 3 digit numbers.
View 3 Replies
Oct 14, 2009
I am searching an MS Access database via an asp written in VBscript. I am looking for entries that are less than 45 days old. The query worked great until October rolled around. Then none of the new entries were being displayed. I discovered that any month that has 2 digits, such as October with 10 or even Jan-Sept if I enter a "0" in the month (ie. 09 vs just 9), will not display. The SQL statement is below (created in Dream Weaver):
<%Dim rs_blog__MMColParamrs_blog__MMColParam = "entrydate"%>
<%Dim MinDateMinDate = DateAdd("d",-45,Date())%><%Dim rs_blogDim rs_blog_numRows
Set rs_blog = Server.CreateObject("ADODB.Recordset")rs_blog.ActiveConnection = MM_intranet_STRINGrs_blog.Source = "SELECT id, employee, subject, blog, entrydate FROM blog WHERE entrydate >= '" + Replace(MinDate, "'", "''") + "' ORDER BY id DESC"
How do I get the data that has 2 digits in the month to display and only show the entries that are no more than 45 days old.
View 3 Replies
Apr 3, 2010
I'm trying to go enter data in textbox1, with the click of button1 any digits will be raised to their special key function!
View 1 Replies
Jun 1, 2012
In the function it returns the no in one digit .I want it to always return 2 digit number.Like if it is 0, it should return 00.
Public Function GetHexColor(colorObj As System.Drawing.Color) As String
Return Hex(colorObj.R) & Hex(colorObj.G) & Hex(colorObj.B)
End Function
View 1 Replies
Aug 15, 2009
I have a function which takes in an integer value. I want to be able to grab the first digit (or the first and second digits in some cases) of this integer and do something with it.What is the best way in VB.NET to get the first digit of an integer (or the first and second)?
View 6 Replies
Feb 10, 2009
I would like to know how to detect a two digit number within a string.
For example: how can I pull the number 42 from that string?
View 3 Replies
