Visual Basic

8-Aug-06 1:18

Hi,

In my vb.net editor, when I type a double number like 6.35, it automatically is converted to 6.3499999999999996 when I leave the line I am typing.

Can anyone tell me why it happens and how to avoid it? Confused | :confused:

Thanks in advance,

Vinicius

Dave Kreskowiak8-Aug-06 1:32

8-Aug-06 1:32

This is because of how numbers are stored internally by the system. There's no way to avoid it. Although, I'm not seeing the problem you're describing using Single or Double types. Can we see the code this is happening in?

Dave Kreskowiak
Microsoft MVP - Visual Basic

Vinicius Pontes8-Aug-06 3:35

8-Aug-06 3:35

The code is simple:

<br />
Dim myVar as double<br />
myVar = 6.35<br />

after typing 6.35, the editor changes it to

<br />
Dim myVar as double<br />
myVar = 6.3499999999999996<br />

I understand it can be stored like that internally. What I don't understand is why in some projects it doesn't happen.

Another problem I see is that if I try to use the "Text Find" resource in my project, to find a string like 6.35 I will never locate it, so why couldn't the editor leave my numbers exactlly as they are typed?

The program I'm writing is working perfect, although these editor's changes, but it doesn't make me happy. Sigh | :sigh:

Vinicius

Vinicius Pontes8-Aug-06 6:43

8-Aug-06 6:43

I found out that if the number has only one dacimal value, nothing changes:

<br />
Dim myVar as double<br />
myVar = 6.3<br />

So, again, why?
Confused | :confused:

Guerven8-Aug-06 15:49

Guerven

8-Aug-06 15:49

do you save the values as strings Confused | :confused:

?
just a Q.

U Xux

Vinicius Pontes9-Aug-06 3:55

9-Aug-06 3:55

No, they are all double

Dave Kreskowiak8-Aug-06 16:19

8-Aug-06 16:19

I coudln't tell you what's causing it or how to "fix" it because I've never run into the problem. There's no mention of it in the MS Knowledge Base, that I could find anyway.

Have you installed SP1[^] for .NET 1.1?

Dave Kreskowiak
Microsoft MVP - Visual Basic

Vinicius Pontes9-Aug-06 3:56

9-Aug-06 3:56

I'll try SP1

Thanks

Vinicius Pontes9-Aug-06 4:20

Re: Bank & Access problem

9-Aug-06 4:20

I was already using SP1.

Bank & Access problem

stoneman88-Aug-06 1:11

stoneman8

8-Aug-06 1:11

Problem

Keep data about customers, accounts and managers on a access database

Customers are identified by a unique 8 character identifier

Table Customers

customerID char(8) (key field)
customerSurname varchar
customerForeNames varchar

customers can have lots of accounts. Accounts are identified by a automatically generated integer. Each account has a pin of exactly 4 digits. There is also a field called blocked whose value determines weather or not a customer can perform transaction on that account. A value of 1 means that the account is blocked.

Table Accounts

accountID int (key field)
customerID char(8)
balance money
blocked bit (default value 0 for false)
PIN char(4)

Information on bank workers stored in another table

Table managers

managerID char(8)
password char(10)

program should allow managers to log in by entering managerID and matching password. If login successful new screen that allows him/her to add new customers, accounts for existing customers and block accounts.

Form that simulates a cash dispenser. A customer should be able to enter accountID and associated PIN via a numeric keypad. Program must check to see if the account is valid and the accounted and PIN match. If allowed the customer should be presented with a form that allows him/her to check their balance, make a withdrawal or change PIN. If accountID is invalid customer should be informed of a error message. If the accountID is valid and the PIN does not match the customer get another 2 attempts but if the PIN is incorrect after the 3 attempts the account is blocked.

any advice, help or code would be really apreciated

cheers

Dave Kreskowiak8-Aug-06 1:34

Re: Splash Screen [modified]

8-Aug-06 1:34

First off, this is a homework assignment. Your supposed to be doing the work yourself and as such, noone here will write the code for you.

Next, what are you having a problem with? We need a specific problem your having...

Dave Kreskowiak
Microsoft MVP - Visual Basic

Splash Screen

Govind Bhanushali8-Aug-06 0:17

Govind Bhanushali

8-Aug-06 0:17

I want to display splash screen in vb.net
i used timer on form when its tick method invoked i written
dim f2 as new form
f2.show()
me.close

but it is closing complete application

i tryed more then 5 diff. ways for that but its not working
pls give me simple logic

Yogesh

The ANZAC8-Aug-06 0:34

The ANZAC

8-Aug-06 0:34

Go to the Projects properties, in application settings you will find an option as to whether you want the program close when first form closes or last form closes, set that to when last form closes.

In code:
Dim F2 as new system.windows.forms
F2.Size.X = 200 ' or whatever you want
F2.Size.Y = 200 ' or whatever you want
' other form properties

controls.add(F2)

me.close

It is important to add the form to the controls so that the framework can register it and work with it.

-- modified at 6:34 Tuesday 8th August, 2006

Posted by The ANZAC

Re: Splash Screen

Govind Bhanushali8-Aug-06 1:22

Govind Bhanushali

8-Aug-06 1:22

no you didn't understand my problem.
its not working.
even there is no option in project property that you are saying.
i want splash screen which one display for 5 seconds at the start up of the project and then close and open the login form after closing itself.

Re: Splash Screen

Dave Kreskowiak8-Aug-06 1:36

8-Aug-06 1:36

All you have to do is search the Articles for "splash screen" and you'll find plenty of examples. See the "Search bar" just below the green menu bar?? That's where you'll find your answer.

Dave Kreskowiak
Microsoft MVP - Visual Basic

pictureBox Control

Govind Bhanushali8-Aug-06 0:12

Govind Bhanushali

8-Aug-06 0:12

I want to Set Image of picture box that i selected from Open Dialog box
i written code but its not working

Dim dialogresult As DialogResult
dialogresult = dlgOpen.ShowDialog()
If dialogresult = dialogresult.Cancel Then
MsgBox("Select ImageFile which you want to make Transparent background")
Else
pb1.Image.FromFile(dlgOpen.FileName)

MsgBox(dlgOpen.FileName)

here msgbox showing full path with selected image file
then also its not working
pls help

Yogesh

Re: pictureBox Control

Dave Kreskowiak8-Aug-06 1:43

How to unlock the Session in POP3 server

8-Aug-06 1:43

What do you mean by "not working"? Do you get any exceptions? I have a suspicion that your not loading the picture correctly. You might want to try this:

Dim newImage As New Bitmap(dlgopen.FileName)
pb1.Image = newImage

Dave Kreskowiak
Microsoft MVP - Visual Basic

Exelioindia8-Aug-06 0:07

Exelioindia

8-Aug-06 0:07

Hi,

Any one suggest me how to unlock the locked session in POP3 server due to improper shut down.
I am trying to access the mail from the mail server using vb.net, while runing the programe due to some error my application closed with out the closing the session. Due to this i cant able to login in my account. How to clear the session.

Cheers
Exelio

Re: How to unlock the Session in POP3 server

Dave Kreskowiak8-Aug-06 1:45