Re: Overflow error in Progress Bar
- From: "Rick Rothstein" <rick.newsNO.SPAM@xxxxxxxxxxxxxxxxxx>
- Date: Mon, 13 Apr 2009 16:24:41 -0400
If **all** the numbers you are calculating with are Integers (that is a VB Integer... a number between -32566 and +32567)
Okay, and the correct range for VB Integers is -32768 to 32767.
--
Rick (MVP - Excel)
"Rick Rothstein" <rick.newsNO.SPAM@xxxxxxxxxxxxxxxxxx> wrote in message news:%23a$ShMHvJHA.1208@xxxxxxxxxxxxxxxxxxxxxxx
VB is strange this way. If **all** the numbers you are calculating with are Integers (that is, a VB Integer... a number between -32566 and +32567), then VB will try to put the answer into an Integer... if any part of the calculation (not the final answer, but the sub-calculations that go into making the final calculation) exceeds what an Integer can hold, then an overflow error is generated. Multiplication and Division have the same order of precedence and, in that case, calculations take place from left to right for the operations with equal precedence. So, in your sub, the 300 gets multiplied by the (111 - 1), which is 110, before the division by 200 takes place... 300 * 110 equals 33000 which is larger than an Integer can hold, hence, an overflow is generated before the division has a chance to reduce the calculation to a number that will fit in an Integer. Now, if any one number is made into a numeric data type other than an Integer (this applies to hard coded numbers as well as Dim'med variables), then the problem is avoided (because **all** the numbers are not Integers). You can use the CLng function to force VB to consider a number that would have been an Integer to be a Long instead. Try your statement this way...
MsgBox CLng(300) * (111 - 1) / 200
--
Rick (MVP - Excel)
"René" <Ren@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:F0A0C23C-E4A3-495D-B736-952B199383BB@xxxxxxxxxxxxxxxxThe solution to declare the variables as "Long" works fine.
But
I've tried 2 new and very basic tests and I still get the error.
Test #1
Sub CheckOverflow2()
MsgBox 300 * (111 - 1) / 200
End Sub
Test#2
Sub BasicTest()
MsgBox CheckOverflow3()
End Sub
Function CheckOverflow3() As Long
CheckOverflow2 = 300 * (111 - 1) / 200
End Function
"Nigel" wrote:
Try using
Dim i As Long
The overflow occurs when computing the new cell value beyond the limit of
the integer range for i.
--
Regards,
Nigel
nigelnospam@xxxxxxxxx
"René" <Ren@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:8D669899-58E5-4EFB-AA31-2177BB955538@xxxxxxxxxxxxxxxx
>I got an "Overflow" error in one of my Progress Bar. When debugging >the
> code, I found out that I am able to reproduce the problem any time. > The
> bar
> width is 300 points and I want to show progress 200 times. The sample
> code
> below reproduce the problem all the time. Can someone tell me what is
> wrong?
>
> By the way, I am using Ms-Office Excel 2003 SP3.
>
>
> Sub CheckOverflow()
> Dim i As Integer
> Dim r As Integer
> r = 200
> On Error Resume Next
> For i = 1 To r
> Err.Clear
> Cells(i, 1) = 300 * (i - 1) / r
> If Err Then Cells(i, 1) = Error(Err)
> 'Call MyMacro()
> Next i
> End Sub
>
.
- Follow-Ups:
- Re: Overflow error in Progress Bar
- From: René
- Re: Overflow error in Progress Bar
- References:
- Overflow error in Progress Bar
- From: René
- Re: Overflow error in Progress Bar
- From: Nigel
- Re: Overflow error in Progress Bar
- From: René
- Re: Overflow error in Progress Bar
- From: Rick Rothstein
- Overflow error in Progress Bar
- Prev by Date: Re: Can't name new workbook
- Next by Date: RE: Customise Ribbon Excel 2007
- Previous by thread: Re: Overflow error in Progress Bar
- Next by thread: Re: Overflow error in Progress Bar
- Index(es):
Relevant Pages
|
