ExamGuru IT/.Net Guru : System.DivideByZeroException does not catch exception on microsoft.public.dotnet.languages.vb

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System.DivideByZeroException does not catch exception

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This message was discovered on microsoft.public.dotnet.languages.vb.

Amin Sobati

Hi,
I have the following code in my app:

Dim intx As Integer
Dim inty As Integer
Dim intz As Integer
inty = 0
intx = 5
Try
intz = intx / inty
Catch ex As System.DivideByZeroException
MsgBox("Catch")
End Try

But System.DivideByZeroException does not catch the exception. If I use
System.OverflowException it will work.
What's the reason?
Thanks,
Amin

Reply to this message...

Dot Net Guruias Sjögren

[Original message clipped]

The reason is that the / operator performs floating point division,
which doesn't throw a DivideByZeroException but rather returns NaN or
Infinity. If you turn on Option Strict this whould be more visible
since converting the result back to an Integer is a narrowing
conversion.

The solution may be to use the integer division operator \ instead.

Dot Net Guruias

--
Dot Net Guruias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

Reply to this message...

Amin Sobati

Thanks Dot Net Guruias!
It was great tip :-)
Amin

"Dot Net Guruias Sjögren" <Click here to reveal e-mail address> wrote in message
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Reply to this message...

	System.DivideByZeroException
	System.OverflowException

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