Hi, I have a windows 2003 server running ASP. Initially everything was fine. But recently it throws 'overflow' error when executing basic arithmetic.

The error is:
Microsoft VBScript runtime error '800a0006'
Overflow

I created a simple asp:
<%@ Language=VBScript%>
<%
option explicit

dim a,b,c,d

a = 1
b = 1
c = 1

d = a * b / c
response.write d
%>
The overflow error is at line (d = a * b / c).

And the wierd thing is that it happens randomly. sometimes it's fine, sometimes it throws 'overflow' error. When i restart IIS service, it ALWAYS working fine in the beginnig. After few hours later, 'overflow' error begins to surface. w3wp.exe is around 100mb.

But when i run the same code (in .vbs) on the server, looping for 1000 times, it doesnt give me the 'overflow' error. Also i created the same codes using vb.net, it doesnt give me the 'overflow' error.

Is this some kind of a virus? In the end I reformated the server and everything works great for few months till recently the same 'overflow' error appears.

Please2 help.

are ABC always defined as displayed above, or are they variables? Can C ever be 0?

"The one language all programmers understand is profanity."

The 0 thing was one of my thoughts.

>What are the values of a, b and c at the time of overflow?
>Are you not using cInt or cLng functions? (use then see if your error chnages to 'invalid use of cInt')

Wind is your friend
Matt

Thanks for the reply.

a,b,c is set to 1 and never change in the code. The code is as above. Unless c can suddenly change to 0...... I will output abcd then, and see what happen.

I did try using cInt and cDbl, but it also returns 'overflow' error.

Currently the servers seems to be working as i configure IIS to recycle worker processors every 10 hours, and i created 3 worker processor instead of 1.

Could it be asp engine problem? how can i diagnose/troubleshoot it? any recommendations what tools to use? Thanks

;;;a,b,c is set to 1 and never change in the code
if it never changes why calculate? you lost me a bi there.

Which brigs me to:
;;;Unless c can suddenly change to 0
mmmmmm, now Im really confused. You cant out put a result if a division by 0 is present

;;; did try using cInt and cDbl,
I hav ehad your error before. My prblem was results that were outside the range of an allowed integer using cInt, cDble fixed it.

;;;how can i diagnose/troubleshoot it?
Strip you page back till error free, test n run, test n run, test n run - until you find your problem. mmmmm, a slow long winded process. It will tell you where your problem is sometime during this process. There is a heap of info on your error on the net, several causes, have you googled it?

BTW is is a stack overflow error or just an overfloe error? IME these are un common and are like a needle in the haystack. Sorry couldnt be much help...

Wind is your friend
Matt

Sorry for the confusion. The real codes is not like the above. The above is the simple test code to show that even 1*1/1 simple calculation can create strange 'overflow' error in 2 of my server 2003. The real code is to resize the image based on the inputed height or width.

Initially i thought it's because of cInt or cDble, so i convert everything (using cInt and cDble) in the codes, but it still gives me the 'overflow' error. After debugging the codes, i found out that it's definately not because of division of 0 or outside the range of datatype. Because with the same value of abc, sometimes got 'overflow' and sometimes are fine. So, I created the simple arithmetic page (which is 1*1/1), and it gives me 'overflow' error!???

The error:
Microsoft VBScript runtime error '800a0006'
Overflow

then the line that causes the error (which is on the 1*1/1)



Thanks.

the servers now is going wild!!! keep on giving overflow error. funny thing is that the 'overflow' error occured when im doing a division. but it's not division by 0.

my test page is as follow:
<%
on error resume next
dim a,b,c,d

a = 1
b = 1
c = 1
d = cdbl(cdbl(cdbl(a) * cdbl(b)) / cdbl(c))
response.write a & " * " & b & " / " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear

a = 1
b = 1
c = 1
d = a + b + c
response.write a & " + " & b & " + " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear

a = 1
b = 1
c = 1
d = a * b + c
response.write a & " * " & b & " + " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear

a = 1
b = 1
c = 1
d = a + b / c
response.write a & " + " & b & " / " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear

a = 1
b = 1
c = 1
d = a * b / c
response.write a & " * " & b & " / " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear

a = 1
b = 1
c = 1
d = a / b * c
response.write a & " / " & b & " * " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear

a = 1
b = 1
c = 1
d = a + b - c
response.write a & " + " & b & " - " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear

a = 80
b = 144
c = 177
d = a * b / c
response.write a & " * " & b & " / " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear

a = 80
b = 144
c = 177
d = a + b / c
response.write a & " + " & b & " / " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear

a = 80
b = 144
c = 177
d = a + b * c
response.write a & " + " & b & " * " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear

a = 80
b = 144
c = 177
d = a + b + c
response.write a & " + " & b & " + " & c
response.write " = " & d
response.write err.description & "<br>"
err.clear
%>

The 'overflow' occurs on ALL the lines that has the division. Please note that this happens quite randomly.

Wish I could help. I have seen this only once, your issue isnt jumping out at me. I guess stripping it back doesnt tell you much if its only a random problem

Wind is your friend
Matt

This line here:

a = 80
b = 144
c = 177
d = a + b / c

What value are you expecting? Because I get 80.813559322033898305084745762712

"The one language all programmers understand is profanity."

thanks mat for bothering into looking at this.
dparsons, you are right,
a = 80
b = 144
c = 177
d = a + b / c
should return 80.813559322033898305084745762712

However, on my 2 servers, sometimes it returns the correct answer, and sometimes gives me 'overflow' error. The 'overflow' error occurs randomly. My point is no matter what value i put, the division arithmetic will gives me random 'overflow' error, even 1+1/1!!!!