[huskerlug] Re: More of a GCC problem.
- From: Ben Chavet <ben@xxxxxxxxxx>
- To: huskerlug@xxxxxxxxxxxxx
- Date: Tue, 18 Mar 2003 09:14:10 +0600
Is there a reason you want to use a variable array? If not, use a #define to
create a constant & use that in your array declaration. Or you could just use a
literal.
I think the link you gave said it all:
(However, GCC's implementation of variable-length arrays does not yet
conform in detail to the ISO C99 standard.)
There is always more than one way to do something. Especially in a language as
complex as C/C++.
--Ben Chavet
Quoting Jon Richardson <jonpaulrichardson@xxxxxxxxxxx>:
>
>
>
> Grr.... I'm fed up of buggy compilers, maybe it's just me? :) Anyways I'm
> fairly new to gcc having ported my code from visual c++ 6. (Although this
> code wasn't ported from visual c++ 6) I'm getting some strange results from
>
> the output of my code.
>
> The variable iLabelNode is a variable sized array declared as such:
>
> int iBalance = 0;
> int iLabelNode[iBalance];
>
> The variable iBalance later changes to a larger value.
>
> Here is the code where the problem occurs:
>
> puts("<------------- FlowGraph Crap -------------->");
> for (UINT m = 1; m <= oListLabel.Count(); ++m)
> {
> printf("%s = %d\n", oListLabel.Value(m), iLabelNode[m -
> 1]);
> }
>
> printf("iLabelNode[0] = %d\n", iLabelNode[0]);
>
> //get actual count
> m_iNodeCount -= iBalance;
>
> printf("iLabelNode[0] = %d\n", iLabelNode[0]);
>
> //create nodes
> Node* pNode = 0;
> for (int y = 0; y < m_iNodeCount; ++y)
> {
> pNode = new Node;
> pNodeArray[y] = pNode;
> }
> printf("iLabelNode[0] = %d\n", iLabelNode[0]); //<-- screw up here
>
>
> Can also be viewed here for pretty syntax highlighting :)
> http://www.rafb.net/paste/results/P1014321.html
>
> PORTION OF OUTPUT
> <------------- FlowGraph Crap -------------->
> IL_0006: = 4
> IL_000e: = 6
> iLabelNode[0] = 4
> iLabelNode[0] = 4
> iLabelNode[0] = 134587360
>
> My question is why does the value of iLabelNode[0] change when it's clearly
>
> not being modified? The funny thing is is that if I declare it as such "int
>
> iLableNode[100]" it works fine. Should I just avoid variable sized arrays?
>
> Am I doing something stupid I don't see?
>
> Here is what the gcc manual says about variable sized arrays, didn't say
> much but maybe I'm missing something.
> http://gcc.gnu.org/onlinedocs/gcc-3.2.2/gcc/Variable-Length.html#Variable%20Length
>
> If anyone could shed some light on this for me I would be very thankful,
> this is driving me nuts.
>
> Thanks,
>
> Jon
>
>
>
>
>
> _________________________________________________________________
> Help STOP SPAM with the new MSN 8 and get 2 months FREE*
> http://join.msn.com/?page=features/junkmail
>
>
> ----
> Husker Linux Users Group mailing list
> To unsubscribe, send a message to huskerlug-request@xxxxxxxxxxxxx
> with a subject of UNSUBSCRIBE
>
>
----
Husker Linux Users Group mailing list
To unsubscribe, send a message to huskerlug-request@xxxxxxxxxxxxx
with a subject of UNSUBSCRIBE
Other related posts:
