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Re: GCC-ANSI C conflict


On Jun 16, 2005, at 12:35 AM, Sankara Rameswaran wrote:

hi
according to ansi c standards all declarations have to to be at the
starting of the block..
which means the program below should not work.. i compiled this using gcc

For C90 yes but not for C99.

gcc (GCC) 3.4.3 20041212 (Red Hat 3.4.3-9.EL4)
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 

but it is working fine..
this might be fine with g++ but i used gcc...

int main()
{
  int i;
  scanf("%d",&i);
  int a[i];
  a[i-1]=128;
  printf("%d",a[i-1]);
}

is this a bug or just for compatability with c++...

Not this is for C99 compatibility. In fact you are using VLAs which are part of C99
and not part of C++ at all.

Thanks,
Andrew Pinski

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