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From: stefan-lucks@see-the.signature
Newsgroups: comp.lang.ada
Subject: Re: YACT (Yet Another C Trap)
Date: Mon, 30 Aug 2010 10:21:40 +0200
Organization: Bauhaus-Universitaet Weimar
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Date: 2010-08-30T10:21:40+02:00
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On Sun, 29 Aug 2010, Maciej Sobczak wrote:

> > int x = 10,000; // oops, it will compile, perhaps even without
> > warnings. Happy debugging!
> 
> Did you actually tried or are just repeating unchecked nonsense?
> The above example is explicitly handled (forbidden) by both C and C++
> standards - comma has special meaning in declarators.

I tried it out. The above example gives an error. But the following 
program compiles without warnings with gcc:

#include <stdio.h>
int main (int argc, char **argv)
{ float x;

    x = 12,3;

    if (x > 12.1) printf("greater"); else printf("smaller or equal");
  printf(" than 12.1.\n");
}

Here is what it does:

> gcc flaw.c    
> ./a.out
smaller or equal than 12.1.

Is this a language flaw of C, or a bug in gcc?


-- 
------ Stefan Lucks   --  Bauhaus-University Weimar  --   Germany  ------
               Stefan dot Lucks at uni minus weimar dot de
------  I  love  the  taste  of  Cryptanalysis  in  the  morning!  ------