Re: C syntax, and spurious semicolons

On Tue, 22 Feb 2011, Dominique Pellé wrote:

> On Hugh Sasse wrote:
>
> > I've been assisting a colleague with their C code, and he has
> > learned to add semicolons at the end of statements too well.  His
> > current favourite mistake is to write
> >  if (expression == value);
> >  {
> >    do_something();
> >  };
> > I frequently miss the trailing semicolon on the first line.   So I
[...]
>
>
> Without using Vim, gcc can give a warning for such dubious code:
>
> $ cat foo.cpp | nl
> 1 int main(int argc, char **argv)
> 2 {
> 3 int a;
> 4 if (argc == 1);
> 5 {
> 6 a = 1;
> 7 }
> 8 a = 0;
> 9 return a;
> 10 }
>
> $ g++ -Wall -Wempty-body foo.cpp
> foo.cpp: In function ?int main(int, char**)?:
> foo.cpp:4: warning: suggest braces around empty body in an ?if? statement

Thanks. I'd probably stare at that and think "But the body isn't empty,
it's got 'a=1;' in it!" :-) But I'd not noticed the -Wempty-body.
>
> -- Dominique
>
Thank you,
Hugh

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