Re: %left is not working

[Hans Aberg]

On 3 Aug 2010, at 18:54, Sasan Forghani wrote:

> | ( expr)
>
> as long as there isn't ( expr ) in the input input move up without  
> problem.
> However once input does have an ( expr) part, $<blIdentifier>1 at  
> the ADDOP
> level has the value of $<blIdentifier>1 at the ASSIGNMENT level.   
> When I add
> the following action to the ( expr ) production-  
> {strcpy($<blIdentifier>1,
> $<blIdentifier>2);}, $<blIdentifier>1 at the ADDOP level has the  
> correct
> value but then the $<blIdentifier>1 at the ASSIGNMENT level value is  
> what I
> changed $<blIdentifier>1 to be at the ( expr ) level.  I'm very  
> confused.

If you do not write out an action, { $$ = $1; } will be added  
implicitly. SO if you have something special that must be done, it  
must be written out explicitly.