Re: Re: help please?

On Mon, May 03, 2004 at 04:54:34PM +1200, Greg Ewing wrote:
> Alternatively, don't use precedence rules at all, and write
> out a hierarchy of productions to express precedences.
> 
> Explicit is better than implicit. :-)

I agree to a certain degree, but for someone without much
cc experience it's easier to read and write:

----------
%left '+'
%left '*'

exp:  num
     | exp '+' exp
     | exp '*' exp
----------

then:

----------
exp: exp '+' term
    | term
term: term '*' num
    | num
----------

Even though the second gives a much clear indication of what
it's going to do.

Factoring out most of the precedence should definitely be done
at some point though.

Kenny