left or right association for unary operators???

"Antonio López Torres" <news@ono.com>
29 May 2003 03:28:53 -0400

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Related articles
left or right association for unary operators??? news@ono.com (Antonio López Torres) (2003-05-29)
Re: left or right association for unary operators??? haberg@matematik.su.se (2003-06-03)
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From: "Antonio López Torres" <news@ono.com>
Newsgroups: comp.compilers
Date: 29 May 2003 03:28:53 -0400
Organization: Compilers Central
Keywords: parse, question, comment
Posted-Date: 29 May 2003 03:28:53 EDT

I would like to know if there is any diference between declaring
NOT token as %left or %right in the next grammar and why if i
declare as %token exists 2 shift/reduce conflicts.


expr
      : expr
      | expr AND expr
      | expr OR expr
      | NOT expr
      | (expr)
      ;


Thank you.
[Without the precedence, expressions are ambiguous:


    NOT A AND B is it (NOT A) AND B or NOT (A AND B) ?


-John]


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