Thanks Thomas!
And thanks for all the help I got!
The problem is solved at this point.

Regards,
Angela
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Dept. of CS, Rice Unitersity
http://www.cs.rice.edu/~yz2/
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On Oct 31, 2007, at 10:16 AM, Thomas Gazagnaire wrote:

> Well, I think you have a problem in your grammar rules. Your are  
> defining the same PLUS, MINUS, STAR and DIVIDE rules in multiple  
> places in your code. Try to define them once, only in the "exp"  
> rule. Them, remove in the "exp" rule :