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 :