Help with Yacc++ ?
Tue, 11 Feb 1992 02:04:22 GMT

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Newsgroups: comp.compilers
Keywords: yacc, question
Organization: Computer Science Dept. University of Auckland
Date: Tue, 11 Feb 1992 02:04:22 GMT

I am having trouble with yacc++, an object oriented version of yacc put
out by a company called Compiler Resources. Does anyone out there use it?
Here is my problem:

I have a grammar
S: E ;
E: Id | -E | E-E | E E ;

This grammar is not accepted by yacc++. It says that with a lookahead of
"-" there are two productions which both reduce to E from a state.
However, when I put it through yacc it only gives shift/reduce errors.
Ha??? How can this be? I don't understand. Can someone please tell me why
yacc [LALR(1)] accepts this but yacc++ [LR(1)] doesn't.

Please reply by e-mail to me at

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