Help on lex and yacc

Hi,
I have encountered two problems:
1. How to deal with error. From the yacc manual, I only have few details about
it. So, where could I find more examples dealing with error.
2. In lex file, I can set some precondition, so I can deal with #include. But,
how to change precondition of lex rules in yacc file?


Thanks!
[Yacc makes good error recovery nearly impossible. See the archives. For
the second question, put a routine in the code section at the end of the
lex file that does a BEGIN WHATEVER. You can call it from the parser as
needed. -John]

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