The additional C code section is copied verbatim to the end of
the parser file, just as the C declarations section is copied to
the beginning. This is the most convenient place to put anything
that you want to have in the parser file but which need not come before
the definition of yyparse. For example, the definitions of
yylex and yyerror often go here. See section Parser C-Language Interface.
If the last section is empty, you may omit the `%%' that separates it from the grammar rules.
The Bison parser itself contains many static variables whose names start with `yy' and many macros whose names start with `YY'. It is a good idea to avoid using any such names (except those documented in this manual) in the additional C code section of the grammar file.
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