![]() ![]() ![]() In that example, the YACC program contains the declaration for the token DIGIT in the declarations section. In the infix to postfix conversion example in the YACC documentation, we had used a user defined yylex() in the YACC program. Recall that yyparse() attempts to parse the given input by calling yylex() to obtain tokens. NOTE: We must not provide a main() definition in the LEX program calling yylex(), as there already exists a main() function in the YACC program which calls yyparse() which in turn calls yylex(). We should now compile it as gcc y.tab.c lex.yy.c -o the previous documents, we have noted that YACC is used to generate a parser ( YACC documentation) and LEX is used to generate a lexical analayzer ( LEX documentation). ![]() USING LEX WITH YACC Integrating LEX with YACC ![]() Passing tokens from the Lexer to the Parser. ![]()
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