Flex/Bison problems

[Gugia]

Good evening!! Apparently i am having problems with this languages and it is very hard to find answers on the web about it.
I am trying to run a program from Oreily Flex and Bison

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/* simplest version of calculator */ %{ #include <stdio.h> %} /* declare tokens */ %token NUMBER %token ADD SUB MUL DIV ABS %token EOL %% calclist: | calclist exp EOL { printf("= %d\n", $1); } ; exp: factor default $$ = $1

| exp ADD factor { $$ = $1 + $3; } | exp SUB factor { $$ = $1 - $3; } ; factor: term default $$ = $1<----I deleted "default $$ = $1" | factor MUL term { $$ = $1 * $3; } | factor DIV term { $$ = $1 / $3; } ; term: NUMBER default $$ = $1<----I deleted "default $$ = $1" | ABS term { $$ = $2 >= 0? $2 : - $2; } ; %% main(int argc, char **argv) { yyparse(); } yyerror(char *s) { fprintf(stderr, "error: %s\n", s); }

I am making a .y file in visual studio 2008 and i get the followin error

error LNK2019: unresolved external symbol _grammar1lex referenced in function _grammar1parse

Any ideas?

[Bourgond Aries]

I only found a book from Oreilly media "Flex and Bison" about text processing.

THe code your posted has little C++ to it, in fact nothing of it afaik, only a little C on line 11 in printf and 3 #include <stdio.h>.

I think you're on the wrong language board.