Re: Hi everyone,

I've managed to come a bit more forward, now my lexer.l files look like 
this:

%{
#include <stdio.h>
#include <stdlib.h>
#include "./parser.tab.h"
enum yytokentype {
     NUMBER = 285,
     VAL = 292,
     ADD = 286,
     SUB = 287,
     MUL = 288,
     DIV = 289,
     ABS = 290,
     EOL    = 291
};
int yylval;
%}

%%

"+"            { return ADD; }
"-"            { return SUB; }
"*"            { return MUL; }
"/"            { return DIV; }
"|"            { return ABS; }
[0-9]+        { yylval = atoi(yytext); return NUMBER; }
\n            { return EOL; }
[ \t]        { /* ignore whitespaces */ }
.            { printf("Unknow char :%c", *yytext); }

%%


parser.y:

%{
#include <stdio.h>
#include <stdlib.h>
%}


%token NUMBER
%token ADD SUB MUL DIV ABS
%token EOL

%%

calclist: /* nothing */
     | calclist exp EOL { printf(" = %d\n", $2); }
     ;

exp: factor
     | exp ADD factor { $$ = $1 + $3; }
     | exp SUB factor { $$ = $1 - $3; }
     ;

factor: term
     | factor MUL term { $$ = $1 * $3; }
     | factor DIV term { $$ = $1 / $3; }
     ;

term: NUMBER
     | ABS term { $$ = $2 >=0? $2 : - $2; }
     ;

%%
int main(int argc, char **argv){
     yyparse();
     return(0);
}

int yyerror(char *s){
     fprintf(stderr, "error: %s\n", s);
     return(0);
}

I can compile with flex -l lexer.l; bison -d parser.y; gcc -o parser 
parser.tab.c lex.yy.c -lfl but i get the following error messages:


parser.tab.c: In function ‘yyparse’:
parser.tab.c:1124:16: warning: implicit declaration of function ‘yylex’ 
[-Wimplicit-function-declaration]
        yychar = yylex ();
                 ^~~~~
parser.tab.c:1289:7: warning: implicit declaration of function ‘yyerror’ 
[-Wimplicit-function-declaration]
        yyerror (YY_("syntax error"));
        ^~~~~~~
lexer.l:5:6: error: nested redefinition of ‘enum yytokentype’
  enum yytokentype {
       ^~~~~~~~~~~
lexer.l:5:6: error: redeclaration of ‘enum yytokentype’
In file included from lexer.l:4:0:
./parser.tab.h:46:8: note: originally defined here
    enum yytokentype
         ^~~~~~~~~~~
lexer.l:6:2: error: redeclaration of enumerator ‘NUMBER’
   NUMBER = 285,
   ^~~~~~
In file included from lexer.l:4:0:
./parser.tab.h:48:5: note: previous definition of ‘NUMBER’ was here
      NUMBER = 258,
      ^~~~~~
lexer.l:8:2: error: redeclaration of enumerator ‘ADD’
   ADD = 286,
   ^~~
In file included from lexer.l:4:0:
./parser.tab.h:49:5: note: previous definition of ‘ADD’ was here
      ADD = 259,
      ^~~
lexer.l:9:2: error: redeclaration of enumerator ‘SUB’
   SUB = 287,
   ^~~
In file included from lexer.l:4:0:
./parser.tab.h:50:5: note: previous definition of ‘SUB’ was here
      SUB = 260,
      ^~~
lexer.l:10:2: error: redeclaration of enumerator ‘MUL’
   MUL = 288,
   ^~~
In file included from lexer.l:4:0:
./parser.tab.h:51:5: note: previous definition of ‘MUL’ was here
      MUL = 261,
      ^~~
lexer.l:11:2: error: redeclaration of enumerator ‘DIV’
   DIV = 289,
   ^~~
In file included from lexer.l:4:0:
./parser.tab.h:52:5: note: previous definition of ‘DIV’ was here
      DIV = 262,
      ^~~
lexer.l:12:2: error: redeclaration of enumerator ‘ABS’
   ABS = 290,
   ^~~
In file included from lexer.l:4:0:
./parser.tab.h:53:5: note: previous definition of ‘ABS’ was here
      ABS = 263,
      ^~~
lexer.l:13:2: error: redeclaration of enumerator ‘EOL’
   EOL = 291
   ^~~
In file included from lexer.l:4:0:
./parser.tab.h:54:5: note: previous definition of ‘EOL’ was here
      EOL = 264
      ^~~



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