CODEWITHSUNDEEP
cyacclex
rJqnr
rJqnr

Reputation: 61

Yacc error request for member "Token" in something not a structure or union

I tried everything and I kept getting the following errors:

(line)20:31: error: request for member ‘val’ in something not a structure or union

(line)22:38: error: request for member ‘val’ in something not a structure or union

(line)27:108: error: request for member ‘val’ in something not a structure or union

%{
#include "y.tab.h"
%}

%option noyywrap
%option yylineno

%%
0|[1-9][0-9]* {yylval.val=atoi(yytext); return NUM;}
\*|\+         {yylval.val=yytext[0]=='+'?0:1; return OP;}
\(|\)          return yytext[0];
[ \t\n]       ;
.             yyerror("caracter invalido");

%%

And the yacc:

%{
#include<stdio.h>
#include<stdlib.h>
extern int yylineno;
%}

%union {struct nodo{int val; struct nodo *next} *p; int val;}
%start lexp
%token<val> OP NUM
%type<p> larg arg
%type<val> exp

%%

lexp    : lexp exp 
    |   
    ;
exp : '(' OP larg ')' {struct nodo *p=$3->next;int val=$3->val;
              while(p){
                val=$2.val?(val+p->val):(val*p->val);
                p=p->next;}
              printf("R:%d\n", val); $$.val=val;}
    ;
larg    : arg larg {$$=$1; $1->next=$2;}
    | arg arg  {$$=$1; $1->next=$2;}
    ;
arg : NUM {$$= (struct nodo *) malloc(sizeof(struct nodo)); $$->next=0; $$->val=$1.val;}
    | exp {$$= (struct nodo *) malloc(sizeof(struct nodo)); $$->next=0; $$->val=$1.val;}
    ;
%%
int yyerror(char *s){fprintf(stderr, "linha %d: %s\n", yylineno,s); return 0;}
int main(){
yyparse();
return 0;
}

Upvotes: 2

Views: 726

Answers (1)

user539810
user539810

Reputation:

Did you try removing the .val from things like $2.val? Because of your %token and %type lines and the <tag> construct, the particular field of the union is already determined. In other words, you're doing things like (yylval.val).val in the generated C code.

Upvotes: 1

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