//----------------------------------------------------------------------------------------
 //Factor
 public object VisitCharConstFactorAST(CharConstFactorAST v,object arg)
 {
     if(v.charconst.car.sym==sym.CHAR){
         return "char";
     }
     return null;
 }
        //----------------------------------------------------------------------------------------
        //Factor
        public object VisitCharConstFactorAST(CharConstFactorAST v,object arg)
        {
            int numaux = ((int)arg);
            printtab(numaux);
            resultado = resultado +"\n"+(v.GetType());

            if (v.charconst != null)
                v.charconst.visit(this,numaux+1);
            else{
                printtab(numaux+1);
                resultado = resultado +"\n"+("NULL");
            }
            return null;
        }