1  typedef union
       2  {
       3    char *string;
       4    double dval;
       5    float fval;
       6  } yystype;
       7  char *f(void)
       8  {
       9    yystype tok;
      10    tok.dval = 0;
      11    return (tok.string);
      12  }
      13  char *f1(void)
      14  {
      15    yystype tok;
      16    tok.fval = 0;
      17    return (tok.string);
      18  }
      19