**(p1) public

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static VALUE
nurat_expt(VALUE self, VALUE other)
{
    if (k_exact_p(other) && f_zero_p(other))
        return f_rational_new_bang1(CLASS_OF(self), ONE);

    if (k_rational_p(other)) {
        get_dat1(other);

        if (f_one_p(dat->den))
            other = dat->num; /* good? */
    }

    switch (TYPE(other)) {
      case T_FIXNUM:
      case T_BIGNUM:
        {
            VALUE num, den;

            get_dat1(self);

            switch (FIX2INT(f_cmp(other, ZERO))) {
              case 1:
                num = f_expt(dat->num, other);
                den = f_expt(dat->den, other);
                break;
              case -1:
                num = f_expt(dat->den, f_negate(other));
                den = f_expt(dat->num, f_negate(other));
                break;
              default:
                num = ONE;
                den = ONE;
                break;
            }
            return f_rational_new2(CLASS_OF(self), num, den);
        }
      case T_FLOAT:
      case T_RATIONAL:
        return f_expt(f_to_f(self), other);
      default:
        return rb_num_coerce_bin(self, other, id_expt);
    }
}
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