contrib/mpc/src/pow_d.c

   1 /* mpc_pow_d -- Raise a complex number to a double-precision power.
   2
   3 Copyright (C) 2009 INRIA
   4
   5 This file is part of GNU MPC.
   6
   7 GNU MPC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU Lesser General Public License as published by the
   9 Free Software Foundation; either version 3 of the License, or (at your
  10 option) any later version.
  11
  12 GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  14 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
  15 more details.
  16
  17 You should have received a copy of the GNU Lesser General Public License
  18 along with this program. If not, see http://www.gnu.org/licenses/ .
  19 */
  20
  21 #include <stdio.h>    /* for MPC_ASSERT */
  22 #include <float.h>    /* for DBL_MANT_DIG */
  23 #include "mpc-impl.h"
  24
  25 int
  26 mpc_pow_d (mpc_ptr z, mpc_srcptr x, double y, mpc_rnd_t rnd)
  27 {
  28   mpc_t yy;
  29   int inex;
  30
  31   MPC_ASSERT(FLT_RADIX == 2);
  32   mpc_init3 (yy, DBL_MANT_DIG, MPFR_PREC_MIN);
  33   mpc_set_d (yy, y, MPC_RNDNN);   /* exact */
  34   inex = mpc_pow (z, x, yy, rnd);
  35   mpc_clear (yy);
  36   return inex;
  37 }
  38