contrib/mpc/src/sub_fr.c

   1 /* mpc_sub_fr -- Substract a floating-point number to the real part of a
   2    complex number.
   3
   4 Copyright (C) 2008, 2009, 2011 INRIA
   5
   6 This file is part of GNU MPC.
   7
   8 GNU MPC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU Lesser General Public License as published by the
  10 Free Software Foundation; either version 3 of the License, or (at your
  11 option) any later version.
  12
  13 GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
  16 more details.
  17
  18 You should have received a copy of the GNU Lesser General Public License
  19 along with this program. If not, see http://www.gnu.org/licenses/ .
  20 */
  21
  22 #include "mpc-impl.h"
  23
  24 /* return 0 iff both the real and imaginary parts are exact */
  25 int
  26 mpc_sub_fr (mpc_ptr a, mpc_srcptr b, mpfr_srcptr c, mpc_rnd_t rnd)
  27 {
  28   int inex_re, inex_im;
  29
  30   inex_re = mpfr_sub (mpc_realref(a), mpc_realref(b), c, MPC_RND_RE(rnd));
  31   inex_im = mpfr_set (mpc_imagref(a), mpc_imagref(b), MPC_RND_IM(rnd));
  32
  33   return MPC_INEX(inex_re, inex_im);
  34 }