1 /* mpc_mul_fr -- Multiply a complex number by a floating-point number. 2 3 Copyright (C) 2002, 2008, 2009, 2010, 2011 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 "mpc-impl.h" 22 23 int 24 mpc_mul_fr (mpc_ptr a, mpc_srcptr b, mpfr_srcptr c, mpc_rnd_t rnd) 25 { 26 int inex_re, inex_im; 27 mpfr_t real; 28 29 if (c == mpc_realref (a)) 30 /* We have to use a temporary variable. */ 31 mpfr_init2 (real, MPC_PREC_RE (a)); 32 else 33 real [0] = mpc_realref (a) [0]; 34 35 inex_re = mpfr_mul (real, mpc_realref(b), c, MPC_RND_RE(rnd)); 36 inex_im = mpfr_mul (mpc_imagref(a), mpc_imagref(b), c, MPC_RND_IM(rnd)); 37 mpfr_set (mpc_realref (a), real, GMP_RNDN); /* exact */ 38 39 if (c == mpc_realref (a)) 40 mpfr_clear (real); 41 42 return MPC_INEX(inex_re, inex_im); 43 } 44