1  /* zdiv_round() -- divide integers, round to nearest */
       2  
       3  /*
       4  Copyright 1999 Free Software Foundation, Inc.
       5  
       6  This file is part of the GNU MP Library test suite.
       7  
       8  The GNU MP Library test suite is free software; you can redistribute it
       9  and/or modify it under the terms of the GNU General Public License as
      10  published by the Free Software Foundation; either version 3 of the License,
      11  or (at your option) any later version.
      12  
      13  The GNU MP Library test suite is distributed in the hope that it will be
      14  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
      15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
      16  Public License for more details.
      17  
      18  You should have received a copy of the GNU General Public License along with
      19  the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
      20  
      21  
      22  void
      23  zdiv_round (mpz_t rop, mpz_t n, mpz_t d)
      24  {
      25    mpf_t f_n, f_d;
      26  
      27    mpf_init (f_n);
      28    mpf_init (f_d);
      29  
      30    mpf_set_z (f_d, d);
      31    mpf_set_z (f_n, n);
      32  
      33    mpf_div (f_n, f_n, f_d);
      34    mpf_set_d (f_d, .5);
      35    if (mpf_sgn (f_n) < 0)
      36      mpf_neg (f_d, f_d);
      37    mpf_add (f_n, f_n, f_d);
      38    mpz_set_f (rop, f_n);
      39  
      40    mpf_clear (f_n);
      41    mpf_clear (f_d);
      42    return;
      43  }