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Annotation of OpenXM_contrib/gmp/tests/rand/zdiv_round.c, Revision 1.1.1.2

1.1       maekawa     1: /* zdiv_round() -- divide integers, round to nearest */
                      2:
                      3: /*
1.1.1.2 ! ohara       4: Copyright 1999 Free Software Foundation, Inc.
1.1       maekawa     5:
                      6: This file is part of the GNU MP Library.
                      7:
                      8: The GNU MP Library is free software; you can redistribute it and/or modify
                      9: it under the terms of the GNU Lesser General Public License as published by
                     10: the Free Software Foundation; either version 2.1 of the License, or (at your
                     11: option) any later version.
                     12:
                     13: The GNU MP Library is distributed in the hope that it will be useful, but
                     14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Lesser General Public License
                     19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: MA 02111-1307, USA.
                     22: */
                     23:
                     24: #include "gmp.h"
                     25:
                     26: void
                     27: zdiv_round (mpz_t rop, mpz_t n, mpz_t d)
                     28: {
                     29:   mpf_t f_n, f_d;
                     30:
                     31:   mpf_init (f_n);
                     32:   mpf_init (f_d);
                     33:
                     34:   mpf_set_z (f_d, d);
                     35:   mpf_set_z (f_n, n);
                     36:
                     37:   mpf_div (f_n, f_n, f_d);
                     38:   mpf_set_d (f_d, .5);
                     39:   if (mpf_sgn (f_n) < 0)
                     40:     mpf_neg (f_d, f_d);
                     41:   mpf_add (f_n, f_n, f_d);
                     42:   mpz_set_f (rop, f_n);
                     43:
                     44:   mpf_clear (f_n);
                     45:   mpf_clear (f_d);
                     46:   return;
                     47: }