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974e12c1f0
Old version was 3.1.2 and is quite old: 2013-03-13 A lot has happened since then 4.0.1 is from 2018-02-07
122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/* Test file for mpfr_prec_round.
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Copyright 1999-2004, 2006-2018 Free Software Foundation, Inc.
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Contributed by the AriC and Caramba projects, INRIA.
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This file is part of the GNU MPFR Library.
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The GNU MPFR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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The GNU MPFR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
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http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include "mpfr-test.h"
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int
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main (void)
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{
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mpfr_t x;
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mpfr_exp_t emax;
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tests_start_mpfr ();
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mpfr_init (x);
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mpfr_set_nan (x);
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mpfr_prec_round (x, 2, MPFR_RNDN);
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MPFR_ASSERTN(mpfr_nan_p (x));
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mpfr_set_inf (x, 1);
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mpfr_prec_round (x, 2, MPFR_RNDN);
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MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
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mpfr_set_inf (x, -1);
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mpfr_prec_round (x, 2, MPFR_RNDN);
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MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) < 0);
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mpfr_set_ui (x, 0, MPFR_RNDN);
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mpfr_prec_round (x, 2, MPFR_RNDN);
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MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x));
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mpfr_set_ui (x, 0, MPFR_RNDN);
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mpfr_neg (x, x, MPFR_RNDN);
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mpfr_prec_round (x, 2, MPFR_RNDN);
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MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_NEG(x));
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emax = mpfr_get_emax ();
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set_emax (0);
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mpfr_set_prec (x, 3);
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mpfr_set_str_binary (x, "0.111");
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mpfr_prec_round (x, 2, MPFR_RNDN);
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MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);
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set_emax (emax);
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mpfr_set_prec (x, mp_bits_per_limb + 2);
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mpfr_set_ui (x, 1, MPFR_RNDN);
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mpfr_nextbelow (x);
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mpfr_prec_round (x, mp_bits_per_limb + 1, MPFR_RNDN);
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MPFR_ASSERTN(mpfr_cmp_ui (x, 1) == 0);
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mpfr_set_prec (x, 3);
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mpfr_set_ui (x, 5, MPFR_RNDN);
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mpfr_prec_round (x, 2, MPFR_RNDN);
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if (mpfr_cmp_ui(x, 4))
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{
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printf ("Error in tround: got ");
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mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN);
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printf (" instead of 4\n");
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exit (1);
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}
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/* check case when reallocation is needed */
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mpfr_set_prec (x, 3);
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mpfr_set_ui (x, 5, MPFR_RNDN); /* exact */
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mpfr_prec_round (x, mp_bits_per_limb + 1, MPFR_RNDN);
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if (mpfr_cmp_ui(x, 5))
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{
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printf ("Error in tround: got ");
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mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN);
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printf (" instead of 5\n");
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exit (1);
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}
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mpfr_clear(x);
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mpfr_init2 (x, 3);
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mpfr_set_si (x, -5, MPFR_RNDN); /* exact */
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mpfr_prec_round (x, mp_bits_per_limb + 1, MPFR_RNDN);
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if (mpfr_cmp_si(x, -5))
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{
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printf ("Error in tround: got ");
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mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN);
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printf (" instead of -5\n");
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exit (1);
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}
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/* check case when new precision needs less limbs */
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mpfr_set_prec (x, mp_bits_per_limb + 1);
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mpfr_set_ui (x, 5, MPFR_RNDN); /* exact */
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mpfr_prec_round (x, 3, MPFR_RNDN); /* exact */
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if (mpfr_cmp_ui(x, 5))
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{
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printf ("Error in tround: got ");
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mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN);
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printf (" instead of 5\n");
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exit (1);
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}
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mpfr_clear(x);
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tests_end_mpfr ();
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return 0;
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}
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