t-set_q.c
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上传日期:2022-08-06
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- /* Test mpf_set_q.
- Copyright 2004 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <stdlib.h>
- #include "gmp.h"
- #include "gmp-impl.h"
- #include "tests.h"
- void
- check_one (mpf_ptr got, mpq_srcptr q)
- {
- mpf_t n, d;
- mpf_set_q (got, q);
- PTR(n) = PTR(&q->_mp_num);
- SIZ(n) = SIZ(&q->_mp_num);
- EXP(n) = ABSIZ(&q->_mp_num);
- PTR(d) = PTR(&q->_mp_den);
- SIZ(d) = SIZ(&q->_mp_den);
- EXP(d) = ABSIZ(&q->_mp_den);
- if (! refmpf_validate_division ("mpf_set_q", got, n, d))
- {
- mp_trace_base = -16;
- mpq_trace (" q", q);
- abort ();
- }
- }
- void
- check_rand (void)
- {
- unsigned long min_prec = __GMPF_BITS_TO_PREC (1);
- gmp_randstate_ptr rands = RANDS;
- unsigned long prec;
- mpf_t got;
- mpq_t q;
- int i;
- mpf_init (got);
- mpq_init (q);
- for (i = 0; i < 400; i++)
- {
- /* result precision */
- prec = min_prec + gmp_urandomm_ui (rands, 20L);
- refmpf_set_prec_limbs (got, prec);
- /* num */
- prec = gmp_urandomm_ui (rands, 20L * GMP_NUMB_BITS);
- mpz_rrandomb (mpq_numref(q), rands, prec);
- /* possibly negative num */
- if (gmp_urandomb_ui (rands, 1L))
- mpz_neg (mpq_numref(q), mpq_numref(q));
- /* den, non-zero */
- do {
- prec = gmp_urandomm_ui (rands, 20L * GMP_NUMB_BITS);
- mpz_rrandomb (mpq_denref(q), rands, prec);
- } while (mpz_sgn (mpq_denref(q)) <= 0);
- check_one (got, q);
- }
- mpf_clear (got);
- mpq_clear (q);
- }
- void
- check_various (void)
- {
- mpf_t got;
- mpq_t q;
- mpf_init (got);
- mpq_init (q);
- /* 1/1 == 1 */
- mpf_set_prec (got, 20L);
- mpq_set_ui (q, 1L, 1L);
- mpf_set_q (got, q);
- MPF_CHECK_FORMAT (got);
- ASSERT_ALWAYS (mpf_cmp_ui (got, 1L) == 0);
- /* 1/(2^n+1), a case where truncating the divisor would be wrong */
- mpf_set_prec (got, 500L);
- mpq_set_ui (q, 1L, 1L);
- mpz_mul_2exp (mpq_denref(q), mpq_denref(q), 800L);
- mpz_add_ui (mpq_denref(q), mpq_denref(q), 1L);
- check_one (got, q);
- mpf_clear (got);
- mpq_clear (q);
- }
- int
- main (void)
- {
- tests_start ();
- check_various ();
- check_rand ();
- tests_end ();
- exit (0);
- }