1/* Test mpf_set_q.
2
3Copyright 2004 Free Software Foundation, Inc.
4
5This file is part of the GNU MP Library.
6
7The GNU MP Library is free software; you can redistribute it and/or modify
8it under the terms of the GNU Lesser General Public License as published by
9the Free Software Foundation; either version 3 of the License, or (at your
10option) any later version.
11
12The GNU MP Library is distributed in the hope that it will be useful, but
13WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15License for more details.
16
17You should have received a copy of the GNU Lesser General Public License
18along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
19
20#include <stdio.h>
21#include <stdlib.h>
22#include "gmp.h"
23#include "gmp-impl.h"
24#include "tests.h"
25
26
27void
28check_one (mpf_ptr got, mpq_srcptr q)
29{
30  mpf_t  n, d;
31
32  mpf_set_q (got, q);
33
34  PTR(n) = PTR(&q->_mp_num);
35  SIZ(n) = SIZ(&q->_mp_num);
36  EXP(n) = ABSIZ(&q->_mp_num);
37
38  PTR(d) = PTR(&q->_mp_den);
39  SIZ(d) = SIZ(&q->_mp_den);
40  EXP(d) = ABSIZ(&q->_mp_den);
41
42  if (! refmpf_validate_division ("mpf_set_q", got, n, d))
43    {
44      mp_trace_base = -16;
45      mpq_trace ("   q", q);
46      abort ();
47    }
48}
49
50void
51check_rand (void)
52{
53  unsigned long  min_prec = __GMPF_BITS_TO_PREC (1);
54  gmp_randstate_ptr  rands = RANDS;
55  unsigned long  prec;
56  mpf_t  got;
57  mpq_t  q;
58  int    i;
59
60  mpf_init (got);
61  mpq_init (q);
62
63  for (i = 0; i < 400; i++)
64    {
65      /* result precision */
66      prec = min_prec + gmp_urandomm_ui (rands, 20L);
67      refmpf_set_prec_limbs (got, prec);
68
69      /* num */
70      prec = gmp_urandomm_ui (rands, 20L * GMP_NUMB_BITS);
71      mpz_rrandomb (mpq_numref(q), rands, prec);
72
73      /* possibly negative num */
74      if (gmp_urandomb_ui (rands, 1L))
75        mpz_neg (mpq_numref(q), mpq_numref(q));
76
77      /* den, non-zero */
78      do {
79        prec = gmp_urandomm_ui (rands, 20L * GMP_NUMB_BITS);
80        mpz_rrandomb (mpq_denref(q), rands, prec);
81      } while (mpz_sgn (mpq_denref(q)) <= 0);
82
83      check_one (got, q);
84    }
85
86  mpf_clear (got);
87  mpq_clear (q);
88}
89
90void
91check_various (void)
92{
93  mpf_t got;
94  mpq_t q;
95
96  mpf_init (got);
97  mpq_init (q);
98
99  /* 1/1 == 1 */
100  mpf_set_prec (got, 20L);
101  mpq_set_ui (q, 1L, 1L);
102  mpf_set_q (got, q);
103  MPF_CHECK_FORMAT (got);
104  ASSERT_ALWAYS (mpf_cmp_ui (got, 1L) == 0);
105
106  /* 1/(2^n+1), a case where truncating the divisor would be wrong */
107  mpf_set_prec (got, 500L);
108  mpq_set_ui (q, 1L, 1L);
109  mpz_mul_2exp (mpq_denref(q), mpq_denref(q), 800L);
110  mpz_add_ui (mpq_denref(q), mpq_denref(q), 1L);
111  check_one (got, q);
112
113  mpf_clear (got);
114  mpq_clear (q);
115}
116
117int
118main (void)
119{
120  tests_start ();
121
122  check_various ();
123  check_rand ();
124
125  tests_end ();
126  exit (0);
127}
128