/* Test file for mpfr_const_pi.
Copyright 1999, 2001-2017 Free Software Foundation, Inc.
Contributed by the AriC and Caramba projects, INRIA.
This file is part of the GNU MPFR Library.
The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LESSER. If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <stdio.h>
#include <stdlib.h>
#include "mpfr-test.h"
/* tconst_pi [prec] [rnd] [0 = no print] */
static void
check_large (void)
{
mpfr_t x, y, z;
mpfr_init2 (x, 20000);
mpfr_init2 (y, 21000);
mpfr_init2 (z, 11791);
/* The algo failed to round for p=11791. */
(mpfr_const_pi) (z, MPFR_RNDU);
mpfr_const_pi (x, MPFR_RNDN); /* First one ! */
mpfr_const_pi (y, MPFR_RNDN); /* Then the other - cache - */
mpfr_prec_round (y, 20000, MPFR_RNDN);
if (mpfr_cmp (x, y)) {
printf ("const_pi: error for large prec (%d)\n", 1);
exit (1);
}
mpfr_prec_round (y, 11791, MPFR_RNDU);
if (mpfr_cmp (z, y)) {
printf ("const_pi: error for large prec (%d)\n", 2);
exit (1);
}
/* a worst-case to exercise recomputation */
if (MPFR_PREC_MAX > 33440) {
mpfr_set_prec (x, 33440);
mpfr_const_pi (x, MPFR_RNDZ);
}
mpfr_clears (x, y, z, (mpfr_ptr) 0);
}
/* Wrapper for tgeneric */
static int
my_const_pi (mpfr_ptr x, mpfr_srcptr y, mpfr_rnd_t r)
{
return mpfr_const_pi (x, r);
}
#define RAND_FUNCTION(x) mpfr_set_ui ((x), 0, MPFR_RNDN)
#define TEST_FUNCTION my_const_pi
#include "tgeneric.c"
static void
bug20091030 (void)
{
mpfr_t x, x_ref;
int inex, inex_ref;
mpfr_prec_t p;
int r;
mpfr_free_cache ();
mpfr_init2 (x, MPFR_PREC_MIN);
for (p = MPFR_PREC_MIN; p <= 100; p++)
{
mpfr_set_prec (x, p);
inex = mpfr_const_pi (x, MPFR_RNDU);
if (inex < 0)
{
printf ("Error, inex < 0 for RNDU (prec=%lu)\n",
(unsigned long) p);
exit (1);
}
inex = mpfr_const_pi (x, MPFR_RNDD);
if (inex > 0)
{
printf ("Error, inex > 0 for RNDD (prec=%lu)\n",
(unsigned long) p);
exit (1);
}
}
mpfr_free_cache ();
mpfr_init2 (x_ref, MPFR_PREC_MIN);
for (p = MPFR_PREC_MIN; p <= 100; p++)
{
mpfr_set_prec (x, p + 10);
mpfr_const_pi (x, MPFR_RNDN);
mpfr_set_prec (x, p);
mpfr_set_prec (x_ref, p);
for (r = 0; r < MPFR_RND_MAX; r++)
{
inex = mpfr_const_pi (x, (mpfr_rnd_t) r);
inex_ref = mpfr_const_pi_internal (x_ref, (mpfr_rnd_t) r);
if (inex != inex_ref || mpfr_cmp (x, x_ref) != 0)
{
printf ("mpfr_const_pi and mpfr_const_pi_internal disagree\n");
printf ("mpfr_const_pi gives ");
mpfr_dump (x);
printf ("mpfr_const_pi_internal gives ");
mpfr_dump (x_ref);
printf ("inex=%d inex_ref=%d\n", inex, inex_ref);
exit (1);
}
}
}
mpfr_clear (x);
mpfr_clear (x_ref);
}
int
main (int argc, char *argv[])
{
mpfr_t x;
mpfr_prec_t p;
mpfr_rnd_t rnd;
tests_start_mpfr ();
p = 53;
if (argc > 1)
{
long a = atol (argv[1]);
if (a >= MPFR_PREC_MIN && a <= MPFR_PREC_MAX)
p = a;
}
rnd = (argc > 2) ? (mpfr_rnd_t) atoi(argv[2]) : MPFR_RNDZ;
mpfr_init2 (x, p);
mpfr_const_pi (x, rnd);
if (argc >= 2)
{
if (argc < 4 || atoi (argv[3]) != 0)
{
printf ("Pi=");
mpfr_out_str (stdout, 10, 0, x, rnd);
puts ("");
}
}
else if (mpfr_cmp_str1 (x, "3.141592653589793116") )
{
printf ("mpfr_const_pi failed for prec=53\n");
mpfr_out_str (stdout, 10, 0, x, MPFR_RNDN); putchar('\n');
exit (1);
}
mpfr_set_prec (x, 32);
mpfr_const_pi (x, MPFR_RNDN);
if (mpfr_cmp_str1 (x, "3.141592653468251") )
{
printf ("mpfr_const_pi failed for prec=32\n");
exit (1);
}
mpfr_clear (x);
bug20091030 ();
check_large ();
test_generic (2, 200, 1);
tests_end_mpfr ();
return 0;
}