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/* Test file for mpfr_const_log2.
Copyright 1999, 2001, 2002 Free Software Foundation, Inc.
This file is part of the MPFR Library.
The 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 2.1 of the License, or (at your
option) any later version.
The 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 MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include <stdlib.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
#include "mpfr-test.h"
/* tlog2 [prec] [rnd] [0 = no print] */
static void
check (mp_prec_t p0, mp_prec_t p1)
{
mpfr_t x, y, z;
mp_rnd_t rnd;
mpfr_init (x);
mpfr_init (y);
mpfr_init2 (z, p1 + 10);
mpfr_const_log2 (z, GMP_RNDN);
__gmpfr_const_log2_prec = 1;
for (; p0<=p1; p0++)
{
mpfr_set_prec (x, p0);
mpfr_set_prec (y, p0);
for (rnd = 0; rnd < 4; rnd++)
{
mpfr_const_log2 (x, rnd);
mpfr_set (y, z, rnd);
if (mpfr_cmp (x, y) && mpfr_can_round (z, mpfr_get_prec(z), GMP_RNDN,
rnd, p0))
{
fprintf (stderr, "mpfr_const_log2 fails for prec=%u, rnd=%s\n",
(unsigned int) p0, mpfr_print_rnd_mode (rnd));
fprintf (stderr, "expected ");
mpfr_out_str (stderr, 2, 0, y, GMP_RNDN);
fprintf (stderr, "\ngot ");
mpfr_out_str (stderr, 2, 0, x, GMP_RNDN);
fprintf (stderr, "\n");
exit (1);
}
}
}
mpfr_clear (x);
mpfr_clear (y);
mpfr_clear (z);
}
int
main (int argc, char *argv[])
{
mpfr_t x;
int p;
mp_rnd_t rnd;
tests_start_mpfr ();
p = (argc>1) ? atoi(argv[1]) : 53;
rnd = (argc>2) ? atoi(argv[2]) : GMP_RNDZ;
mpfr_init (x);
check (2, 1000);
/* check precision of 2 bits */
mpfr_set_prec (x, 2);
mpfr_const_log2 (x, GMP_RNDN);
if (mpfr_get_d1 (x) != 0.75)
{
fprintf (stderr, "mpfr_const_log2 failed for prec=2, rnd=GMP_RNDN\n");
fprintf (stderr, "expected 0.75, got %f\n", mpfr_get_d1 (x));
exit (1);
}
if (argc>=2)
{
mpfr_set_prec (x, p);
mpfr_const_log2 (x, rnd);
printf ("log(2)=");
mpfr_out_str (stdout, 10, 0, x, rnd);
puts ("");
}
mpfr_set_prec (x, 53);
mpfr_const_log2 (x, rnd);
if (mpfr_get_d1 (x) != 6.9314718055994530941e-1)
{
fprintf (stderr, "mpfr_const_log2 failed for prec=53\n");
exit (1);
}
mpfr_clear(x);
tests_end_mpfr ();
return 0;
}
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