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/* Test file for mpfr_factorial.
Copyright 2001, 2002, 2003 Free Software Foundation.
Adapted from tarctan.c.
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"
#define TEST_FUNCTION mpfr_fac_ui
int
main (int argc, char *argv[])
{
unsigned int prec, err, yprec, n, k, zeros;
mp_rnd_t rnd;
mpfr_t x, y, z, t;
int inexact;
tests_start_mpfr ();
mpfr_init (x);
mpfr_init (y);
mpfr_init (z);
mpfr_init (t);
mpfr_fac_ui (y, 0, GMP_RNDN);
if (mpfr_cmp_ui (y, 1))
{
printf ("mpfr_fac_ui(0) does not give 1\n");
exit (1);
}
for (prec = 2; prec <= 100; prec++)
{
mpfr_set_prec (x, prec);
mpfr_set_prec (z, prec);
mpfr_set_prec (t, prec);
yprec = prec + 10;
mpfr_set_prec (y, yprec);
for (n=0; n<50; n++)
for (rnd=0; rnd<4; rnd++)
{
inexact = mpfr_fac_ui (y, n, rnd);
err = (rnd == GMP_RNDN) ? yprec + 1 : yprec;
if (mpfr_can_round (y, err, rnd, rnd, prec))
{
mpfr_set (t, y, rnd);
inexact = mpfr_fac_ui (z, n, rnd);
/* fact(n) ends with floor(n/2)+floor(n/4)+... zeros */
for (k=n/2, zeros=0; k; k >>= 1)
zeros += k;
if (MPFR_EXP(y) <= prec + zeros) /* result should be exact */
{
if (inexact)
{
printf ("Wrong inexact flag: expected exact\n");
exit (1);
}
}
else /* result is inexact */
{
if (!inexact)
{
printf ("Wrong inexact flag: expected inexact\n");
printf ("n=%u prec=%u\n", n, prec);
mpfr_print_binary(z); puts ("");
exit (1);
}
}
if (mpfr_cmp (t, z))
{
printf ("results differ for x=");
mpfr_out_str (stdout, 2, prec, x, GMP_RNDN);
printf (" prec=%u rnd_mode=%s\n", prec,
mpfr_print_rnd_mode (rnd));
printf (" got ");
mpfr_out_str (stdout, 2, prec, z, GMP_RNDN);
puts ("");
printf (" expected ");
mpfr_out_str (stdout, 2, prec, t, GMP_RNDN);
puts ("");
printf (" approximation was ");
mpfr_print_binary (y);
puts ("");
exit (1);
}
}
}
}
mpfr_clear (x);
mpfr_clear (y);
mpfr_clear (z);
mpfr_clear (t);
tests_end_mpfr ();
return 0;
}
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