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/* mpfr_tgamma -- test file for gamma function
Copyright 2001 Free Software Foundation.
This file is part of the MPFR Library, and was contributed by Mathieu Dutour.
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 <mpfr.h>
int mpfr_gamma (mpfr_ptr, mpfr_srcptr, mp_rnd_t);
int
main (void)
{
unsigned int prec, err, yprec, n;
mp_rnd_t rnd;
mpfr_t x, y, z;
mpfr_init (x);
mpfr_init (y);
mpfr_init (z);
for (prec = 1; prec <= 100; prec++)
{
mpfr_set_prec (x, prec);
mpfr_set_prec (z, prec);
yprec = prec + 10;
for (n=0; n<100; n++)
{
mpfr_random (x);
rnd = random () % 4;
mpfr_set_prec (y, yprec);
mpfr_gamma (y, x, rnd);
err = (rnd == GMP_RNDN) ? yprec + 1 : yprec;
if (mpfr_can_round (y, err, rnd, rnd, prec))
{
mpfr_round_prec (y, rnd, prec);
mpfr_gamma (z, x, rnd);
if (mpfr_cmp (y, 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);
putchar ('\n');
printf (" expected ");
mpfr_out_str (stdout, 2, prec, y, GMP_RNDN);
putchar ('\n');
}
}
}
}
mpfr_clear (x);
mpfr_clear (y);
mpfr_clear (z);
return 0;
}
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