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/* Test file for mpfr_sqrt_ui.
Copyright 2000, 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. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "gmp.h"
#include "mpfr.h"
#include "mpfr-test.h"
void check _PROTO((unsigned long, mp_rnd_t, double));
int maxulp=0;
void
check (unsigned long a, mp_rnd_t rnd_mode, double Q)
{
mpfr_t q; double Q2; int u, ck;
mpfr_init2(q, 53);
#ifdef HAVE_FENV_H
mpfr_set_machine_rnd_mode(rnd_mode);
#endif
mpfr_sqrt_ui(q, a, rnd_mode);
ck = (Q >= 0.0);
if (!ck) Q = sqrt(1.0 * a);
Q2 = mpfr_get_d(q);
if (Q!=Q2 && (!isnan(Q) || !isnan(Q2))) {
u = ulp(Q2,Q);
if (ck) printf("mpfr_sqrt_ui failed");
else printf("mpfr_sqrt_ui differs from sqrt");
printf(" for a=%lu, rnd_mode=%s\n",
a, mpfr_print_rnd_mode(rnd_mode));
printf("sqrt gives %1.20e, mpfr_sqrt_ui gives %1.20e (%d ulp)\n",Q,Q2,u);
exit(1);
}
mpfr_clear(q);
}
int
main (void)
{
#ifdef HAVE_FENV_H
int i;
unsigned long a;
mpfr_test_init ();
SEED_RAND (time(NULL));
for (i=0;i<1000000;i++)
{
a = LONG_RAND();
/* machine arithmetic must agree if a <= 2.0^53 */
if (1.0*a < 9007199254872064.0)
check(a, LONG_RAND() % 4, -1.0);
}
#endif
check (0, GMP_RNDN, 0.0);
check (2116118, GMP_RNDU, 1.45468828276026215e3);
return 0;
}
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