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/* tsgn -- Test for the sign of a floating point number.
Copyright 2003, 2006-2025 Free Software Foundation, Inc.
Contributed by the Pascaline 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 <https://www.gnu.org/licenses/>. */
#define MPFR_TESTS_TSGN 1
#include "mpfr-test.h"
static void
mpfr_sgn_test (mpfr_srcptr x, int res)
{
mpfr_exp_t old_emin, old_emax, e;
mpfr_flags_t flags;
int i, v;
old_emin = mpfr_get_emin ();
old_emax = mpfr_get_emax ();
for (i = 0; i <= 1; i++)
{
if (i != 0)
{
e = MPFR_IS_SINGULAR (x) ? MPFR_EMIN_MIN : mpfr_get_exp (x);
set_emin (e);
set_emax (e);
}
for (flags = 0; flags <= MPFR_FLAGS_ALL; flags++)
{
__gmpfr_flags = flags;
v = (mpfr_sgn) (x);
MPFR_ASSERTN (__gmpfr_flags == flags);
if (VSIGN (v) != res)
{
printf ("mpfr_sgn function error (got %d) for ", v);
mpfr_dump (x);
exit (1);
}
v = mpfr_sgn (x);
MPFR_ASSERTN (__gmpfr_flags == flags);
if (VSIGN (v) != res)
{
printf ("mpfr_sgn macro error (got %d) for ", v);
mpfr_dump (x);
exit (1);
}
}
}
set_emin (old_emin);
set_emax (old_emax);
}
static void
check_special (void)
{
mpfr_t x;
int i;
mpfr_init (x);
for (i = 1; i >= -1; i -= 2)
{
mpfr_set_zero (x, i);
mpfr_sgn_test (x, 0);
mpfr_set_inf (x, i);
mpfr_sgn_test (x, i);
mpfr_set_si (x, i, MPFR_RNDN);
mpfr_sgn_test (x, i);
}
MPFR_SET_NAN (x);
mpfr_clear_flags ();
if ((mpfr_sgn) (x) != 0 || !mpfr_erangeflag_p ())
{
printf ("Sgn error for NaN.\n");
exit (1);
}
mpfr_clear_flags ();
if (mpfr_sgn (x) != 0 || !mpfr_erangeflag_p ())
{
printf ("Sgn error for NaN.\n");
exit (1);
}
mpfr_clear (x);
}
static void
check_sgn(void)
{
mpfr_t x;
int i, s1, s2;
mpfr_init(x);
for(i = 0 ; i < 100 ; i++)
{
mpfr_urandomb (x, RANDS);
if (i&1)
{
MPFR_SET_POS(x);
s2 = 1;
}
else
{
MPFR_SET_NEG(x);
s2 = -1;
}
s1 = mpfr_sgn(x);
if (s1 < -1 || s1 > 1)
{
printf("Error for sgn: out of range.\n");
goto lexit;
}
else if (MPFR_IS_NAN(x) || MPFR_IS_ZERO(x))
{
if (s1 != 0)
{
printf("Error for sgn: Nan or Zero should return 0.\n");
goto lexit;
}
}
else if (s1 != s2)
{
printf("Error for sgn. Return %d instead of %d.\n", s1, s2);
goto lexit;
}
}
mpfr_clear(x);
return;
lexit:
mpfr_clear(x);
exit(1);
}
int
main (int argc, char *argv[])
{
tests_start_mpfr ();
check_special ();
check_sgn ();
tests_end_mpfr ();
return 0;
}
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