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/* tsgn -- Test for the sign of a floating point number.
Copyright 2003 Free Software Foundation.
Contributed by the Spaces project, INRIA Lorraine.
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., 51 Franklin Place, Fifth Floor, Boston,
MA 02110-1301, USA. */
#include <stdio.h>
#include <stdlib.h>
#include "mpfr-test.h"
static void
check_special(void)
{
mpfr_t x;
int ret = 0;
mpfr_init(x);
MPFR_SET_ZERO(x);
if ((mpfr_sgn) (x) != 0)
{
printf("Sgn error for 0.\n");
ret = 1;
}
MPFR_SET_INF(x);
MPFR_SET_POS(x);
if ((mpfr_sgn) (x) != 1)
{
printf("Sgn error for +Inf.\n");
ret = 1;
}
MPFR_SET_INF(x);
MPFR_SET_NEG(x);
if ((mpfr_sgn) (x) != -1)
{
printf("Sgn error for -Inf.\n");
ret = 1;
}
mpfr_clear(x);
if (ret)
exit(ret);
}
static void
check_sgn(void)
{
mpfr_t x;
int i, s1, s2;
mpfr_init(x);
for(i = 0 ; i < 100 ; i++)
{
mpfr_random(x);
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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