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/* Test of copysign() function.
Copyright (C) 2010 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2010. */
#include <config.h>
#include <math.h>
#include "signature.h"
SIGNATURE_CHECK (copysign, double, (double, double));
#include "macros.h"
#include "minus-zero.h"
#include <string.h>
volatile double x;
volatile double y;
double z;
double zero = 0.0;
int
main ()
{
/* A particular value in the first quadrant. */
x = 0.6;
y = 0.8;
z = copysign (x, y);
ASSERT (z == 0.6);
/* A particular value in the second quadrant. */
x = -0.6;
y = 0.8;
z = copysign (x, y);
ASSERT (z == 0.6);
/* A particular value in the third quadrant. */
x = -0.6;
y = -0.8;
z = copysign (x, y);
ASSERT (z == -0.6);
/* A particular value in the fourth quadrant. */
x = 0.6;
y = -0.8;
z = copysign (x, y);
ASSERT (z == -0.6);
/* From signed zero. */
x = 1.0;
y = 0.0;
z = copysign (x, y);
ASSERT (z == 1.0);
x = 1.0;
y = minus_zerod;
z = copysign (x, y);
/* Assume all gnulib targets support -0.0, until proven otherwise. */
ASSERT (z == -1.0);
x = -1.0;
y = 0.0;
z = copysign (x, y);
ASSERT (z == 1.0);
x = -1.0;
y = minus_zerod;
z = copysign (x, y);
ASSERT (z == -1.0);
/* To signed zero. */
x = 0.0;
y = 1.0;
z = copysign (x, y);
ASSERT (z == 0.0);
ASSERT (memcmp (&z, &zero, sizeof z) == 0);
x = 0.0;
y = -1.0;
z = copysign (x, y);
ASSERT (z == 0.0);
ASSERT (memcmp (&z, &zero, sizeof z) != 0);
x = minus_zerod;
y = 1.0;
z = copysign (x, y);
ASSERT (z == 0.0);
ASSERT (memcmp (&z, &zero, sizeof z) == 0);
x = minus_zerod;
y = -1.0;
z = copysign (x, y);
ASSERT (z == 0.0);
ASSERT (memcmp (&z, &zero, sizeof z) != 0);
return 0;
}
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