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/* Test of nextafter() function.
Copyright (C) 2010-2017 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 <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2010. */
#include <config.h>
#include <math.h>
#include "signature.h"
SIGNATURE_CHECK (nextafter, double, (double, double));
#include "macros.h"
volatile double x;
double y;
int
main ()
{
/* A particular value. */
x = 1.628947572;
/* Towards 0. */
y = nextafter (x, 0);
ASSERT (y < x);
ASSERT (y > 1.628947571);
y = nextafter (y, x + x);
ASSERT (y == x);
/* Towards infinity. */
y = nextafter (x, x + x);
ASSERT (y > x);
ASSERT (y < 1.628947573);
y = nextafter (y, 0);
ASSERT (y == x);
/* Towards itself. */
y = nextafter (x, x);
ASSERT (y == x);
return 0;
}
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