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/* Test of logb() function.
Copyright (C) 2010-2011 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 (logb, double, (double));
#include <float.h>
#include "macros.h"
volatile double x;
double y;
int
main ()
{
/* Some particular values. */
x = 0.6;
y = logb (x);
ASSERT (y == -1.0);
x = 1.2;
y = logb (x);
ASSERT (y == 0.0);
x = 2.1;
y = logb (x);
ASSERT (y == 1.0);
x = 3.9;
y = logb (x);
ASSERT (y == 1.0);
x = 4.0;
y = logb (x);
ASSERT (y == (FLT_RADIX == 2 ? 2.0 : 1.0));
x = 0.25;
y = logb (x);
ASSERT (y == (FLT_RADIX == 2 ? -2.0 : -1.0));
return 0;
}
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