mirror of
https://https.git.savannah.gnu.org/git/gnulib.git
synced 2026-09-01 02:34:55 +00:00
Jim Meyering
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/* 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;
|
|
}
|