view tests/test-modfl.c @ 16409:e0968c2ae37e

Tests for module 'modfl'. * modules/modfl-tests: New file. * tests/test-modfl.c: New file. * tests/test-math-c++.cc: Check the declaration of modfl.
author Bruno Haible <bruno@clisp.org>
date Sat, 25 Feb 2012 15:31:52 +0100
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children 3f4104450577
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/* Test of modfl() function.
   Copyright (C) 2010-2012 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 (modfl, long double, (long double, long double *));

#include "fpucw.h"
#include "macros.h"

volatile long double x;
long double y;
long double z;

int
main ()
{
  DECL_LONG_DOUBLE_ROUNDING

  BEGIN_LONG_DOUBLE_ROUNDING ();

  /* A particular positive value.  */
  x = 5.972406760L;
  y = modfl (x, &z);
  ASSERT (y >= 0.972406759L && y <= 0.972406761L);
  ASSERT (z == 5.0);

  /* A particular negative value.  */
  x = -5.972406760L;
  y = modfl (x, &z);
  ASSERT (y >= -0.972406761L && y <= -0.972406759L);
  ASSERT (z == -5.0L);

  return 0;
}