tests/test-modfl.c

   1 /* Test of modfl() function.
   2    Copyright (C) 2010-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2010.  */
  18
  19 #include <config.h>
  20
  21 #include <math.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (modfl, long double, (long double, long double *));
  25
  26 #include <float.h>
  27
  28 #include "fpucw.h"
  29 #include "macros.h"
  30
  31 #define DOUBLE long double
  32 #define L_(literal) literal##L
  33 #define MANT_DIG LDBL_MANT_DIG
  34 #define MODF modfl
  35 #define RANDOM randoml
  36 #include "test-modf.h"
  37
  38 int
  39 main ()
  40 {
  41   DECL_LONG_DOUBLE_ROUNDING
  42
  43   BEGIN_LONG_DOUBLE_ROUNDING ();
  44
  45   /* A particular positive value.  */
  46   x = 5.972406760L;
  47   y = modfl (x, &z);
  48   ASSERT (y >= 0.972406759L && y <= 0.972406761L);
  49   ASSERT (z == 5.0);
  50
  51   /* A particular negative value.  */
  52   x = -5.972406760L;
  53   y = modfl (x, &z);
  54   ASSERT (y >= -0.972406761L && y <= -0.972406759L);
  55   ASSERT (z == -5.0L);
  56
  57   test_function ();
  58
  59   return test_exit_status;
  60 }