tests/test-modf.c

   1 /* Test of modf() 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 (modf, double, (double, double *));
  25
  26 #include <float.h>
  27
  28 #include "macros.h"
  29
  30 #define DOUBLE double
  31 #define L_(literal) literal
  32 #define MANT_DIG DBL_MANT_DIG
  33 #define MODF modf
  34 #define RANDOM randomd
  35 #include "test-modf.h"
  36
  37 int
  38 main ()
  39 {
  40   /* A particular positive value.  */
  41   x = 5.972406760;
  42   y = modf (x, &z);
  43   ASSERT (y >= 0.972406759 && y <= 0.972406761);
  44   ASSERT (z == 5.0);
  45
  46   /* A particular negative value.  */
  47   x = -5.972406760;
  48   y = modf (x, &z);
  49   ASSERT (y >= -0.972406761 && y <= -0.972406759);
  50   ASSERT (z == -5.0);
  51
  52   test_function ();
  53
  54   return test_exit_status;
  55 }