tests/test-tanh.c

   1 /* Test of tanh() function.
   2    Copyright (C) 2010-2018 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 (tanh, double, (double));
  25
  26 #include "macros.h"
  27
  28 volatile double x;
  29 double y;
  30
  31 int
  32 main ()
  33 {
  34   /* A particular value.  */
  35   x = 0.6;
  36   y = tanh (x);
  37   ASSERT (y >= 0.5370495669 && y <= 0.5370495670);
  38
  39   return 0;
  40 }