tests/test-atan2.c

   1 /* Test of atan2() function.
   2    Copyright (C) 2010-2020 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 (atan2, double, (double, double));
  25
  26 #include "macros.h"
  27
  28 volatile double x;
  29 volatile double y;
  30 double z;
  31
  32 int
  33 main ()
  34 {
  35   /* A particular value in the first quadrant.  */
  36   x = 0.6;
  37   y = 0.8;
  38   z = atan2 (y, x);
  39   ASSERT (z >= 0.9272952180 && z <= 0.9272952181);
  40
  41   /* A particular value in the second quadrant.  */
  42   x = -0.6;
  43   y = 0.8;
  44   z = atan2 (y, x);
  45   ASSERT (z >= 2.214297435 && z <= 2.214297436);
  46
  47   /* A particular value in the third quadrant.  */
  48   x = -0.6;
  49   y = -0.8;
  50   z = atan2 (y, x);
  51   ASSERT (z >= -2.214297436 && z <= -2.214297435);
  52
  53   /* A particular value in the fourth quadrant.  */
  54   x = 0.6;
  55   y = -0.8;
  56   z = atan2 (y, x);
  57   ASSERT (z >= -0.9272952181 && z <= -0.9272952180);
  58
  59   return 0;
  60 }