kc3-lang/gnulib/tests/test-nextafter.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• tests/test-nextafter.c

• /* Test of nextafter() function.
     Copyright (C) 2010-2023 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 <https://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2010.  */
  
  #include <config.h>
  
  #include <math.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (nextafter, double, (double, double));
  
  #include "macros.h"
  
  volatile double x;
  double y;
  
  int
  main ()
  {
    /* A particular value.  */
    x = 1.628947572;
    /* Towards 0.  */
    y = nextafter (x, 0);
    ASSERT (y < x);
    ASSERT (y > 1.628947571);
    y = nextafter (y, x + x);
    ASSERT (y == x);
    /* Towards infinity.  */
    y = nextafter (x, x + x);
    ASSERT (y > x);
    ASSERT (y < 1.628947573);
    y = nextafter (y, 0);
    ASSERT (y == x);
    /* Towards itself.  */
    y = nextafter (x, x);
    ASSERT (y == x);
  
    return 0;
  }
  

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