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

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• Hash : 1602f0af
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  Date : 2012-01-01T10:04:58
  

  maint: update all copyright year number ranges
  
  Run "make update-copyright".
  

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• tests/test-copysign.c

• /* Test of copysign() function.
     Copyright (C) 2010-2012 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 <http://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2010.  */
  
  #include <config.h>
  
  #include <math.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (copysign, double, (double, double));
  
  #include "macros.h"
  #include "minus-zero.h"
  
  #include <string.h>
  
  volatile double x;
  volatile double y;
  double z;
  double zero = 0.0;
  
  int
  main ()
  {
    /* A particular value in the first quadrant.  */
    x = 0.6;
    y = 0.8;
    z = copysign (x, y);
    ASSERT (z == 0.6);
  
    /* A particular value in the second quadrant.  */
    x = -0.6;
    y = 0.8;
    z = copysign (x, y);
    ASSERT (z == 0.6);
  
    /* A particular value in the third quadrant.  */
    x = -0.6;
    y = -0.8;
    z = copysign (x, y);
    ASSERT (z == -0.6);
  
    /* A particular value in the fourth quadrant.  */
    x = 0.6;
    y = -0.8;
    z = copysign (x, y);
    ASSERT (z == -0.6);
  
    /* From signed zero.  */
    x = 1.0;
    y = 0.0;
    z = copysign (x, y);
    ASSERT (z == 1.0);
  
    x = 1.0;
    y = minus_zerod;
    z = copysign (x, y);
    /* Assume all gnulib targets support -0.0, until proven otherwise.  */
    ASSERT (z == -1.0);
  
    x = -1.0;
    y = 0.0;
    z = copysign (x, y);
    ASSERT (z == 1.0);
  
    x = -1.0;
    y = minus_zerod;
    z = copysign (x, y);
    ASSERT (z == -1.0);
  
    /* To signed zero.  */
    x = 0.0;
    y = 1.0;
    z = copysign (x, y);
    ASSERT (z == 0.0);
    ASSERT (memcmp (&z, &zero, sizeof z) == 0);
  
    x = 0.0;
    y = -1.0;
    z = copysign (x, y);
    ASSERT (z == 0.0);
    ASSERT (memcmp (&z, &zero, sizeof z) != 0);
  
    x = minus_zerod;
    y = 1.0;
    z = copysign (x, y);
    ASSERT (z == 0.0);
    ASSERT (memcmp (&z, &zero, sizeof z) == 0);
  
    x = minus_zerod;
    y = -1.0;
    z = copysign (x, y);
    ASSERT (z == 0.0);
    ASSERT (memcmp (&z, &zero, sizeof z) != 0);
  
    return 0;
  }
  

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