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112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/* Test of copysign() function.
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Copyright (C) 2010-2017 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2010. */
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#include <config.h>
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#include <math.h>
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#include "signature.h"
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SIGNATURE_CHECK (copysign, double, (double, double));
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#include "macros.h"
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#include "minus-zero.h"
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#include <string.h>
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volatile double x;
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volatile double y;
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double z;
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double zero = 0.0;
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int
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main ()
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{
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/* A particular value in the first quadrant. */
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x = 0.6;
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y = 0.8;
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z = copysign (x, y);
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ASSERT (z == 0.6);
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/* A particular value in the second quadrant. */
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x = -0.6;
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y = 0.8;
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z = copysign (x, y);
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ASSERT (z == 0.6);
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/* A particular value in the third quadrant. */
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x = -0.6;
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y = -0.8;
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z = copysign (x, y);
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ASSERT (z == -0.6);
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/* A particular value in the fourth quadrant. */
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x = 0.6;
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y = -0.8;
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z = copysign (x, y);
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ASSERT (z == -0.6);
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/* From signed zero. */
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x = 1.0;
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y = 0.0;
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z = copysign (x, y);
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ASSERT (z == 1.0);
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x = 1.0;
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y = minus_zerod;
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z = copysign (x, y);
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/* Assume all gnulib targets support -0.0, until proven otherwise. */
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ASSERT (z == -1.0);
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x = -1.0;
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y = 0.0;
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z = copysign (x, y);
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ASSERT (z == 1.0);
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x = -1.0;
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y = minus_zerod;
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z = copysign (x, y);
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ASSERT (z == -1.0);
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/* To signed zero. */
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x = 0.0;
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y = 1.0;
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z = copysign (x, y);
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ASSERT (z == 0.0);
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ASSERT (memcmp (&z, &zero, sizeof z) == 0);
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x = 0.0;
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y = -1.0;
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z = copysign (x, y);
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ASSERT (z == 0.0);
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ASSERT (memcmp (&z, &zero, sizeof z) != 0);
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x = minus_zerod;
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y = 1.0;
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z = copysign (x, y);
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ASSERT (z == 0.0);
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ASSERT (memcmp (&z, &zero, sizeof z) == 0);
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x = minus_zerod;
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y = -1.0;
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z = copysign (x, y);
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ASSERT (z == 0.0);
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ASSERT (memcmp (&z, &zero, sizeof z) != 0);
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return 0;
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}
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