Mercurial > hg > octave-lojdl > gnulib-hg
annotate tests/test-copysign.c @ 14079:97fc9a21a8fb
maint: update almost all copyright ranges to include 2011
Run the new "make update-copyright" rule.
| author | Jim Meyering <meyering@redhat.com> |
|---|---|
| date | Sat, 01 Jan 2011 20:17:23 +0100 |
| parents | 2ba13be8e841 |
| children | 8250f2777afc |
| rev | line source |
|---|---|
| 12783 | 1 /* Test of copysign() function. |
|
14079
97fc9a21a8fb
maint: update almost all copyright ranges to include 2011
Jim Meyering <meyering@redhat.com>
parents:
13836
diff
changeset
|
2 Copyright (C) 2010-2011 Free Software Foundation, Inc. |
| 12783 | 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 <http://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 (copysign, double, (double, double)); | |
| 25 | |
| 26 #include "macros.h" | |
| 13836 | 27 #include "minus-zero.h" |
| 28 | |
| 29 #include <string.h> | |
| 12783 | 30 |
| 31 volatile double x; | |
| 32 volatile double y; | |
| 33 double z; | |
| 13836 | 34 double zero = 0.0; |
| 12783 | 35 |
| 36 int | |
| 37 main () | |
| 38 { | |
| 39 /* A particular value in the first quadrant. */ | |
| 40 x = 0.6; | |
| 41 y = 0.8; | |
| 42 z = copysign (x, y); | |
| 43 ASSERT (z == 0.6); | |
| 44 | |
| 45 /* A particular value in the second quadrant. */ | |
| 46 x = -0.6; | |
| 47 y = 0.8; | |
| 48 z = copysign (x, y); | |
| 49 ASSERT (z == 0.6); | |
| 50 | |
| 51 /* A particular value in the third quadrant. */ | |
| 52 x = -0.6; | |
| 53 y = -0.8; | |
| 54 z = copysign (x, y); | |
| 55 ASSERT (z == -0.6); | |
| 56 | |
| 57 /* A particular value in the fourth quadrant. */ | |
| 58 x = 0.6; | |
| 59 y = -0.8; | |
| 60 z = copysign (x, y); | |
| 61 ASSERT (z == -0.6); | |
| 62 | |
| 13836 | 63 /* From signed zero. */ |
| 64 x = 1.0; | |
| 65 y = 0.0; | |
| 66 z = copysign (x, y); | |
| 67 ASSERT (z == 1.0); | |
| 68 | |
| 69 x = 1.0; | |
| 70 y = minus_zerod; | |
| 71 z = copysign (x, y); | |
| 72 /* Assume all gnulib targets support -0.0, until proven otherwise. */ | |
| 73 ASSERT (z == -1.0); | |
| 74 | |
| 75 x = -1.0; | |
| 76 y = 0.0; | |
| 77 z = copysign (x, y); | |
| 78 ASSERT (z == 1.0); | |
| 79 | |
| 80 x = -1.0; | |
| 81 y = minus_zerod; | |
| 82 z = copysign (x, y); | |
| 83 ASSERT (z == -1.0); | |
| 84 | |
| 85 /* To signed zero. */ | |
| 86 x = 0.0; | |
| 87 y = 1.0; | |
| 88 z = copysign (x, y); | |
| 89 ASSERT (z == 0.0); | |
| 90 ASSERT (memcmp (&z, &zero, sizeof z) == 0); | |
| 91 | |
| 92 x = 0.0; | |
| 93 y = -1.0; | |
| 94 z = copysign (x, y); | |
| 95 ASSERT (z == 0.0); | |
| 96 ASSERT (memcmp (&z, &zero, sizeof z) != 0); | |
| 97 | |
| 98 x = minus_zerod; | |
| 99 y = 1.0; | |
| 100 z = copysign (x, y); | |
| 101 ASSERT (z == 0.0); | |
| 102 ASSERT (memcmp (&z, &zero, sizeof z) == 0); | |
| 103 | |
| 104 x = minus_zerod; | |
| 105 y = -1.0; | |
| 106 z = copysign (x, y); | |
| 107 ASSERT (z == 0.0); | |
| 108 ASSERT (memcmp (&z, &zero, sizeof z) != 0); | |
| 109 | |
| 12783 | 110 return 0; |
| 111 } |