diff options
Diffstat (limited to 'lib/copysign.c')
-rw-r--r-- | lib/copysign.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/lib/copysign.c b/lib/copysign.c new file mode 100644 index 000000000..a0d2b6806 --- /dev/null +++ b/lib/copysign.c @@ -0,0 +1,26 @@ +/* Copy sign into another 'double' number. + Copyright (C) 2011-2017 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Lesser 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 Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +#include <config.h> + +/* Specification. */ +#include <math.h> + +double +copysign (double x, double y) +{ + return (signbit (x) != signbit (y) ? - x : x); +} |