COPYSIGN(3) | Linux Programmer's Manual | COPYSIGN(3) |
NAME
copysign, copysignf, copysignl - copy sign of a numberSYNOPSIS
#include<math.h>
double copysign(double x , double y );
float copysignf(float x , float y );
long double copysignl(long double x , long double y );
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
DESCRIPTION
The copysign() functions return a value whose absolute value matches that of x, but whose sign bit matches that of y.RETURN VALUE
On success, these functions return a value whose magnitude is taken from x and whose sign is taken from y.ERRORS
No errors occur.CONFORMING TO
C99, POSIX.1-2001. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).NOTES
On architectures where the floating-point formats are not IEEE 754 compliant, the copysign() functions may treat a negative zero as positive.SEE ALSO
signbit(3)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.2012-03-25 | GNU |