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);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
copysign(), copysignf(), copysignl():
-
_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.For example, copysign(42.0, -1.0) and copysign(-42.0, -1.0) both return -42.0.
RETURN VALUE
On success, these functions return a value whose magnitude is taken from x and whose sign is taken from y.If x is a NaN, a NaN with the sign bit of y is returned.
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 3.54 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/.