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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 3.44 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 |