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copysignf(3) [opendarwin man page]

COPYSIGN(3)						   BSD Library Functions Manual 					       COPYSIGN(3)

NAME
copysign -- changes the sign of x to that of y SYNOPSIS
#include <math.h> double copysign(double x, double y); float copysignf(float x, float y); DESCRIPTION
The copysign() and copysignf() functions return x with its sign changed to y's. SPECIAL VALUES
copysign(x, y) returns a NaN (with y's sign) if x is a NaN. STANDARDS
The copysign() and copysignf() functions conform to ISO/IEC 9899:1999(E). BSD
July 2, 2003 BSD

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COPYSIGN(3)						     Linux Programmer's Manual						       COPYSIGN(3)

NAME
copysign, copysignf, copysignl - copy sign of a number SYNOPSIS
#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 posi- tive. 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/. GNU
2012-03-25 COPYSIGN(3)
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