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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(), copysignf(), and copysignl() 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.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The copysign(), copysignf(), and copysignl() functions are thread-safe.

CONFORMING TO
       C99, POSIX.1-2001.  This function is defined in IEC 559 (and the appen‐
       dix with recommended functions in IEEE 754/IEEE 854).

NOTES
       On architectures where the floating-point formats are not IEEE 754 com‐
       pliant, these functions may treat a negative zero as positive.

SEE ALSO
       signbit(3)

COLOPHON
       This page is part of release 3.58 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				  2013-10-14			   COPYSIGN(3)
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