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Linux 2.6 - man page for copysign (linux section 3posix)

COPYSIGN(P)			    POSIX Programmer's Manual			      COPYSIGN(P)

NAME
       copysign, copysignf, copysignl - number manipulation function

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);

DESCRIPTION
       These functions shall produce a value with the magnitude of x and the sign of y. On imple-
       mentations that represent a signed zero but do not treat  negative  zero  consistently  in
       arithmetic operations, these functions regard the sign of zero as positive.

RETURN VALUE
       Upon  successful  completion, these functions shall return a value with the magnitude of x
       and the sign of y.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       signbit() , the Base Definitions volume of IEEE Std 1003.1-2001, <math.h>

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				      COPYSIGN(P)


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