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 implementations 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 original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .