Linux 2.6 - man page for copysign (linux section 3posix)
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COPYSIGN(P) POSIX Programmer's Manual COPYSIGN(P)
copysign, copysignf, copysignl - number manipulation function
double copysign(double x, double y);
float copysignf(float x, float y);
long double copysignl(long double x, long double y);
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.
Upon successful completion, these functions shall return a value with the magnitude of x
and the sign of y.
No errors are defined.
The following sections are informative.
signbit() , the Base Definitions volume of IEEE Std 1003.1-2001, <math.h>
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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