This manual page is part of the POSIX Programmers Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
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 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.
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 original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
|IEEE/The Open Group||COPYSIGN (P)||2003|