HP-UX Reference (11i v1 00/12) - 3 Library Functions A-M (vol 6)
__________________________________________________________________________________________________________________________________________________________________________________________________
__________________________________________________________________________________________________________________________________________________________________________________________________
STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man3/!!!intro.3c
________________________________________________________________
___ ___
c
copysign(3M) copysign(3M)
NAME
copysign(), copysignf() - copysign functions
SYNOPSIS
#include <math.h>
double copysign(double x, double y);
float copysignf(float x, float y);
DESCRIPTION
The copysign() function returns x with its sign changed to the sign of y.
The copysign() function is recommended by the IEEE-754 standard for floating-point arithmetic. The
ISO/ANSI C committee has approved the copysign() function for inclusion in the C9X draft standard.
copysignf() is a float version of copysign(); it takes float arguments and returns a float
result.
copysignf() is not specified by any standard, but it is named in accordance with the conventions
specified in the "Future Library Directions" section of the ANSI C standard.
To use these functions, compile either with the default
-Ae option or with the -Aa and
-D_HPUX_SOURCE options. Make sure your program includes <
math.h>. Link in the math library by
specifying
-lm on the compiler or linker command line.
RETURN VALUE
The copysign() function returns a value with the magnitude of x and the sign of y.
ERRORS
No errors are defined.
SEE ALSO
fpclassify(3M), remainder(3M), scalb(3M), scalbn(3M), signbit(3M),math(5).
HP-UX Release 11i: December 2000 − 1 − Section 3−−83
___
___