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IEEE(3) OpenBSD Programmer's Manual IEEE(3)
NAME
copysign, copysignf, finite, finitef, ilogb, ilogbf, nextafter,
nextafterf, remainder, remainderf, scalbn, scalbnf  Functions for IEEE
arithmetic
SYNOPSIS
#include <math.h>
double
copysign(double x, double y);
float
copysignf(float x, float y);
int
finite(double x);
int
finitef(float x);
int
ilogb(double x);
int
ilogbf(float x);
double
nextafter(double x, double y);
float
nextafterf(float x, float y);
double
remainder(double x, double y);
float
remainderf(float x, float y);
double
scalbn(double x, int n);
float
scalbnf(float x, int n);
DESCRIPTION
These functions are required or recommended by IEEE Std7541985.
copysign() returns x with its sign changed to y's.
finite() returns the value 1 just when infinity < x < +infinity; other
wise a zero is returned (when x = infinity or x is NaN
ilogb() returns x's exponent n, in integer format. ilogb(+infinity) re
turns INT_MAX and ilogb(0) returns INT_MIN.
nextafter() returns the next machine representable number from x in di
rection y.
remainder() returns the remainder r := x  n*y where n is the integer
nearest the exact value of x/y; moreover if n  x/y = 1/2 then n is
even. Consequently the remainder is computed exactly and r <= y/2.
But remainder(x, 0) and remainder(infinity, 0) are invalid operations
that produce a NaN.
scalbn() returns x*(2**n) computed by exponent manipulation.
SEE ALSO
math(3)
HISTORY
The ieee functions appeared in 4.3BSD.
STANDARDS
IEEE Std7541985
OpenBSD 2.6 February 25, 1994 2
Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts Institute of Technology, Free Software Foundation, FreeBSD Inc., and others. 
(Corrections, notes, and links courtesy of RocketAware.com)
FreeBSD Sources for ieee(3) functions FreeBSD Sources for ieee(3) functions OpenBSD sources for ieee(3)
Up to: Floating point math  Floating point math (including complex numbers)
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