Name
nextafter, nextafterf, nextafterl, nexttoward,
nexttowardf, nexttowardl — floating point number
manipulation
Synopsis
#include <math.h>
double nextafter( |
double |
x, |
|
double |
y) ; |
float
nextafterf( |
float |
x, |
|
float |
y) ; |
long
double nextafterl( |
long double |
x, |
|
long double |
y) ; |
double nexttoward( |
double |
x, |
|
long double |
y) ; |
float
nexttowardf( |
float |
x, |
|
long double |
y) ; |
long
double nexttowardl( |
long double |
x, |
|
long double |
y) ; |
![[Note]](../stylesheet/note.png) |
Note |
Link with −lm .
|
DESCRIPTION
The nextafter
() functions
return the next representable neighbor of x
in the direction towards
y
. The size of the
step between x
and
the result depends on the type of the result. If x
= y
the function simply returns
y
. If either value is
NaN
, then
NaN
is returned.
Otherwise a value corresponding to the value of the least
significant bit in the mantissa is added or subtracted,
depending on the direction.
The nexttoward
() functions
do the same as the nextafter
()
functions, except that they have a long double second
argument.
These functions will signal overflow or underflow if the
result goes outside of the range of normalized numbers.
CONFORMING TO
C99. This function is defined in IEC 559 (and the appendix
with recommended functions in IEEE 754/IEEE 854).
SEE ALSO
nearbyint(3)
Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
Distributed under GPL
Based on glibc infopages
|