02-04-2011
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LEARN ABOUT LINUX
nextdownl
NEXTUP(3) Linux Programmer's Manual NEXTUP(3)
NAME
nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl - return next floating-point number toward positive/negative infinity
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <math.h>
double nextup(double x);
float nextupf(float x);
long double nextupl(long double x);
double nextdown(double x);
float nextdownf(float x);
long double nextdownl(long double x);
Link with -lm.
DESCRIPTION
The nextup(), nextupf(), and nextupl() functions return the next representable floating-point number greater than x.
If x is the smallest representable negative number in the corresponding type, these functions return -0. If x is 0, the returned value is
the smallest representable positive number of the corresponding type.
If x is positive infinity, the returned value is positive infinity. If x is negative infinity, the returned value is the largest repre-
sentable finite negative number of the corresponding type.
If x is Nan, the returned value is NaN.
The value returned by nextdown(x) is -nextup(-x), and similarly for the other types.
RETURN VALUE
See DESCRIPTION.
VERSIONS
These functions first appeared in glibc in version 2.24.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+-------------------------------------+---------------+---------+
|Interface | Attribute | Value |
+-------------------------------------+---------------+---------+
|nextup(), nextupf(), nextupl(), | Thread safety | MT-Safe |
|nextdown(), nextdownf(), nextdownl() | | |
+-------------------------------------+---------------+---------+
CONFORMING TO
These functions are described in IEEE Std 754-2008 - Standard for Floating-Point Arithmetic and ISO/IEC TS 18661.
SEE ALSO
nearbyint(3), nextafter(3)
GNU
2017-09-15 NEXTUP(3)