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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | VERSIONS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
NEXTUP(3) Linux Programmer's Manual NEXTUP(3)
nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl - return
next floating-point number toward positive/negative infinity
#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.
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
representable 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.
See DESCRIPTION.
These functions first appeared in glibc in version 2.24.
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() │ │ │
└─────────────────────────────────────┴───────────────┴─────────┘
These functions are described in IEEE Std 754-2008 - Standard for
Floating-Point Arithmetic and ISO/IEC TS 18661.
nearbyint(3), nextafter(3)
This page is part of release 5.08 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2017-09-15 NEXTUP(3)
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