mirror of https://github.com/mkerrisk/man-pages
nextup.3: New page documenting nextup(), nextdown(), and related functions
This commit is contained in:
parent
7e318d44a1
commit
c484406d06
|
@ -0,0 +1,93 @@
|
||||||
|
.\" Copyright (C) 2016, Michael Kerrisk <mtk.manpages@gmail.com>
|
||||||
|
.\"
|
||||||
|
.\" %%%LICENSE_START(VERBATIM)
|
||||||
|
.\" Permission is granted to make and distribute verbatim copies of this
|
||||||
|
.\" manual provided the copyright notice and this permission notice are
|
||||||
|
.\" preserved on all copies.
|
||||||
|
.\"
|
||||||
|
.\" Permission is granted to copy and distribute modified versions of this
|
||||||
|
.\" manual under the conditions for verbatim copying, provided that the
|
||||||
|
.\" entire resulting derived work is distributed under the terms of a
|
||||||
|
.\" permission notice identical to this one.
|
||||||
|
.\"
|
||||||
|
.\" Since the Linux kernel and libraries are constantly changing, this
|
||||||
|
.\" manual page may be incorrect or out-of-date. The author(s) assume no
|
||||||
|
.\" responsibility for errors or omissions, or for damages resulting from
|
||||||
|
.\" the use of the information contained herein. The author(s) may not
|
||||||
|
.\" have taken the same level of care in the production of this manual,
|
||||||
|
.\" which is licensed free of charge, as they might when working
|
||||||
|
.\" professionally.
|
||||||
|
.\"
|
||||||
|
.\" Formatted or processed versions of this manual, if unaccompanied by
|
||||||
|
.\" the source, must acknowledge the copyright and authors of this work.
|
||||||
|
.\" %%%LICENSE_END
|
||||||
|
.\"
|
||||||
|
.TH NEXTUP 3 2016-07-15 "GNU" "Linux Programmer's Manual"
|
||||||
|
.SH NAME
|
||||||
|
nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl \-
|
||||||
|
return next floating-point number toward positive/negative infinity
|
||||||
|
.SH SYNOPSIS
|
||||||
|
.nf
|
||||||
|
.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
|
||||||
|
.B #include <math.h>
|
||||||
|
|
||||||
|
.BI "double nextup(double " x );
|
||||||
|
.BI "float nextupf(float " x );
|
||||||
|
.BI "long double nextupl(long double " x );
|
||||||
|
|
||||||
|
.BI "double nextdown(double " x );
|
||||||
|
.BI "float nextdownf(float " x );
|
||||||
|
.BI "long double nextdownl(long double " x );
|
||||||
|
|
||||||
|
Link with \fI\-lm\fP.
|
||||||
|
.SH DESCRIPTION
|
||||||
|
The
|
||||||
|
.BR nextup (),
|
||||||
|
.BR nextupf (),
|
||||||
|
and
|
||||||
|
.BR nextupl ()
|
||||||
|
functions return the next representable floating-point number greater than
|
||||||
|
.IR x .
|
||||||
|
|
||||||
|
If
|
||||||
|
.I x
|
||||||
|
is the smallest representable negative number in the corresponding type,
|
||||||
|
these functions return \-0.
|
||||||
|
If
|
||||||
|
.I x
|
||||||
|
is 0, the returned value is the smallest representable positive number
|
||||||
|
of the corresponding type.
|
||||||
|
|
||||||
|
If
|
||||||
|
.I x
|
||||||
|
is positive infinity, the returned value is positive infinity.
|
||||||
|
If
|
||||||
|
.I x
|
||||||
|
is negative infinity,
|
||||||
|
the returned value is the largest representable finite negative number
|
||||||
|
of the corresponding type.
|
||||||
|
|
||||||
|
If
|
||||||
|
.I x
|
||||||
|
is Nan,
|
||||||
|
the returned value is NaN.
|
||||||
|
|
||||||
|
The value returned by
|
||||||
|
.IR nextdown(x)
|
||||||
|
is
|
||||||
|
.IR \-nextup(\-x) ,
|
||||||
|
and similarly for the other types.
|
||||||
|
.SH RETURN VALUE
|
||||||
|
See DESCRIPTION.
|
||||||
|
.\" .SH ERRORS
|
||||||
|
.\" .SH ATTRIBUTES
|
||||||
|
.SH VERSIONS
|
||||||
|
These functions first appeared in glibc in version 2.24.
|
||||||
|
.SH CONFORMING TO
|
||||||
|
These functions are described in
|
||||||
|
.IR "IEEE Std 754-2008 - Standard for Floating-Point Arithmetic"
|
||||||
|
and
|
||||||
|
.IR "ISO/IEC TS 18661".
|
||||||
|
.SH SEE ALSO
|
||||||
|
.BR nearbyint (3),
|
||||||
|
.BR nextafter (3)
|
Loading…
Reference in New Issue