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[thirdparty/man-pages.git] / man3 / nextup.3

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-'\" t
-.\" Copyright (C) 2016, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH nextup 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl \-
-return next floating-point number toward positive/negative infinity
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.BR "#define _GNU_SOURCE" "     /* See feature_test_macros(7) */"
-.B #include <math.h>
-.P
-.BI "double nextup(double " x );
-.BI "float nextupf(float " x );
-.BI "long double nextupl(long double " x );
-.P
-.BI "double nextdown(double " x );
-.BI "float nextdownf(float " x );
-.BI "long double nextdownl(long double " x );
-.fi
-.SH DESCRIPTION
-The
-.BR nextup (),
-.BR nextupf (),
-and
-.BR nextupl ()
-functions return the next representable floating-point number greater than
-.IR x .
-.P
-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.
-.P
-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.
-.P
-If
-.I x
-is Nan,
-the returned value is NaN.
-.P
-The value returned by
-.I nextdown(x)
-is
-.IR \-nextup(\-x) ,
-and similarly for the other types.
-.SH RETURN VALUE
-See DESCRIPTION.
-.\" .SH ERRORS
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface      Attribute       Value
-T{
-.na
-.nh
-.BR nextup (),
-.BR nextupf (),
-.BR nextupl (),
-.BR nextdown (),
-.BR nextdownf (),
-.BR nextdownl ()
-T}     Thread safety   MT-Safe
-.TE
-.SH STANDARDS
-These functions are described in
-.I IEEE Std 754-2008 - Standard for Floating-Point Arithmetic
-and
-.IR "ISO/IEC TS 18661".
-.SH HISTORY
-glibc 2.24.
-.SH SEE ALSO
-.BR nearbyint (3),
-.BR nextafter (3)