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.\" manual page may be incorrect or out-of-date.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