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diff --git a/man3/nextup.3 b/man3/nextup.3 new file mode 100644 index 0000000000..2555cebc19 --- /dev/null +++ b/man3/nextup.3 @@ -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 +.\" +.\" Since the Linux kernel and libraries are constantly changing, this +.\" manual page may be incorrect or out-of-date.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) |