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

.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
.\"     <mtk.manpages@gmail.com>
.\"
.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
.\" Distributed under GPL
.\" %%%LICENSE_END
.\"
.\" Based on glibc infopages
.\"
.TH NEXTAFTER 3 2017-09-15 "GNU" "Linux Programmer's Manual"
.SH NAME
nextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl \-
floating-point number manipulation
.SH SYNOPSIS
.B #include <math.h>
.PP
.BI "double nextafter(double " x ", double " y );
.br
.BI "float nextafterf(float " x ", float " y );
.br
.BI "long double nextafterl(long double " x ", long double " y );
.PP
.BI "double nexttoward(double " x ", long double " y );
.br
.BI "float nexttowardf(float " x ", long double " y );
.br
.BI "long double nexttowardl(long double " x ", long double " y );
.PP
Link with \fI\-lm\fP.
.PP
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
.PP
.ad l
.BR nextafter ():
.RS 4
_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
    || _XOPEN_SOURCE\ >=\ 500
.\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
    || /* Since glibc 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
.RE
.br
.BR nextafterf (),
.BR nextafterl ():
.RS 4
_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
    || /* Since glibc 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
.RE
.br
.BR nexttoward (),
.BR nexttowardf (),
.BR nexttowardl ():
.RS 4
_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE\ >=\ 200112L
.RE
.ad b
.SH DESCRIPTION
The
.BR nextafter (),
.BR nextafterf (),
and
.BR nextafterl ()
functions return the next representable floating-point value following
.I x
in the direction of
.IR y .
If
.I y
is less than
.IR x ,