|
Packit |
7cfc04 |
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
|
|
Packit |
7cfc04 |
.\"
|
|
Packit |
7cfc04 |
.\" %%%LICENSE_START(VERBATIM)
|
|
Packit |
7cfc04 |
.\" Permission is granted to make and distribute verbatim copies of this
|
|
Packit |
7cfc04 |
.\" manual provided the copyright notice and this permission notice are
|
|
Packit |
7cfc04 |
.\" preserved on all copies.
|
|
Packit |
7cfc04 |
.\"
|
|
Packit |
7cfc04 |
.\" Permission is granted to copy and distribute modified versions of this
|
|
Packit |
7cfc04 |
.\" manual under the conditions for verbatim copying, provided that the
|
|
Packit |
7cfc04 |
.\" entire resulting derived work is distributed under the terms of a
|
|
Packit |
7cfc04 |
.\" permission notice identical to this one.
|
|
Packit |
7cfc04 |
.\"
|
|
Packit |
7cfc04 |
.\" Since the Linux kernel and libraries are constantly changing, this
|
|
Packit |
7cfc04 |
.\" manual page may be incorrect or out-of-date. The author(s) assume no
|
|
Packit |
7cfc04 |
.\" responsibility for errors or omissions, or for damages resulting from
|
|
Packit |
7cfc04 |
.\" the use of the information contained herein. The author(s) may not
|
|
Packit |
7cfc04 |
.\" have taken the same level of care in the production of this manual,
|
|
Packit |
7cfc04 |
.\" which is licensed free of charge, as they might when working
|
|
Packit |
7cfc04 |
.\" professionally.
|
|
Packit |
7cfc04 |
.\"
|
|
Packit |
7cfc04 |
.\" Formatted or processed versions of this manual, if unaccompanied by
|
|
Packit |
7cfc04 |
.\" the source, must acknowledge the copyright and authors of this work.
|
|
Packit |
7cfc04 |
.\" %%%LICENSE_END
|
|
Packit |
7cfc04 |
.\"
|
|
Packit |
7cfc04 |
.\" References consulted:
|
|
Packit |
7cfc04 |
.\" Linux libc source code
|
|
Packit |
7cfc04 |
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
|
|
Packit |
7cfc04 |
.\" 386BSD man pages
|
|
Packit |
7cfc04 |
.\" Modified Sat Jul 24 19:42:04 1993 by Rik Faith (faith@cs.unc.edu)
|
|
Packit |
7cfc04 |
.\" Added fabsl, fabsf, aeb, 2001-06-07
|
|
Packit |
7cfc04 |
.\"
|
|
Packit |
7cfc04 |
.TH FABS 3 2017-09-15 "" "Linux Programmer's Manual"
|
|
Packit |
7cfc04 |
.SH NAME
|
|
Packit |
7cfc04 |
fabs, fabsf, fabsl \- absolute value of floating-point number
|
|
Packit |
7cfc04 |
.SH SYNOPSIS
|
|
Packit |
7cfc04 |
.nf
|
|
Packit |
7cfc04 |
.B #include <math.h>
|
|
Packit |
7cfc04 |
.PP
|
|
Packit |
7cfc04 |
.BI "double fabs(double " x );
|
|
Packit |
7cfc04 |
.BI "float fabsf(float " x );
|
|
Packit |
7cfc04 |
.BI "long double fabsl(long double " x );
|
|
Packit |
7cfc04 |
.fi
|
|
Packit |
7cfc04 |
.PP
|
|
Packit |
7cfc04 |
Link with \fI\-lm\fP.
|
|
Packit |
7cfc04 |
.PP
|
|
Packit |
7cfc04 |
.in -4n
|
|
Packit |
7cfc04 |
Feature Test Macro Requirements for glibc (see
|
|
Packit |
7cfc04 |
.BR feature_test_macros (7)):
|
|
Packit |
7cfc04 |
.in
|
|
Packit |
7cfc04 |
.PP
|
|
Packit |
7cfc04 |
.ad l
|
|
Packit |
7cfc04 |
.BR fabsf (),
|
|
Packit |
7cfc04 |
.BR fabsl ():
|
|
Packit |
7cfc04 |
.RS 4
|
|
Packit |
7cfc04 |
_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
|
|
Packit |
7cfc04 |
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|
|
Packit |
7cfc04 |
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
|
|
Packit |
7cfc04 |
.RE
|
|
Packit |
7cfc04 |
.ad b
|
|
Packit |
7cfc04 |
.SH DESCRIPTION
|
|
Packit |
7cfc04 |
These functions return the absolute value of the floating-point
|
|
Packit |
7cfc04 |
number
|
|
Packit |
7cfc04 |
.IR x .
|
|
Packit |
7cfc04 |
.SH RETURN VALUE
|
|
Packit |
7cfc04 |
These functions return the absolute value of
|
|
Packit |
7cfc04 |
.IR x .
|
|
Packit |
7cfc04 |
.PP
|
|
Packit |
7cfc04 |
If
|
|
Packit |
7cfc04 |
.I x
|
|
Packit |
7cfc04 |
is a NaN, a NaN is returned.
|
|
Packit |
7cfc04 |
.PP
|
|
Packit |
7cfc04 |
If
|
|
Packit |
7cfc04 |
.I x
|
|
Packit |
7cfc04 |
is \-0, +0 is returned.
|
|
Packit |
7cfc04 |
.PP
|
|
Packit |
7cfc04 |
If
|
|
Packit |
7cfc04 |
.I x
|
|
Packit |
7cfc04 |
is negative infinity or positive infinity, positive infinity is returned.
|
|
Packit |
7cfc04 |
.SH ERRORS
|
|
Packit |
7cfc04 |
No errors occur.
|
|
Packit |
7cfc04 |
.SH ATTRIBUTES
|
|
Packit |
7cfc04 |
For an explanation of the terms used in this section, see
|
|
Packit |
7cfc04 |
.BR attributes (7).
|
|
Packit |
7cfc04 |
.TS
|
|
Packit |
7cfc04 |
allbox;
|
|
Packit |
7cfc04 |
lbw24 lb lb
|
|
Packit |
7cfc04 |
l l l.
|
|
Packit |
7cfc04 |
Interface Attribute Value
|
|
Packit |
7cfc04 |
T{
|
|
Packit |
7cfc04 |
.BR fabs (),
|
|
Packit |
7cfc04 |
.BR fabsf (),
|
|
Packit |
7cfc04 |
.BR fabsl ()
|
|
Packit |
7cfc04 |
T} Thread safety MT-Safe
|
|
Packit |
7cfc04 |
.TE
|
|
Packit |
7cfc04 |
.SH CONFORMING TO
|
|
Packit |
7cfc04 |
C99, POSIX.1-2001, POSIX.1-2008.
|
|
Packit |
7cfc04 |
.PP
|
|
Packit |
7cfc04 |
The variant returning
|
|
Packit |
7cfc04 |
.I double
|
|
Packit |
7cfc04 |
also conforms to
|
|
Packit |
7cfc04 |
SVr4, 4.3BSD, C89.
|
|
Packit |
7cfc04 |
.SH SEE ALSO
|
|
Packit |
7cfc04 |
.BR abs (3),
|
|
Packit |
7cfc04 |
.BR cabs (3),
|
|
Packit |
7cfc04 |
.BR ceil (3),
|
|
Packit |
7cfc04 |
.BR floor (3),
|
|
Packit |
7cfc04 |
.BR labs (3),
|
|
Packit |
7cfc04 |
.BR rint (3)
|
|
Packit |
7cfc04 |
.SH COLOPHON
|
|
Packit |
7cfc04 |
This page is part of release 4.15 of the Linux
|
|
Packit |
7cfc04 |
.I man-pages
|
|
Packit |
7cfc04 |
project.
|
|
Packit |
7cfc04 |
A description of the project,
|
|
Packit |
7cfc04 |
information about reporting bugs,
|
|
Packit |
7cfc04 |
and the latest version of this page,
|
|
Packit |
7cfc04 |
can be found at
|
|
Packit |
7cfc04 |
\%https://www.kernel.org/doc/man\-pages/.
|