197 lines
4.0 KiB
HTML
197 lines
4.0 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of ABS</TITLE>
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</HEAD><BODY>
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<H1>ABS</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2016-03-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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abs, labs, llabs, imaxabs - compute the absolute value of an integer
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/stdlib.h">stdlib.h</A>></B>
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<B>int abs(int </B><I>j</I><B>);</B>
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<B>long int labs(long int </B><I>j</I><B>);</B>
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<B>long long int llabs(long long int </B><I>j</I><B>);</B>
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<B>#include <<A HREF="file:///usr/include/inttypes.h">inttypes.h</A>></B>
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<B>intmax_t imaxabs(intmax_t </B><I>j</I><B>);</B>
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</PRE>
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<P>
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Feature Test Macro Requirements for glibc (see
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
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<P>
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<B>llabs</B>():
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<DL COMPACT><DT id="1"><DD>
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_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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</DL>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>abs</B>()
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function computes the absolute value of the integer
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argument <I>j</I>.
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The
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<B>labs</B>(),
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<B>llabs</B>()
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and
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<B>imaxabs</B>()
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functions compute the absolute value of the argument <I>j</I> of the
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appropriate integer type for the function.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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Returns the absolute value of the integer argument, of the appropriate
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integer type for the function.
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<A NAME="lbAF"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>abs</B>(),
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<B>labs</B>(),
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<B>llabs</B>(),
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<B>imaxabs</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<A NAME="lbAG"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008, C99, SVr4, 4.3BSD.
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C89 only
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includes the
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<B>abs</B>()
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and
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<B>labs</B>()
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functions; the functions
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<B>llabs</B>()
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and
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<B>imaxabs</B>()
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were added in C99.
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<A NAME="lbAH"> </A>
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<H2>NOTES</H2>
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Trying to take the absolute value of the most negative integer
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is not defined.
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<P>
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The
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<B>llabs</B>()
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function is included in glibc since version 2.0.
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The
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<B>imaxabs</B>()
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function is included in
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glibc since version 2.1.1.
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<P>
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For
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<B>llabs</B>()
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to be declared, it may be necessary to define
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<B>_ISOC99_SOURCE</B> or <B>_ISOC9X_SOURCE</B> (depending on the
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version of glibc) before including any standard headers.
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<P>
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By default,
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GCC handles
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<B>abs</B>(),
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<B>labs</B>(),
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and (since GCC 3.0)
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<B>llabs</B>()
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and
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<B>imaxabs</B>()
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as built-in functions.
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<A NAME="lbAI"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+cabs">cabs</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+ceil">ceil</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+fabs">fabs</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+floor">floor</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+rint">rint</A></B>(3)
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<A NAME="lbAJ"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="2"><A HREF="#lbAB">NAME</A><DD>
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<DT id="3"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="4"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="5"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="6"><A HREF="#lbAF">ATTRIBUTES</A><DD>
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<DT id="7"><A HREF="#lbAG">CONFORMING TO</A><DD>
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<DT id="8"><A HREF="#lbAH">NOTES</A><DD>
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<DT id="9"><A HREF="#lbAI">SEE ALSO</A><DD>
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<DT id="10"><A HREF="#lbAJ">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:35 GMT, March 31, 2021
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