174 lines
3.5 KiB
HTML
174 lines
3.5 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 ATOI</TITLE>
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</HEAD><BODY>
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<H1>ATOI</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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atoi, atol, atoll - convert a string to 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 atoi(const char *</B><I>nptr</I><B>);</B>
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<B>long atol(const char *</B><I>nptr</I><B>);</B>
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<B>long long atoll(const char *</B><I>nptr</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>atoll</B>():
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<DL COMPACT><DT id="1"><DD>
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_ISOC99_SOURCE ||
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<BR> || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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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>atoi</B>()
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function converts the initial portion of the string
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pointed to by <I>nptr</I> to
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<I>int</I>.
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The behavior is the same as
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<P>
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strtol(nptr, NULL, 10);
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<P>
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except that
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<B>atoi</B>()
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does not detect errors.
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<P>
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The
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<B>atol</B>()
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and
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<B>atoll</B>()
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functions behave the same as
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<B>atoi</B>(),
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except that they convert the initial portion of the
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string to their return type of <I>long</I> or <I>long long</I>.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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The converted value.
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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>atoi</B>(),
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<B>atol</B>(),
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<B>atoll</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe locale<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 and
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POSIX.1-1996 include the functions
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<B>atoi</B>()
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and
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<B>atol</B>()
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only.
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<A NAME="lbAH"> </A>
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<H2>NOTES</H2>
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Linux libc provided
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<B>atoq</B>()
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as an obsolete name for
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<B>atoll</B>();
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<B>atoq</B>()
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is not provided by glibc.
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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+atof">atof</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+strtod">strtod</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+strtol">strtol</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+strtoul">strtoul</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: 00:05:36 GMT, March 31, 2021
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</BODY>
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</HTML>
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