238 lines
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238 lines
5.0 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 FINITE</TITLE>
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</HEAD><BODY>
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<H1>FINITE</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<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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finite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl -
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BSD floating-point classification functions
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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/math.h">math.h</A>></B>
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<B>int finite(double </B><I>x</I><B>);</B>
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<B>int finitef(float </B><I>x</I><B>);</B>
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<B>int finitel(long double </B><I>x</I><B>);</B>
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<B>int isinf(double </B><I>x</I><B>);</B>
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<B>int isinff(float </B><I>x</I><B>);</B>
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<B>int isinfl(long double </B><I>x</I><B>);</B>
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<B>int isnan(double </B><I>x</I><B>);</B>
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<B>int isnanf(float </B><I>x</I><B>);</B>
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<B>int isnanl(long double </B><I>x</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>finite</B>(),
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<B>finitef</B>(),
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<B>finitel</B>():
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<DL COMPACT><DT id="1"><DD>
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/* Glibc since 2.19: */ _DEFAULT_SOURCE
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<BR> || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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</DL>
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<B>isinf</B>():
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<DL COMPACT><DT id="2"><DD>
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_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE
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<BR> || /* Glibc since 2.19: */ _DEFAULT_SOURCE
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<BR> || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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</DL>
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<BR>
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<B>isinff</B>(),
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<B>isinfl</B>():
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<DL COMPACT><DT id="3"><DD>
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/* Glibc since 2.19: */ _DEFAULT_SOURCE
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<BR> || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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</DL>
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<B>isnan</B>():
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<DL COMPACT><DT id="4"><DD>
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_XOPEN_SOURCE || _ISOC99_SOURCE
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<BR> || /* Glibc since 2.19: */ _DEFAULT_SOURCE
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<BR> || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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</DL>
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<B>isnanf</B>(),
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<B>isnanl</B>():
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<DL COMPACT><DT id="5"><DD>
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_XOPEN_SOURCE >= 600
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<BR> || /* Glibc since 2.19: */ _DEFAULT_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>finite</B>(),
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<B>finitef</B>(),
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and
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<B>finitel</B>()
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functions return a nonzero value if
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<I>x</I>
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is neither infinite
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nor a "not-a-number" (NaN) value, and 0 otherwise.
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<P>
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The
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<B>isnan</B>(),
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<B>isnanf</B>(),
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and
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<B>isnanl</B>()
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functions return a nonzero value if
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<I>x</I>
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is a NaN value,
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and 0 otherwise.
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<P>
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The
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<B>isinf</B>(),
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<B>isinff</B>(),
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and
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<B>isinfl</B>()
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functions return 1 if
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<I>x</I>
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is positive infinity, -1 if
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<I>x</I>
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is negative infinity, and 0 otherwise.
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<A NAME="lbAE"> </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>finite</B>(),
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<B>finitef</B>(),
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<B>finitel</B>(),
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<BR>
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<B>isinf</B>(),
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<B>isinff</B>(),
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<B>isinfl</B>(),
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<BR>
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<B>isnan</B>(),
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<B>isnanf</B>(),
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<B>isnanl</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="lbAF"> </A>
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<H2>NOTES</H2>
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Note that these functions are obsolete.
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C99 defines macros
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<B>isfinite</B>(),
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<B>isinf</B>(),
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and
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<B>isnan</B>()
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(for all types) replacing them.
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Further note that the C99
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<B>isinf</B>()
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has weaker guarantees on the return value.
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See
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<B><A HREF="/cgi-bin/man/man2html?3+fpclassify">fpclassify</A></B>(3).
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+fpclassify">fpclassify</A></B>(3)
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<A NAME="lbAH"> </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="6"><A HREF="#lbAB">NAME</A><DD>
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<DT id="7"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="8"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="9"><A HREF="#lbAE">ATTRIBUTES</A><DD>
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<DT id="10"><A HREF="#lbAF">NOTES</A><DD>
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<DT id="11"><A HREF="#lbAG">SEE ALSO</A><DD>
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<DT id="12"><A HREF="#lbAH">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: 00:05:43 GMT, March 31, 2021
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</BODY>
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</HTML>
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