302 lines
5.7 KiB
HTML
302 lines
5.7 KiB
HTML
|
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
|
<HTML><HEAD><TITLE>Man page of SCALBLN</TITLE>
|
|
</HEAD><BODY>
|
|
<H1>SCALBLN</H1>
|
|
Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
|
|
<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
|
|
|
|
<A NAME="lbAB"> </A>
|
|
<H2>NAME</H2>
|
|
|
|
scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl -
|
|
multiply floating-point number by integral power of radix
|
|
<A NAME="lbAC"> </A>
|
|
<H2>SYNOPSIS</H2>
|
|
|
|
<B>#include <<A HREF="file:///usr/include/math.h">math.h</A>></B>
|
|
|
|
<P>
|
|
|
|
<B>double scalbln(double </B><I>x</I><B>, long int </B><I>exp</I><B>);</B>
|
|
|
|
<BR>
|
|
|
|
<B>float scalblnf(float </B><I>x</I><B>, long int </B><I>exp</I><B>);</B>
|
|
|
|
<BR>
|
|
|
|
<B>long double scalblnl(long double </B><I>x</I><B>, long int </B><I>exp</I><B>);</B>
|
|
|
|
<P>
|
|
|
|
<B>double scalbn(double </B><I>x</I><B>, int </B><I>exp</I><B>);</B>
|
|
|
|
<BR>
|
|
|
|
<B>float scalbnf(float </B><I>x</I><B>, int </B><I>exp</I><B>);</B>
|
|
|
|
<BR>
|
|
|
|
<B>long double scalbnl(long double </B><I>x</I><B>, int </B><I>exp</I><B>);</B>
|
|
|
|
<P>
|
|
|
|
Link with <I>-lm</I>.
|
|
<P>
|
|
|
|
|
|
Feature Test Macro Requirements for glibc (see
|
|
<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
|
|
|
|
|
|
<P>
|
|
|
|
|
|
<B>scalbln</B>(),
|
|
|
|
<B>scalblnf</B>(),
|
|
|
|
<B>scalblnl</B>():
|
|
|
|
<DL COMPACT><DT id="1"><DD>
|
|
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|
|
<BR> || /* Since glibc 2.19: */ _DEFAULT_SOURCE
|
|
</DL>
|
|
|
|
<BR>
|
|
|
|
<B>scalbn</B>(),
|
|
|
|
<B>scalbnf</B>(),
|
|
|
|
<B>scalbnl</B>():
|
|
|
|
<DL COMPACT><DT id="2"><DD>
|
|
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|
|
<BR> || /* Since glibc 2.19: */ _DEFAULT_SOURCE
|
|
<BR> || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
|
|
</DL>
|
|
|
|
|
|
<A NAME="lbAD"> </A>
|
|
<H2>DESCRIPTION</H2>
|
|
|
|
These functions multiply their first argument
|
|
<I>x</I>
|
|
|
|
by
|
|
<B>FLT_RADIX</B>
|
|
|
|
(probably 2)
|
|
to the power of
|
|
<I>exp</I>,
|
|
|
|
that is:
|
|
<P>
|
|
|
|
<PRE>
|
|
x * FLT_RADIX ** exp
|
|
</PRE>
|
|
|
|
<P>
|
|
|
|
The definition of
|
|
<B>FLT_RADIX</B>
|
|
|
|
can be obtained by including
|
|
<I><<A HREF="file:///usr/include/float.h">float.h</A>></I>.
|
|
|
|
|
|
<A NAME="lbAE"> </A>
|
|
<H2>RETURN VALUE</H2>
|
|
|
|
On success, these functions return
|
|
<I>x</I>
|
|
|
|
*
|
|
<B>FLT_RADIX</B>
|
|
|
|
**
|
|
<I>exp</I>.
|
|
|
|
<P>
|
|
|
|
If
|
|
<I>x</I>
|
|
|
|
is a NaN, a NaN is returned.
|
|
<P>
|
|
|
|
If
|
|
<I>x</I>
|
|
|
|
is positive infinity (negative infinity),
|
|
positive infinity (negative infinity) is returned.
|
|
<P>
|
|
|
|
If
|
|
<I>x</I>
|
|
|
|
is +0 (-0), +0 (-0) is returned.
|
|
<P>
|
|
|
|
If the result overflows,
|
|
a range error occurs,
|
|
and the functions return
|
|
<B>HUGE_VAL</B>,
|
|
|
|
<B>HUGE_VALF</B>,
|
|
|
|
or
|
|
<B>HUGE_VALL</B>,
|
|
|
|
respectively, with a sign the same as
|
|
<I>x</I>.
|
|
|
|
<P>
|
|
|
|
If the result underflows,
|
|
a range error occurs,
|
|
and the functions return zero, with a sign the same as
|
|
<I>x</I>.
|
|
|
|
<A NAME="lbAF"> </A>
|
|
<H2>ERRORS</H2>
|
|
|
|
See
|
|
<B><A HREF="/cgi-bin/man/man2html?7+math_error">math_error</A></B>(7)
|
|
|
|
for information on how to determine whether an error has occurred
|
|
when calling these functions.
|
|
<P>
|
|
|
|
The following errors can occur:
|
|
<DL COMPACT>
|
|
<DT id="3">Range error, overflow<DD>
|
|
|
|
|
|
|
|
An overflow floating-point exception
|
|
(<B>FE_OVERFLOW</B>)
|
|
|
|
is raised.
|
|
<DT id="4">Range error, underflow<DD>
|
|
|
|
|
|
|
|
An underflow floating-point exception
|
|
(<B>FE_UNDERFLOW</B>)
|
|
|
|
is raised.
|
|
</DL>
|
|
<P>
|
|
|
|
These functions do not set
|
|
<I>errno</I>.
|
|
|
|
|
|
|
|
<A NAME="lbAG"> </A>
|
|
<H2>VERSIONS</H2>
|
|
|
|
These functions first appeared in glibc in version 2.1.
|
|
<A NAME="lbAH"> </A>
|
|
<H2>ATTRIBUTES</H2>
|
|
|
|
For an explanation of the terms used in this section, see
|
|
<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
|
|
|
|
<TABLE BORDER>
|
|
<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
|
|
<TR VALIGN=top><TD>
|
|
<B>scalbn</B>(),
|
|
|
|
<B>scalbnf</B>(),
|
|
|
|
<B>scalbnl</B>(),
|
|
|
|
<BR>
|
|
|
|
<B>scalbln</B>(),
|
|
|
|
<B>scalblnf</B>(),
|
|
|
|
<B>scalblnl</B>()
|
|
|
|
</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
|
|
</TABLE>
|
|
|
|
<A NAME="lbAI"> </A>
|
|
<H2>CONFORMING TO</H2>
|
|
|
|
C99, POSIX.1-2001, POSIX.1-2008.
|
|
<A NAME="lbAJ"> </A>
|
|
<H2>NOTES</H2>
|
|
|
|
These functions differ from the obsolete functions described in
|
|
<B><A HREF="/cgi-bin/man/man2html?3+scalb">scalb</A></B>(3)
|
|
|
|
in the type of their second argument.
|
|
The functions described on this page have a second argument
|
|
of an integral type, while those in
|
|
<B><A HREF="/cgi-bin/man/man2html?3+scalb">scalb</A></B>(3)
|
|
|
|
have a second argument of type
|
|
<I>double</I>.
|
|
|
|
<P>
|
|
|
|
If
|
|
<B>FLT_RADIX</B>
|
|
|
|
equals 2 (which is usual), then
|
|
<B>scalbn</B>()
|
|
|
|
is equivalent to
|
|
<B><A HREF="/cgi-bin/man/man2html?3+ldexp">ldexp</A></B>(3).
|
|
|
|
<A NAME="lbAK"> </A>
|
|
<H2>SEE ALSO</H2>
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?3+ldexp">ldexp</A></B>(3),
|
|
|
|
<B><A HREF="/cgi-bin/man/man2html?3+scalb">scalb</A></B>(3)
|
|
|
|
<A NAME="lbAL"> </A>
|
|
<H2>COLOPHON</H2>
|
|
|
|
This page is part of release 5.05 of the Linux
|
|
<I>man-pages</I>
|
|
|
|
project.
|
|
A description of the project,
|
|
information about reporting bugs,
|
|
and the latest version of this page,
|
|
can be found at
|
|
<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
|
|
<P>
|
|
|
|
<HR>
|
|
<A NAME="index"> </A><H2>Index</H2>
|
|
<DL>
|
|
<DT id="5"><A HREF="#lbAB">NAME</A><DD>
|
|
<DT id="6"><A HREF="#lbAC">SYNOPSIS</A><DD>
|
|
<DT id="7"><A HREF="#lbAD">DESCRIPTION</A><DD>
|
|
<DT id="8"><A HREF="#lbAE">RETURN VALUE</A><DD>
|
|
<DT id="9"><A HREF="#lbAF">ERRORS</A><DD>
|
|
<DT id="10"><A HREF="#lbAG">VERSIONS</A><DD>
|
|
<DT id="11"><A HREF="#lbAH">ATTRIBUTES</A><DD>
|
|
<DT id="12"><A HREF="#lbAI">CONFORMING TO</A><DD>
|
|
<DT id="13"><A HREF="#lbAJ">NOTES</A><DD>
|
|
<DT id="14"><A HREF="#lbAK">SEE ALSO</A><DD>
|
|
<DT id="15"><A HREF="#lbAL">COLOPHON</A><DD>
|
|
</DL>
|
|
<HR>
|
|
This document was created by
|
|
<A HREF="/cgi-bin/man/man2html">man2html</A>,
|
|
using the manual pages.<BR>
|
|
Time: 00:05:54 GMT, March 31, 2021
|
|
</BODY>
|
|
</HTML>
|