+++ /dev/null
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date. The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein. The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.\" References consulted:
-.\" Linux libc source code
-.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\" 386BSD man pages
-.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
-.\" Modified 2004-10-31 by aeb
-.\"
-.TH LDEXP 3 2013-08-19 "" "Linux Programmer's Manual"
-.SH NAME
-ldexp, ldexpf, ldexpl \- multiply floating-point number by integral power of 2
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.sp
-.BI "double ldexp(double " x ", int " exp );
-.br
-.BI "float ldexpf(float " x ", int " exp );
-.br
-.BI "long double ldexpl(long double " x ", int " exp );
-.fi
-.sp
-Link with \fI\-lm\fP.
-.sp
-.in -4n
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.in
-.sp
-.ad l
-.BR ldexpf (),
-.BR ldexpl ():
-.RS 4
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
-_POSIX_C_SOURCE\ >=\ 200112L;
-.br
-or
-.I cc\ -std=c99
-.RE
-.ad
-.SH DESCRIPTION
-The
-.BR ldexp ()
-function returns the result of multiplying the floating-point number
-.I x
-by 2 raised to the power
-.IR exp .
-.SH RETURN VALUE
-On success, these functions return
-.IR "x * (2^exp)" .
-
-If
-.I exp
-is zero, then
-.I x
-is returned.
-
-If
-.I x
-is a NaN,
-a NaN is returned.
-
-If
-.I x
-is positive infinity (negative infinity),
-positive infinity (negative infinity) is returned.
-
-If the result underflows,
-a range error occurs,
-and zero is returned.
-
-If the result overflows,
-a range error occurs,
-and the functions return
-.BR HUGE_VAL ,
-.BR HUGE_VALF ,
-or
-.BR HUGE_VALL ,
-respectively, with a sign the same as
-.IR x .
-.SH ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.PP
-The following errors can occur:
-.TP
-Range error, overflow
-.I errno
-is set to
-.BR ERANGE .
-An overflow floating-point exception
-.RB ( FE_OVERFLOW )
-is raised.
-.TP
-Range error, underflow
-.I errno
-is set to
-.BR ERANGE .
-An underflow floating-point exception
-.RB ( FE_UNDERFLOW )
-is raised.
-.SH ATTRIBUTES
-.SS Multithreading (see pthreads(7))
-The
-.BR ldexp (),
-.BR ldexpf (),
-and
-.BR ldexpl ()
-functions are thread-safe.
-.SH CONFORMING TO
-C99, POSIX.1-2001.
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD, C89.
-.SH SEE ALSO
-.BR frexp (3),
-.BR modf (3),
-.BR scalbln (3)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.
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