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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 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 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-ldexp, ldexpf, ldexpl \- multiply floating-point number by integral power of 2
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double ldexp(double " x ", int " exp );
-.BI "float ldexpf(float " x ", int " exp );
-.BI "long double ldexpl(long double " x ", int " exp );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR ldexpf (),
-.BR ldexpl ():
-.nf
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
- || /* Since glibc 2.19: */ _DEFAULT_SOURCE
- || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions return 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\[ha]exp)" .
-.P
-If
-.I exp
-is zero, then
-.I x
-is returned.
-.P
-If
-.I x
-is a NaN,
-a NaN is returned.
-.P
-If
-.I x
-is positive infinity (negative infinity),
-positive infinity (negative infinity) is returned.
-.P
-If the result underflows,
-a range error occurs,
-and zero is returned.
-.P
-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.
-.P
-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
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR ldexp (),
-.BR ldexpf (),
-.BR ldexpl ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.P
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD, C89.
-.SH SEE ALSO
-.BR frexp (3),
-.BR modf (3),
-.BR scalbln (3)