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+.\"	$OpenBSD: ldexp.3,v 1.9 2025/06/06 21:50:10 schwarze Exp $
+.\"
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the American National Standards Committee X3, on Information
+.\" Processing Systems.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: June 6 2025 $
+.Dt LDEXP 3
+.Os
+.Sh NAME
+.Nm ldexp ,
+.Nm ldexpf ,
+.Nm ldexpl
+.Nd multiply floating-point number by integral power of 2
+.Sh SYNOPSIS
+.Lb libm
+.In math.h
+.Ft double
+.Fn ldexp "double x" "int exp"
+.Ft float
+.Fn ldexpf "float x" "int exp"
+.Ft long double
+.Fn ldexpl "long double x" "int exp"
+.Sh DESCRIPTION
+The
+.Fn ldexp
+function multiplies a floating-point number by an integral
+power of 2.
+The
+.Fn ldexpf
+function is a single precision version of
+.Fn ldexp .
+The
+.Fn ldexpl
+function is an extended precision version of
+.Fn ldexp .
+.Sh RETURN VALUES
+The
+.Fn ldexp ,
+.Fn ldexpf
+and
+.Fn ldexpl
+functions return the value of
+.Fa x
+times 2 raised to the power
+.Fa exp .
+.Pp
+If the resultant value would cause an overflow,
+the global variable
+.Va errno
+is set to
+.Er ERANGE
+and the value
+.Dv HUGE
+is returned.
+.Sh SEE ALSO
+.Xr frexp 3 ,
+.Xr modf 3
+.Sh STANDARDS
+The
+.Fn ldexp
+function conforms to
+.St -ansiC .