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+.\" 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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. 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.
+.\"
+.\"     @(#)ldexp.3	8.2 (Berkeley) 4/19/94
+.\" %FreeBSD: src/lib/libc/gen/ldexp.3,v 1.5.2.3 2001/12/14 18:33:51 ru Exp %
+.\"
+.\" $FreeBSD$
+.\"
+.Dd April 19, 1994
+.Dt LDEXP 3
+.Os
+.Sh 名称
+.Nm ldexp
+.Nd 浮動小数点数値と 2 の整数累乗関数との乗算
+.Sh ライブラリ
+.Lb libc
+.Sh 書式
+.In math.h
+.Ft double
+.Fn ldexp "double x" "int exp"
+.Sh 解説
+.Fn ldexp
+関数は浮動小数点の数値と 2 の整数累乗関数との乗算を行います。
+.Sh 戻り値
+.Fn ldexp
+関数は、
+.Fa x
+と 2 の
+.Fa exp
+乗との乗算結果を返します。
+.Pp
+計算結果に桁あふれが発生した場合、外部変数
+.Va errno
+に
+.Er ERANGE
+がセットされ、値
+.Dv HUGE
+が返されます。
+.Sh 関連項目
+.Xr frexp 3 ,
+.Xr math 3 ,
+.Xr modf 3
+.Sh 規格
+.Fn ldexp
+関数は
+.St -isoC
+に適合しています。