.\" 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.
.\"
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.\" notice, this list of conditions and the following disclaimer in the
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.\" 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
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.\" @(#)frexp.3 8.1 (Berkeley) 6/4/93
.\"
.\" $FreeBSD$
.Dd June 4, 1993
.Dt FREXP 3
.Os
.Sh 名称
.Nm frexp
.Nd 浮動小数を小数部と整数部に変換
.Sh 書式
.Fd #include <math.h>
.Ft double
.Fn frexp "double value" "int *exp"
.Sh 解説
.Fn frexp
関数は、浮動小数を分割して、正規化された小数部分と
2 の整数累乗に分けます。
整数部は、
.Fa exp
が指す
.Em int
オブジェクトに保存されます。
.Sh 戻り値
.Fn frexp
関数は、区間
.Bq 1/2 , 1
に入る、もしくは大きさがゼロであり、かつ、
それに 2 の
.Fa *exp
乗を掛けると
.Fa value
と等しくなる
.Em double
の値
.Em x
を戻します。
.Fa value
がゼロである場合、結果のどちらの部分もゼロになります。
.Sh 関連項目
.Xr ldexp 3 ,
.Xr math 3 ,
.Xr modf 3
.Pp
.Sh 規格
.Fn frexp
関数は、
.St -ansiC
に準拠しています。
.\"X kuma 1999-11-6
