.\" Copyright (c) 1991 The Regents of the University of California.
.\" All rights reserved.
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.\"     from: @(#)fmod.3	5.1 (Berkeley) 5/2/91
.\" %FreeBSD: src/lib/msun/man/fmod.3,v 1.5.2.2 2001/12/17 10:08:36 ru Exp %
.\"
.\" $FreeBSD$
.Dd May 2, 1991
.Dt FMOD 3
.Os
.Sh 名称
.Nm fmod ,
.Nm fmodf
.Nd 浮動小数の余りを求める関数
.Sh ライブラリ
.Lb libm
.Sh 書式
.In math.h
.Ft double
.Fn fmod "double x" "double y"
.Ft float
.Fn fmodf "float x" "float y"
.Sh 解説
.Fn fmod
関数と
.Fn fmodf
関数は、
.Fa x Ns / Fa y
の浮動小数点数の余りを算出します。
.Sh 戻り値
.Fa y
が 0 でない場合、結果が
.Fa x
と同じ符号になり、かつ、結果の大きさが
.Fa y
よりも小さくなるような整数
.Em i
に対して、
.Fn fmod
関数と
.Fn fmodf
関数は、値
.Sm off
.Fa x - Em i * Fa y
.Sm on
を返します。
.Fa y
が 0 である場合、ドメインエラーを発生させるか、または
.Fn fmod
関数と
.Fn fmodf
関数が 0 を返すかはシステムで定義されます。
.Sh 関連項目
.Xr math 3
.Sh 規格
.Fn fmod
関数は、
.St -isoC
適合しています。
.\"X kuma 1999-11-5