189 lines
4 KiB
Groff
189 lines
4 KiB
Groff
.\" Copyright (c) 1985, 1991 Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91
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.\" %FreeBSD: src/lib/msun/man/ieee.3,v 1.5.2.2 2001/03/06 16:46:24 ru Exp %
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.\"
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.\" $FreeBSD$
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.Dd February 25, 1994
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.Dt IEEE 3
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.Os
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.Sh ̾¾Î
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.Nm copysign ,
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.Nm copysignf ,
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.Nm finite ,
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.Nm finitef ,
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.Nm ilogb ,
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.Nm ilogbf ,
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.Nm nextafter ,
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.Nm nextafterf ,
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.Nm remainder ,
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.Nm remainderf ,
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.Nm scalbn ,
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.Nm scalbnf
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.Nd IEEE ±é»»´Ø¿ô
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.Sh ½ñ¼°
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.Fd #include <math.h>
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.Ft double
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.Fn copysign "double x" "double y"
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.Ft float
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.Fn copysignf "float x" "float y"
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.Ft int
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.Fn finite "double x"
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.Ft int
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.Fn finitef "float x"
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.Ft int
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.Fn ilogb "double x"
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.Ft int
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.Fn ilogbf "float x"
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.Ft double
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.Fn nextafter "double x" "double y"
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.Ft float
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.Fn nextafterf "float x" "float y"
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.Ft double
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.Fn remainder "double x" "double y"
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.Ft float
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.Fn remainderf "float x" "float y"
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.Ft double
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.Fn scalbn "double x" "int n"
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.Ft float
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.Fn scalbnf "float x" "int n"
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.Sh ²òÀâ
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¤³¤ì¤é¤Î´Ø¿ô¤Ï¡¢
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.St -ieee754
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¤Ë¤è¤Ã¤ÆÍ×µá¤Þ¤¿¤Ï¿ä¾©¤µ¤ì¤Æ¤¤¤Þ¤¹¡£
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.Pp
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.Fn copysign
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¤ª¤è¤Ó
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.Fn copysignf
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¤Ï¡¢
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.Fa x
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¤ÎÉ乿¤ò
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.Fa y
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¤ÎÉ乿¤ËÃÖ¤´¹¤¨¤Æ
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.Fa x
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¤òÊÖ¤·¤Þ¤¹¡£
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.Pp
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\-\*(If \*(Lt
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.Fa x
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\*(Lt +\*(If
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¤Î»þ¤Ë¤Ï¡¢
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.Fn finite
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¤ª¤è¤Ó
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.Fn finitef
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¤Ï¡¢ÃÍ 1 ¤òÊÖ¤·¤Þ¤¹¡£¤½¤¦¤Ç¤Ê¤¤»þ (
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.Pf \\*(Ba Ns Fa x Ns \\*(Ba
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= \*(If ¤Þ¤¿¤Ï
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.Fa x
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¤¬ \*(Na ¤Î»þ) ¤Ë¤Ï¡¢0 ¤¬ÊÖ¤µ¤ì¤Þ¤¹¡£
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.Pp
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.Fn ilogb
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¤ª¤è¤Ó
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.Fn ilogbf
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¤Ï¡¢
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.Fa x
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¤Î
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.Fa n
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¾è¤òÀ°¿ô·¿¤ÇÊÖ¤·¤Þ¤¹¡£
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.Fn ilogb \*(Pm\*(If
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¤Ï
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.Dv INT_MAX
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¤òÊÖ¤·¡¢
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.Fn ilogb 0
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¤Ï
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.Dv INT_MIN
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¤òÊÖ¤·¤Þ¤¹¡£
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.Pp
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.Fn nextafter
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¤ª¤è¤Ó
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.Fn nextafterf
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¤Ï¡¢¼¡¤Î¥Þ¥·¥óɽ¼¨²Äǽ¤Ê¿ô¤ò
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.Fa x
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¤«¤é
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.Fa y
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Êý¸þ¤ËÊÖ¤·¤Þ¤¹¡£
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.Pp
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.Fn remainder
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¤ª¤è¤Ó
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.Fn remainderf
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¤Ï¡¢¾ê;
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.Fa r
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:=
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.Fa x
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\-
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.Fa n\(**y
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¤òÊÖ¤·¤Þ¤¹¡£¤³¤Î¤È¤
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.Fa n
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¤Ï
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.Bk -words
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.Fa x Ns / Ns Fa y
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.Ek
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¤ÎÀµ³Î¤ÊÃͤ˺Ǥâ¶á¤¤À°¿ô¤Ç¤¹¡£¹¹¤Ë¡¢
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.Pf \\*(Ba Fa n
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\-
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.Sm off
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.Fa x No / Fa y No \\*(Ba
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.Sm on
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=
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1/2
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¤Ê¤é¤Ð¡¢
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.Fa n
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¤Ï¶ö¿ô¤Ç¤¹¡£¤½¤Î·ë²Ì¡¢¾ê;¤ÏÀµ³Î¤Ë·×»»¤µ¤ì¡¢
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.Sm off
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.Pf \\*(Ba Fa r No \\*(Ba
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.Sm on
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\*(Le
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.Sm off
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.Pf \\*(Ba Fa y No \\*(Ba/2
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.Sm on
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¤È¤Ê¤ê¤Þ¤¹¡£¤·¤«¤·¡¢
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.Fn remainder x 0
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¤ª¤è¤Ó
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.Fn remainder \*(If 0
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¤Ï¡¢\*(Na ¤òÀ¸À®¤¹¤ë̵¸ú¤Ê±é»»¤Ç¤¹¡£
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.Pp
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.Fn scalbn
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¤ª¤è¤Ó
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.Fn scalbnf
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¤Ï¡¢»Ø¿ôÁàºî¤Ë¤è¤Ã¤Æ·×»»¤µ¤ì¤¿
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.Fa x Ns \(**(2** Ns Fa n )
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¤òÊÖ¤·¤Þ¤¹¡£
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.Sh ´ØÏ¢¹àÌÜ
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.Xr math 3
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.Sh Îò»Ë
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.Nm ieee
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´Ø¿ô¤Ï¡¢
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.Bx 4.3
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¤ÇÅо줷¤Þ¤·¤¿¡£
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.Sh µ¬³Ê
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.St -ieee754
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