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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" References consulted:
.\" Linux libc source code
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\" 386BSD man pages
.\" Modified Mon Mar 29 22:48:44 1993, David Metcalfe
.\" Modified Wed Apr 28 01:35:00 1993, Lars Wirzenius
.\" Modified Sat Jul 24 18:39:41 1993, Rik Faith (faith@cs.unc.edu)
.\" Modified Thu May 18 10:10:13 1995, Rik Faith (faith@cs.unc.edu) to add
.\" better discussion of problems with rand on other systems.
.\" (Thanks to Esa Hyyti{ (ehyytia@snakemail.hut.fi).)
.\" Modified Fri Apr 10 01:47:03 1998, Nicolus Lichtmaier <nick@debian.org>
.\" with contribution from Francesco Potorti <F.Potorti@cnuce.cnr.it>
.\"
.\" Japanese Version Copyright (c) 1997 YOSHINO Takashi
.\" all rights reserved.
.\" Translated Tue Jan 21 21:10:54 JST 1997
.\" by YOSHINO Takashi <yoshino@civil.jcn.nihon-u.ac.jp>
.\" Updated Sun Sep 24 18:36:44 JST 2000
.\" by Kentaro Shirakata <argrath@ub32.org>
.\"
.TH RAND 3 "18 May 1995" "GNU" "Linux Programmer's Manual"
.SH ̾
rand, srand \- ؿ
.SH
.nf
.B #include <stdlib.h>
.sp
.B int rand(void);
.sp
.BI "void srand(unsigned int " seed );
.fi
.SH
\fBrand()\fP ؿ 0 \fBRAND_MAX\fR δ֤ε֤
.PP
\fBsrand()\fPؿϡ
\fBrand()\fPؿǺ뵿οȤơ
ΰͤѤ롣
δؿѤƺ줿ϡ
Ʊͤ˻Ѥ\fBsrand()\fPƤ֤Ȥˤäơ
Ƹ뤳ȤǽǤ롣
.PP
ͤͿʤˤϡ\fBrand()\fPؿ
ưŪ 1 Ȥ롣
.SH ֤
\fBrand()\fPؿ 0 RAND_MAX δ֤ο֤
\fBsrand()\fPؿϤɤΤ褦֤ͤʤ
.SH
\fBrand()\fP\fBsrand()\fP Linux C Library Ǥ
\fBrandom()\fP\fBsrandom()\fP ΤդĤδؿƱ
르ꥺѤƤ롣Τᡢ̤ΥӥåȤϾ̤ΥӥåȤ
Ʊ餤˥Ǥ롣
Ǥ
.B rand()
μϡ̤ΥӥåȤ̤ΥӥåȤۤɥˤʤäƤϤʤ
.PP
.I Numerical Recipes in C: The Art of Scientific Computing
(William H. Press, Brian P. Flannery, Saul A. Teukolsky, William
T. Vetterling; New York: Cambridge University Press, 1992 (2nd ed.,
p. 277))
ǤϡΤ褦ʥȤʤƤ롣
.RS
1 10 δ֤ΤǤС
.RS
.sp
j=1+(int) (10.0*rand()/(RAND_MAX+1.0));
.sp
.RE
Τ褦˾̥ӥåȤѤ뤳ȡ
.RS
.sp
j=1+(rand() % 10);
.sp
.RE
Τ褦ʡ̤ΥӥåȤѤ褦ˡϰڻߤ뤳ȡ
.RE
.PP
ʣǤ롣Ҥ
.I Numerical Recipes in C
ǤŪȤͥ줿 7 ()ŸƤ롣
.PP
ŪʵˤĤƤ Donald E. Knuth
.IR "The Art of Computer Programming" ,
volume 2 (Seminumerical Algorithms), 2nd ed.; Reading, Massachusetts:
Addison-Wesley Publishing Company, 1981
3 ()衣ϡ
μŪˤĤƤ⿼夷Ƥ롣
.SH
SVID 3, BSD 4.3, ISO 9899
.SH Ϣ
.BR random (3),
.BR srandom (3),
.BR initstate (3),
.BR setstate (3)
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