1.\" $NetBSD: rand.3,v 1.3 1995/12/28 08:52:39 thorpej Exp $ 2.\" 3.\" Copyright (c) 1990, 1991 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the American National Standards Committee X3, on Information 8.\" Processing Systems. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. All advertising materials mentioning features or use of this software 19.\" must display the following acknowledgement: 20.\" This product includes software developed by the University of 21.\" California, Berkeley and its contributors. 22.\" 4. Neither the name of the University nor the names of its contributors 23.\" may be used to endorse or promote products derived from this software 24.\" without specific prior written permission. 25.\" 26.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36.\" SUCH DAMAGE. 37.\" 38.\" from: @(#)rand.3 6.7 (Berkeley) 6/29/91 39.\" 40.Dd June 29, 1991 41.Dt RAND 3 42.Os 43.Sh NAME 44.Nm rand , 45.Nm srand 46.Nd bad random number generator 47.Sh SYNOPSIS 48.Fd #include <stdlib.h> 49.Ft void 50.Fn srand "unsigned seed" 51.Ft int 52.Fn rand void 53.Sh DESCRIPTION 54.Bf -symbolic 55These interfaces are obsoleted by random(3). 56.Ef 57.Pp 58The 59.Fn rand 60function computes a sequence of pseudo-random integers in the range 61of 0 to 62.Dv RAND_MAX 63(as defined by the header file 64.Aq Pa stdlib.h ) . 65.Pp 66The 67.Fn srand 68function sets its argument as the seed for a new sequence of 69pseudo-random numbers to be returned by 70.Fn rand . 71These sequences are repeatable by calling 72.Fn srand 73with the same seed value. 74.Pp 75If no seed value is provided, the functions are automatically 76seeded with a value of 1. 77.Sh SEE ALSO 78.Xr random 3 79.Sh STANDARDS 80The 81.Fn rand 82and 83.Fn srand 84functions 85conform to 86.St -ansiC . 87