1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed by the University of 19.\" California, Berkeley and its contributors. 20.\" 4. Neither the name of the University nor the names of its contributors 21.\" may be used to endorse or promote products derived from this software 22.\" without specific prior written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34.\" SUCH DAMAGE. 35.\" 36.\" from: @(#)rand.3 6.7 (Berkeley) 6/29/91 37.\" $Id: rand.3,v 1.2 1993/08/01 07:44:20 mycroft Exp $ 38.\" 39.Dd June 29, 1991 40.Dt RAND 3 41.Os 42.Sh NAME 43.Nm rand , 44.Nm srand 45.Nd bad random number generator 46.Sh SYNOPSIS 47.Fd #include <stdlib.h> 48.Ft void 49.Fn srand "unsigned seed" 50.Ft int 51.Fn rand void 52.Sh DESCRIPTION 53.Bf -symbolic 54These interfaces are obsoleted by random(3). 55.Ef 56.Pp 57The 58.Fn rand 59function computes a sequence of pseudo-random integers in the range 60of 0 to 61.Dv RAND_MAX 62(as defined by the header file 63.Aq Pa stdlib.h ) . 64.Pp 65The 66.Fn srand 67function sets its argument as the seed for a new sequence of 68pseudo-random numbers to be returned by 69.Fn rand . 70These sequences are repeatable by calling 71.Fn srand 72with the same seed value. 73.Pp 74If no seed value is provided, the functions are automatically 75seeded with a value of 1. 76.Sh SEE ALSO 77.Xr random 3 78.Sh STANDARDS 79The 80.Fn rand 81and 82.Fn srand 83functions 84conform to 85.St -ansiC . 86