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.\" @(#)rand.3 6.7 (Berkeley) 6/29/91 37.\" 38.Dd June 29, 1991 39.Dt RAND 3 40.Os 41.Sh NAME 42.Nm rand , 43.Nm srand 44.Nd bad random number generator 45.Sh SYNOPSIS 46.Fd #include <stdlib.h> 47.Ft void 48.Fn srand "unsigned seed" 49.Ft int 50.Fn rand void 51.Sh DESCRIPTION 52.Bf -symbolic 53These interfaces are obsoleted by random(3). 54.Ef 55.Pp 56The 57.Fn rand 58function computes a sequence of pseudo-random integers in the range 59of 0 to 60.Dv RAND_MAX 61(as defined by the header file 62.Aq Pa stdlib.h ) . 63.Pp 64The 65.Fn srand 66function sets its argument as the seed for a new sequence of 67pseudo-random numbers to be returned by 68.Fn rand . 69These sequences are repeatable by calling 70.Fn srand 71with the same seed value. 72.Pp 73If no seed value is provided, the functions are automatically 74seeded with a value of 1. 75.Sh SEE ALSO 76.Xr random 3 77.Sh STANDARDS 78The 79.Fn rand 80and 81.Fn srand 82functions 83conform to 84.St -ansiC . 85