rand.3

unix v7是最后一个广泛发布的研究型UNIX版本

.TH RAND 3 
.SH NAME
rand, srand \- random number generator
.SH SYNOPSIS
.B srand(seed)
.br
.B int seed;
.PP
.B rand( )
.SH DESCRIPTION
.I Rand
uses a multiplicative congruential
random number generator
with period 2\u\s732\s0\d
to return successive pseudo-random
numbers in the range from 0 to 2\u\s715\s10\d\-1.
.PP
The generator is reinitialized by calling
.I srand
with 1 as argument.
It can be set to a random starting point by calling
.I srand
with whatever you like as argument.