34 lines
646 B
Groff
34 lines
646 B
Groff
|
.\" @(#)rand.3c 6.2 (Berkeley) 9/29/85
|
||
|
|
.\"
|
||
|
|
.TH RAND 3 "September 29, 1985"
|
||
|
|
.AT 3
|
||
|
|
.SH NAME
|
||
|
|
rand, srand \- random number generator
|
||
|
|
.SH SYNOPSIS
|
||
|
|
.nf
|
||
|
|
.ft B
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
void srand(unsigned \fIseed\fP)
|
||
|
|
unsigned rand(void)
|
||
|
|
.ft R
|
||
|
|
.fi
|
||
|
|
.SH DESCRIPTION
|
||
|
|
.B Rand
|
||
|
|
uses a multiplicative congruential
|
||
|
|
random number generator with period
|
||
|
|
.if t 2\u\s732\s0\d
|
||
|
|
.if n 2**32
|
||
|
|
to return successive pseudo-random
|
||
|
|
numbers in the range from 0 to
|
||
|
|
.BR RAND_MAX .
|
||
|
|
.PP
|
||
|
|
The generator is reinitialized by calling
|
||
|
|
.B srand
|
||
|
|
with 1 as argument.
|
||
|
|
It can be set to a random starting point by calling
|
||
|
|
.B srand
|
||
|
|
with whatever you like as argument.
|
||
|
|
.SH "SEE ALSO"
|
||
|
|
.BR random (3).
|