manual page distributed with 4.1BSD

SCCS-vsn: lib/libc/stdlib/rand.3 4.1

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+.\"    @(#)rand.3      4.1 (Berkeley) %G%
+.\"
+.TH RAND 3 VAX-11
+.AT 3
+.SH NAME
+rand, srand \- random number generator
+.SH SYNOPSIS
+.nf
+.B srand(seed)
+.B int seed;
+.PP
+.B rand()
+.fi
+.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\s731\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.