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Unix Version 7 - man page for rand (v7 section 3)

RAND(3) 				       Library Functions Manual 				      RAND(3)

NAME
rand, srand - random number generator
SYNOPSIS
srand(seed) int seed; rand( )
DESCRIPTION
Rand uses a multiplicative congruential random number generator with period 232 to return successive pseudo- random numbers in the range from 0 to 215-1. The generator is reinitialized by calling srand with 1 as argument. It can be set to a random starting point by calling srand with whatever you like as argument. RAND(3)


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