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

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RAND(3) 										  RAND(3)

       rand, srand - random number generator

       int seed;

       rand( )

       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.

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