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Full Discussion: magic 8ball
Top Forums UNIX for Dummies Questions & Answers magic 8ball Post 302309793 by Ygor on Wednesday 22nd of April 2009 11:25:56 PM
Old 04-23-2009
You might need to srand() before you rand(), e.g...
Code:
$ function rand () { echo $1 | awk '{srand(); printf "%d\n", rand()*$1}'; }
$ rand 100
62
$ rand 100
77

 

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rand(3UCB)					     SunOS/BSD Compatibility Library Functions						rand(3UCB)

NAME
rand, srand - simple random number generator SYNOPSIS
/usr/ucb/cc [ flag ... ] file ... int rand(); int srand(seed) unsigned seed; DESCRIPTION
rand() uses a multiplicative congruential random number generator with period 2^32 to return successive pseudo-random numbers in the range from 0 to 2^31 -1. srand() can be called at any time to reset the random-number generator to a random starting point. The generator is initially seeded with a value of 1. SEE ALSO
cc(1B), drand48(3C), rand(3C), random(3C) NOTES
Use of these interfaces should be restricted to only applications written on BSD platforms. Use of these interfaces with any of the system libraries or in multi-thread applications is unsupported. The spectral properties of rand() leave a great deal to be desired. drand48(3C) and random(3C) provide much better, though more elaborate, random-number generators. The low bits of the numbers generated are not very random; use the middle bits. In particular the lowest bit alternates between 0 and 1. SunOS 5.11 30 Oct 2007 rand(3UCB)
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