implementation of rand()

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Check out this collection of random number generators from George Marsaglia. He’s a leading expert in random number generation, so I’d be confident using anything he recommends. The generators in that list are tiny, some requiring only a couple unsigned longs as state.

Marsaglia’s generators are definitely “high quality” by your standards of long period and good uniform distribution. They pass stringent statistical tests, though they wouldn’t do for cryptography.

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