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Normally people use the computer's clock. For example:

int timeSec = time(0)

But I need 4 independent non-repeatable ints, generated pretty much simulateously.

Peter O.
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Tim Crinion
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  • The clock is generally used to seed the random number generator, not as the random number itself. Information on random number generation: https://en.cppreference.com/w/cpp/numeric/random – Retired Ninja Dec 15 '20 at 09:47

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You could find it here if you avoid the range and check if your number is not repeated:

Generate random numbers uniformly over an entire range

Enrique Nares
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