A question about the sleep() function

While the sleep() function is executed, can another method in the same program run?

If not, how can I make 1 method run while the other is delayed?

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While the sleep() function is executed, can another method in the same program run?

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Yes. This technique is called multi threading.

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If not, how can I make 1 method run while the other is delayed?

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You can: Run either both in a thread or run one in a thread and the other one in the "main thread" (e.g. your application instance).