Use of arc4random ()

VaR A = arc4random () % 40 + 10

Arc4random is a real pseudo-random function that returns a large number. Arc4random () % 40, return 0 ~ 39, so the range of A is 10 ~ 49.

The maximum value returned by arc4random is 0x100000000. Rand () is not a real pseudo-random number generator. arc4random is a real pseudo-random algorithm. Arc4random is recommended.

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Use of arc4random ()