objective c - Random number from a range without a certain number in the middle of the range -

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i'm generating number 0 11 randomly this:

int n = arc4random() % 12;

but, i'd not 5 or 6 output. how can that?

if have such constraint, make explicit in code:

int n; {     n = arc4random() % 12; } while (n == 5 || n == 6); //retry if encountered 1 of unallowable values

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