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Objective - C and Random »February 25, 2009 1:13:52 PM

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So I am working on an app, like always, and it needed to generate a random number from 0-3 no problem I thought and just typed in random() % 3; thinking that would be fine. Well it kept returning the same exact sequence!!! So how is that at all random? After about a half of an hour I found arc4random(), switched it our for random and it works like a charm :)

This is one of those huge gotcha's for me, I assumed that random() would generate a random number but its pseudo random. The arc4random() uses a superior algorithm to rand. You don't even need to set a seed. So just a small note to anyone else so that they don't get tripped on why random() is generating the same number. Sure you could have approached this other ways like set a SEED but this seems to be the simplest approach. Reddit TwitThis Facebook StumbleUpon Mixx Technorati Google


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