Random Numbers in Objective-C Using Mod Range?

Answer 1

Java is just as high level as Objecive C here - in this case Java' Random.getInt() is the same as arc4random in that they both return a 32-bit pseudo-random number.

The issue raised in the URL (and I have seen elsewhere) is that rand()

could be repeating itself every 32768 values.

Whilst OSX's arc4random could have (2**1700) states.

But as in all uses of pseudo-random generators you need to be aware of their weaknesses before using them e.g. a preference for low bits in some generators and also the comment in the OpenBSD arc4random man page where it says

arc4random_uniform() is recommended over constructions like ``arc4random() % upper_bound'' as it avoids "modulo bias" when the upper bound is not a power of two.