As pointed out in other posts below, it is better to use arc4random_uniform. (When this answer was originally written, arc4random_uniform was not available). Besides avoiding the modulo bias of arc4random() % x, it also avoids a seeding problem with arc4random when used recursively in short timeframes. arc4random_uniform(4) will generate 0, 1, 2 or 3. Thus … Read more
arc4random returns an integer between 0 and (2^32)-1 while arc4random_uniform returns an integer between 0 and the upper bound you pass it. From man 3 arc4random: arc4random_uniform() will return a uniformly distributed random number less than upper_bound. arc4random_uniform() is recommended over constructions like “arc4random() % upper_bound” as it avoids “modulo bias” when the upper bound … Read more
You could simply use integer values like this: int lowerBound = … int upperBound = … int rndValue = lowerBound + arc4random() % (upperBound – lowerBound); Or if you mean you want to include float number between lowerBound and upperBound? If so please refer to this question: https://stackoverflow.com/a/4579457/1265516
Random value in [0, 1[ (including 0, excluding 1): double val = ((double)arc4random() / UINT32_MAX); A bit more details here. Actual range is [0, 0.999999999767169356], as upper bound is (double)0xFFFFFFFF / 0x100000000.
This is extension for random numbers of Int, Double, Float, CGFloat Swift 3 & 4 & 5 syntax import Foundation import CoreGraphics // MARK: Int Extension public extension Int { /// Returns a random Int point number between 0 and Int.max. static var random: Int { return Int.random(n: Int.max) } /// Random integer between 0 … Read more
let randomIntFrom0To10 = Int.random(in: 1..<10) let randomFloat = Float.random(in: 0..<1) // if you want to get a random element in an array let greetings = [“hey”, “hi”, “hello”, “hola”] greetings.randomElement()
I believe you should do dice1 = arc4random_uniform(6) + 1; to get the range 1 – 6. I don’t do iOS objective C nor have I any knowledge on swift-language though. The random method should return a value between 0 and 5, and + 1 will make it a value between 1 and 6. If … Read more