arc4random

I have an array of numbers that have been generated randomly and I am then trying to query Firebase for a question that is equal to the value at index [0] in the array of chosen numbers. The problem at the moment is that I get an error Cannot subscript a value of type '[UInt32]' . P.S. I am not extremly experienced in swift so exact code solutions would be very apreciated! I have also attached my firebase structure... import UIKit import Firebase class QuestionViewController: UIViewController { let ref = Firebase(url: "https://123test123.firebaseio.com/questions") override func viewDidLoad() {

I'm trying to get this part of the app to work were the user clicks a button and a label prints a randomly generated number between 1-12. I've been able to successfully do that, but I also want it to not repeat any random numbers that have already been printed. What I've tried doing is putting any printed number into an array, and then checking the array each time it generates a new number. I've gotten it to work in the Playground, but cannot get it working with a real project. Here is the code for my project. var usedNumbers = [Int]() var randomConv = 0 func randomize() { lblRandom.text = "\

I am trying to listen to the Foxycart XML Datafeed in C# and running into an issue which boils down to encryption. In short, they send over their data as encoded and encrypted XML using RC4 encryption . To test, they have some (user submitted) sample code to test this with C# . I tried using this sample RC4 decryption code provided by one of the users but it doesn't seem to work and their support staff thinks its down with the C# RC4 algorithm. Since they are not C# experts, i figured i would ask here. Here is the post on the FoxyCart forum Anyway, here is the code that (tries to) simulate the

I have a question about the arc4random() function in Objective-C. In the examples I have seen online, there is a % symbol right after the function call. I think of % as the modulus operator, so does this symbol have another meaning when used after arc4random() ? How does it work? No special meaning. Applying a modulus after arc4random() (or any other random function) is a common pattern to restrict the min/max of the random. arc4random() % 78 will return you a number between 0 and 77, for example. 来源： https://stackoverflow.com/questions/8962848/arc4random-and-operator

int randomNumber = (arc4random() % 83) + 1; Is this the best way to generate "the most random" number? Or is there a better way to generate a random number? arc4random has a superior algorithm for generating random numbers based on the current time. There are other rand functions but they are not as good and require seeding. When you use arc4random you avoid one pitfall of using % with linear congruential generators (which is the usual algorithm used by rand ): the low-order bits aren't less random. However, you still have truncation issues: i.e., because (1 << 32) % 83 is 77, that means that