CODEWITHSUNDEEP
arraysswiftrandomswift2
redisky
redisky

Reputation: 97

[Swift 2.2]: analog arc4random for range with negative numbers

I wrote a function that finds the greatest difference among all elements of the array. But I need the restriction on the input elements array [-5..20]. Unfortunately it does not support UInt32. What are similar to a solution to fill the array randomly from the range [-5..20]?Thank you!

func highDifferenceV ( n: Int) ->String{
        var a = [Int]() //array
        var dif = 0     // max difference
        var k = 0


        for _ in 0..<n {
            a.append(Int(arc4random_uniform(UInt32(20)))) // fill array


        }
        while k < a.count {  //search the greatest difference
            for i in 0..<n {
                if a[k] - a[i] > dif {
                    dif = a[k] - a[i]
                }
            }
            k++
        }
        print(a)
        return "Maximum difference =\(dif)"
    }

    highDifferenceV(75)

Upvotes: 0

Views: 167

Answers (1)

vacawama
vacawama

Reputation: 154681

To fill an array with values from -5...20, generate an number in the range 0...25 and then subtract 5:

for _ in 0..<n {
    a.append(Int(arc4random_uniform(UInt32(26)))-5) // fill array
}

In general, to generate a value in the range min...max, call arc4random_uniform with max - min + 1 and then add min.

Upvotes: 3

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