Question

How to select random two consecutive digits from a number in Swift

Answer 1

import Foundation

func getRandomTwoDigits(_ num: Int) -> String {
    let s = String(num)

    guard s.count >= 2 else {
        return "Error: number must have at least 2 digits"
    }

    let start = Int.random(in: 0..<(s.count - 1)) 
    let startIndex = s.index(s.startIndex, offsetBy: start)
    let endIndex = s.index(startIndex, offsetBy: 2)

    return String(s[startIndex..<endIndex])
}

func main() {
    let num = 1234567
    
    let randomTwo = getRandomTwoDigits(num)
    print("Random two digits: \(randomTwo)")
}

main()


/*
run:

Random two digits: 67

*/

 

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