[Solved] Custom radix columns (+special characters) [closed]

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How about using the basic base 10 to any base conversion, modified for custom digits:

func numberToCustomRadix(_ number: Int, alphabet: String) -> String {
    let base = alphabet.count
    var number = number
    var result = ""
    repeat {
        let idx = alphabet.index(alphabet.startIndex, offsetBy: number % base)
        result = [alphabet[idx]] + result
        number /= base
    } while number > 0
    return result
}

numberToCustomRadix(3, alphabet: "012") // 10
numberToCustomRadix(4, alphabet: "abc") // bb
numberToCustomRadix(5, alphabet: "%#9") // #9

Note that the problem with a custom alphabet is the fact that it’s hard to guarantee at compile time that the alphabet contains distinct characters. E.g. an “aaabbbccc” alphabet will generate all kind of conversion problems.

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solved Custom radix columns (+special characters) [closed]