morning code challenge week 10

codeChallengeWeek10.swift

import Foundation

func doAsTheRomansDoAndNumeralize(_ number: Int) -> String {
    guard number > 0 else { return "" }
    var romanNumeral = ""
    
    let mRemainder = romanize(number: number, romanNumeral: &romanNumeral, value: 1000, romanSymbol: "M")
    let cmRemainder = romanize(number: mRemainder, romanNumeral: &romanNumeral, value: 900, romanSymbol: "CM")
    let dRemainder = romanize(number: cmRemainder, romanNumeral: &romanNumeral, value: 500, romanSymbol: "D")
    let cdRemainder = romanize(number: dRemainder, romanNumeral: &romanNumeral, value: 400, romanSymbol: "CD")
    let cRemainder = romanize(number: cdRemainder, romanNumeral: &romanNumeral, value: 100, romanSymbol: "C")
    let xcRemainder = romanize(number: cRemainder, romanNumeral: &romanNumeral, value: 90, romanSymbol: "XC")
    let lremainder = romanize(number: xcRemainder, romanNumeral: &romanNumeral, value: 50, romanSymbol: "L")
    let xlremainder = romanize(number: lremainder, romanNumeral: &romanNumeral, value: 40, romanSymbol: "XL")
    let xremainder = romanize(number: xlremainder, romanNumeral: &romanNumeral, value: 10, romanSymbol: "X")
    let ixremainder = romanize(number: xremainder, romanNumeral: &romanNumeral, value: 9, romanSymbol: "IX")
    let vremainder = romanize(number: ixremainder, romanNumeral: &romanNumeral, value: 5, romanSymbol: "V")
    let ivremainder = romanize(number: vremainder, romanNumeral: &romanNumeral, value: 4, romanSymbol: "IV")
    let _ = romanize(number: ivremainder, romanNumeral: &romanNumeral, value: 1, romanSymbol: "I")
    
    return romanNumeral
}

func romanize(number: Int, romanNumeral: inout String, value: Int, romanSymbol: String) -> Int {
    let symbol = (number / value)
    if symbol > 0 {
        for _ in 1...symbol {
            romanNumeral.append(romanSymbol)
        }
    }
    return number % value
}



doAsTheRomansDoAndNumeralize(2500) //return MMD
doAsTheRomansDoAndNumeralize(0) // returns ''
doAsTheRomansDoAndNumeralize(42) // returns XLII
doAsTheRomansDoAndNumeralize(1974) // returns MCMLXXIV