Question

How to convert an integer to Roman numerals in Swift

Answer 1

import Foundation

struct IntegerToRoman {
    static func intToRoman(_ num: Int) -> String {
        let values = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1]
        let symbols = ["M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"]

        var n = num
        var roman = ""

        for (value, symbol) in zip(values, symbols) {
            while n >= value {
                n -= value
                roman.append(contentsOf: symbol)
            }
        }
        
        return roman
    }
}

print(IntegerToRoman.intToRoman(1994)) 
print(IntegerToRoman.intToRoman(196))  
print(IntegerToRoman.intToRoman(9))    



/*
run:

MCMXCIV
CXCVI
IX

*/

 

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