class Roman {

    static romanNumerals = [
        1000: "M", 900: "CM", 500: "D", 400: "CD",
        100: "C", 90: "XC", 50: "L", 40: "XL",
        10: "X", 9: "IX", 5: "V", 4: "IV",
        1: "I"
    ]

    static String toRoman(int number) {
        def result = ""
        romanNumerals.each { key, value ->
            while (number >= key) {
                result += value
                number -= key
            }
        }
        result
    }
}

def decimalNumber = 2000
println("Die Dezimalzahl $decimalNumber wird in römischen Zahlen geschrieben als: ${Roman.toRoman(decimalNumber)}")