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NumberToRoman.java

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import java.util.Arrays;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Scanner;

public class NumberToRoman {

/**

* A function to convert a number to roman numerals Examples: num = 3 -> `III`,

* num = 58 --> `LVIII`

* @param num

* @return String

public static String intToRoman(int num) {

Map<Integer, String> map = new HashMap<Integer, String>();

map.put(1, "I");

map.put(4, "IV");

map.put(5, "V");

map.put(9, "IX");

map.put(10, "X");

map.put(40, "XL");

map.put(50, "L");

map.put(90, "XC");

map.put(100, "C");

map.put(400, "CD");

map.put(500, "D");

map.put(900, "CM");

map.put(1000, "M");

List<Integer> mapKeys = Arrays.asList(1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1);

int remainder = num;

StringBuilder result = new StringBuilder("");

int mapKeysIndex = 0;

while (remainder != 0) {

int currentComparison = mapKeys.get(mapKeysIndex);

if (remainder < currentComparison) {

mapKeysIndex++;

continue;

}

result.append(map.get(currentComparison));

remainder = remainder - currentComparison;

}

return result.toString();

}

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

while (true) {

try {

System.out.println("Please enter an Integer value");

int num = Integer.parseInt(sc.next());

System.out.println(intToRoman(num));

} catch (Exception e) {

System.out.println("Something went wrong, please make sure to enter integer only");

}