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 map = new HashMap();
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 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");
}
}
}
}