/* convert decimal number to roman number M = 1000 D = 500 C = 100 L = 50 X = 10 V = 5 I = 1 */ import java.util.*; public class Program { public static void main(String[] args) { Scanner scan = new Scanner(System.in); int number = scan.nextInt(); toRoman(number); } public static void toRoman (int number){ List c = new ArrayList<>(); if(number <= 0){ System.out.println("Wrong"); } while(number != 0){ if(number >= 1000){ putDigit('M',number/1000,c); number %=1000; }else if(number >= 500){ if(number < 900){ putDigit('D',number/500,c); number %=500; }else{ subDigit('C','M',c); number -= 900; } }else if(number >= 100){ if(number < 400){ putDigit('C',number/100,c); number %=100; }else{ subDigit('C','D',c); number -= 400; } }else if(number >= 50){ if(number < 90){ putDigit('L',number/50,c); number %=50; }else{ subDigit('X','C',c); number -=90; } }else if(number >= 10){ if(number < 40){ putDigit('X',number/10,c); number %=10; }else{ subDigit('X','L',c); number -=40; } }else if(number >= 5){ if(number < 9){ putDigit('V',number/5,c); number %=5; }else{ subDigit('I','X',c); number -= 9; } }else{ if(number < 4){ putDigit('I',number,c); number %=1; }else{ subDigit('I','V',c); number -=4; } } } String str = ""; for(char ch : c){ str += ch; } System.out.println(str); } public static void putDigit(char n ,int num ,List c){ for (int y = 0 ; y < num ;y++){ c.add(n); } } public static void subDigit (char n1 ,char n2 ,List c){ c.add(n1); c.add(n2); } }

decimal to roman