Code.java

package Homework;

public class Code {
    public static void main(String[] args) {

        class Roman {
            int value(char r) {
                if (r == 'I')
                    return 1;
                if (r == 'V')
                    return 5;
                if (r == 'X')
                    return 10;
                if (r == 'L')
                    return 50;
                if (r == 'C')
                    return 100;
                if (r == 'D')
                    return 500;
                if (r == 'M')
                    return 1000;
                return -1;
            }

            int romanToInt(String s) {
                int total = 0;
                for (int i = 0; i < s.length(); i++) {
                    int s1 = value(s.charAt(i));
                    if (i + 1 < s.length()) {
                        int s2 = value(s.charAt(i + 1));
                        if (s1 >= s2) {
                            total = total + s1;
                        } else {
                            total = total - s1;
                        }
                    } else {
                        total = total + s1;
                    }
                }
                return total;
            }

            // Driver code
            public static void main(String args[]) {
                Roman ob = new Roman();
                String val = "MCMXCIV";
                System.out.println(ob.romanToInt(val));
            }
        }
    }
}