JavaDsa/RomanToDigit.java at main · RahulBiswas224/JavaDsa · GitHub

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import java.util.Scanner;
import java.util.HashMap;
import java.util.Map;

class RomanToDigitOperation
{

    private String romanString;
    private int digitValue;

    RomanToDigitOperation(String romaString)
    {
        this.romanString = romaString;
        this.romanToNum();
        System.out.println("The digit value is : "+digitValue);
    }

    int getDigitValue(char romanChar)
    {
        Map<Character , Integer> romanValueSet = new HashMap<>();
        romanValueSet.put('I',1);
        romanValueSet.put('V',5);
        romanValueSet.put('X',10);
        romanValueSet.put('L',50);
        romanValueSet.put('C',100);
        romanValueSet.put('D',500);
        romanValueSet.put('M',1000);

        return romanValueSet.get(Character.toUpperCase(romanChar));

    }

    void romanToNum()
    {
        for(int i=romanString.length() - 1;i>=1;i--)
        {
            if( (getDigitValue(romanString.charAt(i)) > getDigitValue(romanString.charAt(i-1))) )
            {
                digitValue += getDigitValue(romanString.charAt(i));
            }
            else if( (getDigitValue(romanString.charAt(i)) < getDigitValue(romanString.charAt(i+1))) )
            {
                digitValue -= getDigitValue(romanString.charAt(i));
            }
        }

        if( (getDigitValue(romanString.charAt(0)) < getDigitValue(romanString.charAt(1))) )
        {
            digitValue -= getDigitValue(romanString.charAt(0));
        }
        else
        {
            digitValue += getDigitValue(romanString.charAt(0));
        }
        // digitValue += getDigitValue(romanString.charAt(romanString.length()-1));

    }

}

public class RomanToDigit
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter the roman : ");
        String romanString = sc.nextLine();

        new RomanToDigitOperation(romanString);

        sc.close();
    }

}