//Roman.java

import java.awt.*;
import javax.swing.*;

public class Roman extends JApplet {    
    public void init() {

	char c;
	String romans;
	int sum;

	do {
	    romans = JOptionPane.showInputDialog( "Enter Roman number" );
	    sum = 0;

	    for (int i=0; i<romans.length(); i++) {
		c = romans.charAt(i);
		c = Character.toUpperCase(c);
		switch (c) {
		case 'M': sum += 1000;
		    break;
		case 'D': sum += 500;
		    break;
		case 'C': sum += 100;
		    break;
		case 'L': sum += 50;
		    break;
		case 'X': sum += 10;
		    break;
		case 'V': sum += 5;
		    break;
		case 'I': sum += 1;
		    break;
		default:   //ignore invalid characters
		}
	    }

	    JOptionPane.showMessageDialog(null, "equals "+sum);
	} while (!romans.equals(""));
    }
}