Need help with basic math functions

Hey guys I cant seem to got my computations to work! Any clue and what im doing wrong and also how do I get to display an decimal point? thanks very much
in eclipse it says something like string is undefined or something similar

import java.util.Scanner;
import javax.swing.JOptionPane;

public class converter {

public static final int ONE_PENCE_IN_NEW_PENNIES= 67;
public static final int ONE_SHILLING_IN_NEW_PENNIES= 804;
public static final int ONE_OLD_POUND_IN_NEW_PENNIES= 16080;
public static final int ONE_NEW_POUND_IN_NEW_PENNIES= 100;
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

String oldPoundsInput= JOptionPane.showInputDialog("Insert Pounds:");
Scanner oldPoundsScanner= new Scanner(oldPoundsInput);

String oldShillingsInput= JOptionPane.showInputDialog("Insert Shillings:");
Scanner oldShillingsScanner= new Scanner(oldShillingsInput);

String oldPenceInput= JOptionPane.showInputDialog("Insert Pence:");
Scanner oldPenceScanner= new Scanner(oldPenceInput);

int newPounds = ((oldPenceInput)*(ONE_PENCE_IN_NEW_PENNIES)) + ((oldShillingsInput)*(ONE_SHILLING_IN_NEW_PENNIES) ) + ((oldPoundsInput)*(ONE_OLD_POUND_IN_NEW_PENNIES));

JOptionPane.showMessageDialog(null, "The value is:"+newPounds);
}

}

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Quote:

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it says something like string is undefined or something similar

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You have to put this thing here in that place over there or something similar. Seriously how do you expect anyone to have a clue what you are talking about. Copy paste the error messages so people can see what they say. Something similar can be a different but similar problem.

You are trying to do a multiplication of a String and an integer.

Try and use something like double values for currency.

You can then format the output to round off the double to 2 decimal places.