CoinPurse.java

import java.io.*;
import java.util.*;

public class CoinPurse {
    private double amount;

    public CoinPurse(){
	amount = 0;
    }

    public void addTo(Coin c){
	amount = amount + c.getValue();
    }

    public void removeFrom (Coin c){
	amount = amount - c.getValue();
    }

    public double getAmount(){
	return amount;
    }
}