CoinPurse.java

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

public class CoinPurse { 
    private double amount;

    public CoinPurse() { 
	amount = 0.0;
    }

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

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