CoinPurse.java

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

public class CoinPurse{
  
  private double amount;
  private int numCoins;
  
  public CoinPurse(){
    amount = 0;
    numCoins = 0;
  }
  
  public void addTo(Coin c){
    amount = amount + c.getValue();
    numCoins = numCoins + 1;    
  }
  
  public void removeFrom(Coin c){
    amount = amount - c.getValue();
    numCoins = numCoins -1;
  }
  
  public double getAmount(){
    return amount;
  }
}