public class AC{
    private int id;
    private double balance;
    // Constructor
    public AC (int i, double b){
	id = i;
	balance = b;
    }
    // Accessor
    public int getId(){
	return id;
    }
    // Mutator
    public void update (double amount){
	balance += amount;
    }
    // String form
    public String toString(){
	return id + "\t" + balance;
    }
}