abstract class Account {
    
    protected int number;
    protected double bal;
    protected Person owner;

    public int getNumber() {
	//Rumpf einfügen
    }
    public double getBal() {
	//Rumpf einfügen
    }
    public Person getOwner() {
	//Rumpf einfügen
    }
    public void deposit(double d) {
        //Rumpf einfügen
    }
    public abstract boolean withdraw(double d);
}


class SavingsAccount extends Account {

    private double interestRate;

    public SavingsAccount(int no, double iR, Person o) {
        //Rumpf einfügen
    }
    public boolean withdraw(double d) {
	//Rumpf einfügen
    }
    public void addInterest() {
	//Rumpf einfügen
    }
}

class CheckingAccount extends Account {
 
    private double chargeRate;

    public CheckingAccount(int no, double cR, Person o) {
        //Rumpf einfügen
    }
    public boolean withdraw(double d) {
	//Rumpf einfügen
    }
    public void payCharge() {
	//Rumpf einfügen
    }
}