public class TestBigNaturalSimple {

    public static void main (String[] args) {
	BigNatural b1 = new BigNatural();    //default constructor
	BigNatural b2 = new BigNatural(23);  //one-argument constructor
	BigNatural b3 = new BigNatural(b2);  //copy constructor
	
	b2.increment();
	b3.decrement();

	System.out.println(b1.toString());  //should print out O
    }
}