public class Person {
    String		firstName;
    String		lastName;
    int			age;
    char		gender;
    boolean		retired;
    Address		address;

	// This is the zero-parameter constructor
    public Person() {
        firstName = "UNKNOWN";
        lastName = "UNKNOWN";
        gender = '?';
        retired = false;
        age = 0;
        address = null;
    }

    // This is a 4-parameter constructor
    public Person(String f, String l, int a, char g) {
        firstName = f;
        lastName = l;
        age = a;
        gender = g;
        retired = false;
        address = null;
    }


    // This is another 4-parameter constructor
    public Person(String f, String l, char g, boolean r) {
        firstName = f;
        lastName = l;
        gender = g;
        retired = r;
        age = 0;
        address = null;
    }


    // This is a 6-parameter constructor
    public Person(String f, String l, int a, char g, boolean r, Address d) {
        firstName = f;
        lastName = l;
        age = a;
        gender = g;
        retired = r;
        address = d;
    }

    public int computeDiscount() {
        if ((this.gender == 'F') &&
            (this.age < 13 || this.retired))
            return 50;
        return 0;
    }

	public boolean isOlderThan(Person  x) {
	    return (this.age > x.age);
	}

	public Person oldest(Person  x) {
	    if (this.age > x.age)
	        return this;
	    else
	        return x;
	}

	public void retire() {
	    this.retired = true;
	}

	public void swapNameWith(Person x) {
	    String	tempName;

	    // Swap the first names
	    tempName = this.firstName;
	    this.firstName = x.firstName;
	    x.firstName = tempName;

	    // Swap the last names
	    tempName = this.lastName;
	    this.lastName = x.lastName;
	    x.lastName = tempName;
	}

}