class Student {
    /*
     * data members/state variables
     */
    private String firstName, lastName, gender, phone, userid;
    private long studentNumber;
    private String[] courses;
    private int numCourses;
    
    /*
     *  Constructor
     */
    public Student(long stunum, String user) {
        studentNumber = stunum;
        userid = user;
        courses = new String[5];
        numCourses = 0;
    }

    /*
     * Simple getters and setters
     */
    public void setFirstName(String name) {
        if ( name.length() > 0 ) {
            firstName = name;
        } else {
            // error
        }
    }
    public String getFirstName() {
        return firstName;
    }
    public void setLastName(String name) {
        if ( name.length() > 0 ) {
            lastName = name;
        } else {
            // error
        }
    }
    public String getLastName() {
        return lastName;
    }
    public long getStudentNumber() {
        return studentNumber;
    }
    public String getUserID() {
        return userid;
    }
    public String getPhone() {
    	return phone;
    }
    public void setPhone(String number) {
    	if ( number.length() == 10 && number.charAt(0) != '1' ) {
            phone = number;
    	} else {
            // should cause an error here.
    	}
    }
    
    /*
     * Dealing with course registration
     */
    public void addCourse(String crs) {
    	if ( numCourses<5 ) {
    	    courses[numCourses] = crs;
    	    numCourses++;
    	} else {
            // error
    	}
    }
    public void printCourses() {
    	for( int i=0; i<numCourses; i++) {
            System.out.println(courses[i]);
    	}
    }
    
}