Need help with pointers and object composition

[IOSDEZ]

I have three classes to make, Person, the base class, and the derived classes Professor and Student. The student class is to have a Professor member variable called adviser, and the Professor should be able to create a Student array to hold up to 4 students as advisees.

I'm having several issues with developing these classes.

I'm not sure how to make a default constructor the class Student because I don't know what to do with my adviser member if there is no Professor object for me to automatically set it to.

I have the same problem with the class Professor, however an even bigger problem is I'm not sure how to set up the the pointer array to hold its advisees since once again, not student are being automatically passed to it (this may not be the correct terminology).

The second issue is to me a bigger problem, simply because I think it will have a bigger impact on my grade for the assignment.

Below I what I have so far. I would appreciate any input, and if there is anything else you think you need to know tell me.

And thanks ahead of time for any help.

#include <iostream>
#include <string>
using namespace std;

class Person
{
protected:
	string name;
public:
	void setName(string name); 
	string getName();
	Person(string name);
	Person();
};

class Professor: public Person
{
private:
	string employeeID;
	string officeNo;
	string officePhone;
	//Student *ptr;
public:
	void setEmployeeID(string employeedID);
	string getEmployeeID();
	void setOfficeNo(string officeNo);
	string getOfficeNo();
	void setOfficePhone(string officePhone);
	string getOfficePhone();
	Professor(string name,string employeeID, string officeNo, string officePhone);
};

class Student: public Person
{
private:
	string studentID;
	string major;
	Professor adviser;
public:
	void setStudentID(string studentID);
	string getStudentID();
	void setMajor(string major);
	string getMajor();
	Student(string name, string studentID, string major, Professor adviser);
	void setAdviser(Professor adviser);
	string getAdviser();
};

int main()
{
	Professor p1("John Williams", "e0123", "Combs 123", "3-1234");
	cout << "Professor: " << p1.getName() << endl;
	cout << "ID: " << p1.getEmployeeID() << endl;
	cout << "Office: " << p1.getOfficeNo() << endl;
	cout << "Phone: " << p1.getOfficePhone() << endl;
	cout << endl;

	Professor p2("Paul King", "e0222", "Combs 222", "3-222");
	cout << "Professor: " << p2.getName() << endl;
	cout << "ID: " << p2.getEmployeeID() << endl;
	cout << "Office: " << p2.getOfficeNo() << endl;
	cout << "Phone: " << p2.getOfficePhone() << endl;
	cout << endl;

	Student s1("Mary Jane", "s0123", "Accounting", p1);
	cout << "Student: " << s1.getName() << endl;
	cout << "ID: " << s1.getStudentID() << endl;
	cout << "Major: " << s1.getMajor() << endl;
	cout << "Adviser: " << s1.getAdviser() << endl;
	cout << endl;

	Student s2("James Pete", "s0222", "Marketing", p1);
	cout << "Student: " << s2.getName() << endl;
	cout << "ID: " << s2.getStudentID() << endl;
	cout << "Major: " << s2.getMajor() << endl;
	cout << "Adviser: " << s2.getAdviser() << endl;
	cout << endl;

	Student s3("Jane Eyre", "s0333", "Accounting", p2);
	cout << "Student: " << s3.getName() << endl;
	cout << "ID: " << s3.getStudentID() << endl;
	cout << "Major: " << s3.getMajor() << endl;
	cout << "Adviser: " << s3.getAdviser() << endl;
	cout << endl;

	Student s4("Charlotte Bronte", "s0444", "CIS", p2);
	cout << "Student: " << s4.getName() << endl;
	cout << "ID: " << s4.getStudentID() << endl;
	cout << "Major: " << s4.getMajor() << endl;
	cout << "Adviser: " << s4.getAdviser() << endl;
	cout << endl;

	Student s5("George Owell", "s0555", "CIS", p2);
	cout << "Student: " << s5.getName() << endl;
	cout << "ID: " << s5.getStudentID() << endl;
	cout << "Major: " << s5.getMajor() << endl;
	cout << "Adviser: " << s5.getAdviser() << endl;


	return 0;
}

	//Person function definitions
	void Person::setName(string name) 
	{ 
		this->name = name;
	}

	string Person::getName()
	{
		return name;
	}

	Person::Person(string name)
	{
		this->name = name;
	}
	
	Person::Person()
	{}

	//Professor function definitions
	void Professor::setEmployeeID(string employeedID)
	{
		this->employeeID = employeeID;
	}

	string Professor::getEmployeeID()
	{
		return employeeID;
	}

	void Professor::setOfficeNo(string officeNo)
	{
		this->officeNo = officeNo;
	}

	string Professor::getOfficeNo()
	{
		return officeNo;
	}

	void Professor::setOfficePhone(string officePhone)
	{
		this->officePhone = officePhone;
	}

	string Professor::getOfficePhone()
	{
		return officePhone;
	}

	Professor::Professor(string name,string employeeID, string officeNo, string officePhone)
		:Person(name) ,employeeID(employeeID), officeNo(officeNo), officePhone(officePhone)
	{

	}

	//Student function definitions
	void Student::setStudentID(string studentID)
	{
		this->studentID = studentID;
	}

	string Student::getStudentID()
	{
		return studentID;
	}

	void Student::setMajor(string major)
	{
		this->major = major;
	}

	string Student::getMajor()
	{
		return major;
	}

	Student::Student(string name, string studentID, string major, Professor adviser)
		:Person(name), studentID(studentID), major(major), adviser(adviser)
	{
	}

	void Student::setAdviser(Professor adviser)
	{
		this->adviser = adviser;
	}

	string Student::getAdviser()
	{
		return adviser.getName();
	}