Trouble with using parent constructors - c++

Question

I'm currently working on an assignment to expand on a program we previously made, involving the use of header files, and parent classes. In the original, I have 2 header files. Person.h, and OCCCDate.h. In the new one, I am creating one called OCCCPerson.h. It's an incredibly simple class that basically just uses Person, just with 1 added variable.
My problem is, I cant figure out how to use the parent constructor properly.
Here is the Person.h file.
#ifndef PERSON_H
#define PERSON_H
#include <string>
#include "OCCCDate.h"
using namespace std;
class Person{
private:
string firstName;
string lastName;
OCCCDate dob;
public:
Person();
Person(string, string);
Person(string, string, OCCCDate);
string getFirstName();
string getLastName();
void setFirstName(string);
void setLastName(string);
int getAgeInYears();
bool equals(Person);
string toString();
};
#endif
And here is my OCCCPerson.h file
#ifndef OCCCPERSON_H
#define OCCCPERSON_H
#include <string>
#include "OCCCDate.h"
#include "Perosn.h"
using namespace std;
class OCCCPerson : Person{
protected:
string studentID;
public:
OCCCPerson(string firstName, string lastName, OCCCDate dob, string studentID);
OCCCPerson(Person p, string studentID);
string getStudentID();
bool equals(OCCCPerson p);
string toString();
};
#endif;
I cant seem to call on the parents constructor to get things like the firstname, lastname, and dob(date of birth). From my handout, it says the parent constructor has to be initialized with, : Person(parameters), where parameters are things in the parent class. However, I have no idea where to put that. Sorry for writing so much. I just couldn't figure out how to shrink that down.
Oh, and here is OCCCDate.h just in case
#ifndef OCCCDATE_H
#define OCCCDATE_H
#include<string>
using namespace std;
class OCCCDate{
private:
bool OCCCDate_US;
bool OCCCDate_EURO;
int dayOfMonth, monthOfYear, year;
bool dateFormat;
public:
OCCCDate();
OCCCDate(int dayOfMonth, int monthOfYear, int year);
int getDayOfMonth();
int getMonth();
string getNameOfMonth();
int getYear();
string getDate();
int getDifference(OCCCDate d1, OCCCDate d2);
int getDifference(OCCCDate d1);
void setDateFormat(bool);
bool equals(OCCCDate d);
string toString();
};
#endif
And here is my OCCCDate.cpp file
#include<iostream>
#include<ctime>
#include "OCCCPerson.h"
using namespace std;
OCCCPerson::OCCCPerson(string firstName, string lastName, OCCCDate dob, string studentID):Person(firstName, lastName, dob){
string firstName = Person::getFirstName();
string lastName = Person::getLastName();
OCCCDate dob = dob;
this->studentID = studentID;
}
OCCCPerson::OCCCPerson(Person p, string studentID){
Person p = p;
this->studentID = studentID;
}

Answer 1

What you need is member initializer lists.
From cppreference:
In the definition of a constructor of a class, member initializer list specifies the initializers for direct and virtual base subobjects and non-static data members.
A simple example:
class MyClass : BaseClass
{
public:
MyClass(int arg) : BaseClass(arg) {
//Rest of code
}
}
In your case, you can do:
OCCCPerson(string firstName, string lastName, OCCCDate dob, string studentID) :
Person(firstName, lastName, dob) {
this.studentID = studentID;
}

Answer 2

In OCCCPerson.cpp,
OCCCPerson(string firstName, string lastName, OCCCDate dob, string
studentID) : Person(firstName, lastName, dob)
{
//more stuff
}
You basically have to use an initializer list.
Read more here: What are the rules for calling the superclass constructor?
What this does is it calls the parent constructor Person(string, string, OCCCDate) and basically performs this->firstName = firstName. Similarly for lastName and dob. But not studentID because the Person(string, string, OCCCDate) constructor doesn't provide initialization for studentID.