4 For which of the following classes do we need to implement the big three, i.e., copy constructor, destructor, and overload assignment operator? Explain briey why. Note that all member variables for the class is listed, but member functions are omitted.

(a) class Student

class Student { // used for student

public:

...

private:

string name;

Date birthday;

};

(b) class AbsenceDates

class AbsenceDates { // used to keep track absence dates for a student...

public:

..

private:

Date * ptrDateArray; // points to an array of Date

int length; // the capacity of array that ptrDateArray points to

};

(c) class HomeworkGrades

class HomeworkGrades

{

public:

...

private:

double grades[10];

int length; //number of grades entered into the array grades

};