Exercise 2/26

#include <iostream>
#include <string>
using namespace std;
struct Grades {
    int grade1;
    int grade2;
    int grade3;
};

class Student {
public:
    Student(string n = " ", int g1 = 0, int g2 = 0, int g3 = 0); // overloaded
    Student(const Student &obj); // copy constructor
    Student & operator=(const Student &obj); //assignment operator
    friend ostream & operator << (ostream & out, const Student &obj);
    ~Student(); // destructor

private:
    string name;
    Grades *ptr;
};

// Member functions definitions
Student::Student(string n, int g1, int g2, int g3) {
    cout << "Overloaded constructor." << endl;

    // ptr points at a struct called Grades
    name = n;
    ptr = new Grades;
    ptr->grade1 = g1;
    ptr->grade2 = g2;
    ptr->grade3 = g3;

}

Student::Student(const Student &obj) {
    cout << "Copy constructor." << endl;
    ptr = new Grades;
    ptr->grade1 = obj.ptr->grade1;
    ptr->grade2 = obj.ptr->grade2;
    ptr->grade3 = obj.ptr->grade3;

}

Student::~Student() {
    cout << "Freeing memory!" << endl;
    delete[] ptr;
    ptr = nullptr;
}


Student& Student::operator= (const Student &obj) {
    cout << "Assignment operator." << endl;
    if (this != &obj) {
        delete ptr;
        ptr = new Grades;
        ptr->grade1 = obj.ptr->grade1;
        ptr->grade2 = obj.ptr->grade2;
        ptr->grade3 = obj.ptr->grade3;
    }
    return *this;
}
ostream & operator << (ostream & out, const Student & obj) {
    out << obj.name << " ";
    out << obj.ptr->grade1 << " ";
    out << obj.ptr->grade2 << " ";
    out << obj.ptr->grade3 << " " << endl;
    return out;
}

// Main function for the program
int main() {

    Student s1("BOB", 98, 78, 95);
    cout << s1;
    Student s2;
    s2 = s1;
    Student s3 = s2;


}