Student class moved to separate .h and .cpp files. See video at https://youtu.be/gyA7uDlazkc.

main.cpp

#include "Student.h"
#include <iostream>

using namespace std;

int main() {
    Student s1 {"Cecelia", 3.8 };
    Student s2 {"Sam", 3.1};

    cout << s1 << endl;
    cout << s2 << endl;
}

Student.cpp

#include "Student.h"

using namespace std;

Student::Student(string theName, double theGpa) : name(theName), gpa(-1) {
    set_gpa(theGpa);
}

// accessor
string Student::get_name() const {
    return name;
}

// mutator
void Student::set_gpa(double newGpa) {
    if (newGpa >= 0 && newGpa <= 4.0) {
        gpa = newGpa;
    }
}

ostream& operator<<(ostream& ostr, const Student& stud) {
    ostr << stud.get_name() << ", " << stud.gpa;
    return ostr;
}

Student.h

#ifndef STUDENTDB_STUDENT_H
#define STUDENTDB_STUDENT_H

#include <string>
#include <iostream>

using namespace std;

class Student {
//private:
    string name;
    double gpa;

public:
    Student(string theName, double theGpa);

    // accessor
    string get_name() const;

    // mutator
    void set_gpa(double newGpa);

    friend ostream& operator<<(ostream& ostr, const Student& stud);
};

ostream& operator<<(ostream& ostr, const Student& stud);

#endif //STUDENTDB_STUDENT_H

Thank you so much for explaining everything to an old man of 55 who just likes to learn. My body is worn but i am trying to keep my mind working. Again thank you for your videos and God Bless You!

Thank you, great video and explanation.

are we only uses classes in header file or we can use also functions?