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;


// This is the constructor. 
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