55. Total Average of Students C++

#include <iostream>
#include <string>
#include <vector>

using namespace std;

class Student
{
public:
    Student(string fname, string lname, double gpa) :
        first_name(fname), last_name(lname), GPA(gpa)
    {}

    void print() const
    {
        cout << first_name << ' ' << last_name << ' ' << GPA << endl;
    }

    double get_gpa() const
    {
        return GPA;
    }

private:
    string first_name;
    string last_name;
    double GPA;
};

vector<Student> read_student_info(size_t n)
{
    vector<Student> students;
    for (size_t i = 0; i < n; ++i)
    {
        string fname, lname;
        double gpa;
        cin >> fname >> lname >> gpa;
        Student student(fname, lname, gpa);
        students.push_back(student);
    }

    return students;
}

double calc_total_gpa(const vector<Student>& students)
{
    if (students.empty())
        return 0;

    double sum = 0;
    for (auto& student : students)
        sum += student.get_gpa();

    return sum / students.size();
}

int main()
{
    size_t n;
    cin >> n;

    vector<Student> students = read_student_info(n);

    for (auto& student : students)
        student.print();

    cout << static_cast<int>(calc_total_gpa(students)) << endl;

    return 0;
}