Funciones a Objetos Visual C++

#include <cstdlib>
#include <iostream>

using namespace std;

class Student
{
public:
 int semesterHours;
 double gpa;
};

void someFn( Student copyS )
{
 copyS.semesterHours = 10;
 copyS.gpa = 3.0;
 cout << "El valor de copyS.gpa es: " << copyS.gpa << endl;
}

int main( int argc , char *argv[] )
{
 Student s;
 s.gpa = 0.0;

 //mostrar los valores antes de la funcion
 cout << "s.gpa: " << s.gpa << endl;

 cout << "Llamando a la funcion" << endl;

 someFn( s );

 cout << "Ahora regresa el valor" << endl;

 cout << "s.gpa: " << s.gpa << endl;

 system("pause");
 return 0;
}