// Student - define the properties of a Student
class Student
{
  public:
    virtual double calcTuition()
    {
        return 0;
    }

  protected:
    int nID;
};
class GraduateStudent : public Student
{
  public:
    virtual double calcTuition()
    {
        return 1;
    }

  protected:
    int nGradId;
};