class Seiseki{
private:
  int num, jap, math, eng;

public:
  Seiseki();
  Seiseki(int num, int jap, int math, int eng);
  Seiseki(int num);
  ~Seiseki();

  void setNum(int num);
  void setJap(int jap);
  void setMath(int math);
  void setEng(int eng);

  int getNum();
  int getJap();
  int getMath();
  int getEng();

  double getAverage();

};