[C++]성적 처리 포함 오브젝트

#include <iostream>
#include <string>
using namespace std;
 
class Name {
 string name;
public :
 void setN(string name) {
  this->name = name;
 }
 string getN() {
  return name;
 }
};
class subject {
 int KorScore;
 int MathScore;
 int EngScore;
public:
 void setSK(int KorScore) {
  this -> KorScore = KorScore;
 }
 int getSK() {
  return KorScore;
 }
 void setSM(int MathScore) {
  this->MathScore = MathScore;
 }
 int getSM() {
  return MathScore;
 }
 void setSE(int EngScore) {
  this->EngScore = EngScore;
 }
 int getSE() {
  return EngScore;
 }
};
class subjectManager {
 Name nn;
 subject ss;
 string name;
 int KorScore;
 int MathScore;
 int EngScore;
 int sum;
 float avr;
public:
 void setN(string name) {
  nn.setN(name);
 }
 string getN() {
  return nn.getN();
 }
 void setSK(int KorScore) {
  ss.setSK(KorScore);
 }
 int getSK() {
  return ss.getSK();
 }
 void setSM(int MathScore) {
  ss.setSM(MathScore);
 }
 int getSM() {
  return ss.getSM();
 }
 void setSE(int EngScore) {
  ss.setSE(EngScore);
 }
 int getSE() {
  return ss.getSE();
 }
 void setScore(int sum) {
  this->sum = sum;
 }
 int getScore() {
  sum = ss.getSE() + ss.getSK() + ss.getSM();
  return sum;
 }
 float getAvr(float avr) {
  this->avr = avr;
 }
 float getAvr() {
  avr = sum / 3;
  return avr;
 }
};
 
void main() {
 int num;
 string name;
 int i;
 int KorScore;
 int MathScore;
 int EngScore;
 cout << "몇 명" << endl;
 cin >> num;
 
 subjectManager *sm = new subjectManager[num];
 
 for ( i = 0; i < num; i++)
 {
  cout << "이름" << endl;
  cin >> name;
  sm[i].setN(name);
  cout << "국어" << endl;
  cin >> KorScore;
  sm[i].setSK(KorScore);
  cout << "수학" << endl;
  cin >> MathScore;
  sm[i].setSM(MathScore);
  cout << "영어" << endl;
  cin >> EngScore;
  sm[i].setSE(EngScore);
 }
 
 for ( i = 0; i < num; i++)
 {
  cout << "이름 :" << sm[i].getN() << endl;
  cout << "국어 :" << sm[i].getSK() << endl;
  cout << "수학 :" << sm[i].getSM() << endl;
  cout << "영어 :" << sm[i].getSE() << endl;
  cout << "총점 :" << sm[i].getScore() << endl;
  cout << "평균 :" << sm[i].getAvr() << endl;
 
 }
 delete sm;
}