#include <iostream>
#include <string>
using namespace std;
class stInfo {
private:
 string stNum;
 string stName;
 int stAge;
 int bonus;
public:
 stInfo(string a = "B777777", string b = "김이름", int c = 20);

 ~stInfo();
 void stPrnt(stInfo &s)
 {

  cout << "학번:" << stNum << "  이름:" << stName << "  나이:" << stAge << endl;
 }
 void bonusplus(int k) {
  bonus = 0;
  bonus += k;
 }
 void bonussub(int k) {
  bonus = 0;
  bonus -= k;
 }
 void showbonus(int bonus) {
  cout << "보너스 점수:" << bonus << endl;
 }
};

stInfo::stInfo(string a, string b, int c) {
 stNum = a;
 stName = b;
 stAge = c;
}
stInfo::~stInfo() {
 cout << "학번" << stNum << "  이름" << stName << "  나이" << stAge << "학생 소멸" << endl;
}

int main() {
 stInfo student1("B511001", "김철수", 23);
 stInfo student2("B611002", "김영희", 26);
 stInfo student3("B411003", "김영수", 24);
 stInfo student4;
 student1.stPrnt(student1);
 student2.stPrnt(student2);
 student3.stPrnt(student3);
 student4.stPrnt(student4);

 student1.bonusplus(5);
 student2.showbonus;
 student3.bonusplus(3);
 student4.showbonus;
 student4.bonussub(2);
 student1.showbonus;

 return 0;
}