student code

#include <cstring>
#include <iostream>
#include <iomanip>

using namespace std;


class Student {
private:
    char name[51]{};
    char surname[51]{};
    int oldhp;
    int oldenergy;
    int oldiq;
    int oldsanity;
    int oldexcitement;
    void change_field(int& field, int delta)
    {
        field += delta;
        if (field > 100) {
            field = 100;
        }
        if (field < 0) {
            field = 0;
        }
    }
    void change_params(int hp, int energy, int iq, int sanity, int excitement) {
        change_field(oldhp, hp);
        change_field(oldenergy, energy);
        change_field(oldiq, iq);
        change_field(oldsanity, sanity);
        change_field(oldexcitement, excitement);
    }
public:
    Student() {
        cin >> name >> surname;
        oldhp = 100;
        oldenergy = 100;
        oldiq = 20;
        oldsanity = 100;
        oldexcitement = 50;
    }
    Student(char* name, char *surname) {
        oldhp = 100;
        oldenergy = 100;
        oldiq = 20;
        oldsanity = 100;
        oldexcitement = 50;
    }

    bool isAlive() {
        if (oldhp > 0) return true;
        else return false;
    }
    void show() {
        cout << name << " " << surname << ": HP = " << setw(3) << setfill('0') << hp
            << ", Energy = " << setw(3) << setfill('0') << energy
            << ", IQ = " << setw(3) << setfill('0') << iq
            << ", Sanity = " << setw(3) << setfill('0') << sanity
            << ", Excitement = " << setw(3) << setfill('0') << excitement << ".";
        if (!is_alive()) {
            cout << " Game over.";
        }
        cout << endl;
    }

    void eat() {
        if (!isAlive()) return;
        else change_params(1, 7, -1, 0, -2);
    }

    void wait() {
        if (!isAlive()) return;
        else change_params(1, -3, 0, 0, -3);
    }

    void study() {
        if (!isAlive()) return;
        else change_params(-2, -4, 5, -5, -2);
    }

    void sleep() {
        if (!isAlive()) return;
        else change_params(2,-2, 0, 7, 0);
    }

    void watchTV() {
        if (!isAlive()) return;
        else change_params(-2, -3, -3, 1, 5);
    }
};


int main() {
    Student student;

    int cmdCount;
    cin >> cmdCount;
    string cmd;
    for (int i = 0; i < cmdCount; i++) {
        cin >> cmd;
        if (cmd == "Eat") student.eat();
        else if (cmd == "Wait") student.wait();
        else if (cmd == "Study") student.study();
        else if (cmd == "Sleep") student.sleep();
        else if (cmd == "Watch TV") student.watchTV();
        student.show();
    }
    return 0;
}