Constructor and destructor example

main.cpp

#include <iostream>
#include <iomanip>

using namespace std;

class Student {

private:
    char name[51];
    char surname[51];
    int *marks;
    int marks_counter;
    int hp;  // очки здоровья персонажа
    int energy;
    void change_field(int &field, int delta);


public:
    bool is_alive();
    void show();
    void eat();
    void wait();
    void setMark(int mark);
    Student(); // Конструктор 
    Student(int hp,int energy=100);
    ~Student(); // Деструктор
};

// Конструктор по умолчанию(без параметров)
Student::Student() {
    cin >> this->name >> this->surname;
    this->hp = 100;
    this->energy = 100;
    this->marks_counter = 0;
    this->marks = new int[100];
}

Student::Student(int hp, int energy) {
    cin >> this->name >> this->surname;
    this->hp = hp;
    this->energy = energy;
    this->marks_counter = 0;
    this->marks = new int[100];
}

Student::~Student() {
    delete [] this->marks;
}



void Student::change_field(int &field, int delta) {
    field += delta;
    if (field > 100) {
        field = 100;
    }
    if (field < 0) {
        field = 0;
    }
}

bool Student::is_alive() {
    return this->hp > 0;
}





void Student::show() {
    cout << this->name << " " << this->surname << ": ";
    // setw(3) -- не менее 3 знаков в выводе
    // setfill('0') -- если знаков меньше 3, добавить ноль слева
    cout << "HP = " << setw(3) << setfill('0') << hp << ", ";
    cout << "Energy = " << setw(3) << setfill('0') << energy << ". ";
    if (!is_alive()) {
        cout << "Game over.";
    }
    cout << endl;
    cout << "Marks: ";
    for (int i = 0; i < this->marks_counter;i++) {
        cout << this->marks[i] << " ";
    }
    cout << endl;
}

void Student::eat() {
    if (is_alive()) {
        change_field(energy,7);
        change_field(hp,1);
    }

}

void Student::wait() {
    if (is_alive()) {
        change_field(energy,-3);
        change_field(hp,1);
    }
}

void Student::setMark(int mark) {
    this->marks[this->marks_counter] = mark;
    this->marks_counter++;
}


int main() {
    Student *s = new Student(100,100);
    
    Student k(5,50);
    k.show();
    
    s->setMark(3);
    s->setMark(5);
    s->show();
    delete s;
    return 0;

}