Демонический массив

#include <iostream>
#include <vector>

using namespace std;

class demon{
private:
    bool status;
    int HP;
    int DMG;
    int DDG;
    int DEF;
public:
    demon(){
        status = true;
        cout << "This demon is REAL!!!" << endl;
    }
    void input_data();
    void show_data();
    void die();
    void ressurection();
};

void demon::input_data(){
    cout << "Enter HP your demon: ";
    cin >> this->HP;
    cout << "Enter DMG your demon: ";
    cin >> this->DMG;
    cout << "Enter DDG your demon: ";
    cin >> this->DDG;
    cout << "Enter DEF your demon: ";
    cin >> this->DEF;
}

void demon::show_data(){
    cout << "HP your demon: " << this->HP << endl;
    cout << "DMG your demon: " << this->DMG << endl;
    cout << "DDG your demon: " << this->DDG << endl;
    cout << "DEF your demon: " << this->DEF << endl;
}

void demon::die(){
    if (this->HP == 0){
        this->status = false;
        cout << "Pomerla sila nechistaya!" << endl;
    }
}

void demon::ressurection(){

}

int main(){
    vector<demon> demons;
    int a;
    demon lox;
    do{
        cin >> a;
        switch (a){
        case 1: lox.input_data();
            demons.push_back(lox);
            break;
        case 2: int b;
            cout << "Enter id your demon's: ";
            cin >> b;
            if (b > demons.size()){
                cout << "You debil!!!";
                break;
            }
            demons[b]
        }
    } while (a != 0)
    system("pause");
    return 0;
}