machine world remake

#include <iostream>
#include <math.h>
#include <chrono>
using namespace std;
const int MAX_VALUE = 15;
class word{
    int values;
public:
    word(){
        int set = 0;
        for(int i = 0; i <= MAX_VALUE; i++)
        {
            if(rand() % 2 == 1)
                set |= (1 << i);
        }
        this->values=set;
    };
    word(int values){this->values=values;};

// --- --- ---
     void print_set()
    {
        cout << "{ ";
        for(int i = 0; i <= MAX_VALUE; i++)
        {
            if ((this->values & (1 << i)) != 0) // проверяем установлен ли i-й бит в маске
                cout << hex << i << " "; // выводим элемент в 16-ричной системе исчисления
        }
        cout << '}' << endl;
    }
// --- --- ---
    word operator && (const word& second) const
    {
        return word{values & second.values };
    }
// --- --- ---
    word operator || (const word& second) const
    {
        return word{values | second.values};
    }
// --- --- ---
    word operator - (const word& second) const
    {
        return word{values & ~second.values};
    }
};
int main() {
    srand(2);
    word a, b, c, d, e(0);
    cout<<"a:"; a.print_set();
    cout<<"b:"; b.print_set();
    cout<<"c:"; c.print_set();
    cout<<"d:"; d.print_set();
    double result;
    cout << endl << "*Calculating result*" << endl;
    for(int i = 0; i < pow(10, 7); i++)
    {
        auto t1 = chrono::high_resolution_clock::now();
        e = ((a||c)-(b||d));
        auto t2 = chrono::high_resolution_clock::now();
        auto diff = chrono::duration_cast<chrono::duration<double>>(t2 - t1);
        result += diff.count();
    }
    cout << endl << "E: "; e.print_set();
    cout << "time: " << result << " seconds" << endl;
    return 0;
}