wtfc

#include <iostream>
#include <bits/stdc++.h>
using namespace std;

int main()
{
    unsigned long long incorrect,power,correct;

    power = 7 * pow(10, 17); // 700000000000000000

    cout << "power     " << power << "." << endl;

    correct = 42105263157894736 + power; // outputs 742105263157894736

    cout << "correct   " << correct << "." << endl;

    incorrect = 42105263157894736 + (7 * pow(10, 17)); // outputs 742105263157894784

    //thisworks = 42105263157894736 + (7 * power);

    cout << "incorrect " << incorrect << "." << endl;

    return 0;
}