Exiting loop without stopping C++

bool stop = false;
    int hours = 0;
    int minutes = 0;
    int seconds = 0;
    while (stop == false)
    {
        system("cls");
        cout << "Hours     Minutes     Seconds\n";
        cout << hours << "          " << minutes << "          " << seconds << endl;
        Sleep(1000);
        seconds++;
        if (seconds == 60)
        {
            minutes++;
            if (minutes == 60)
            {
                hours++;
                minutes = 0;
            }
            seconds = 0;
        }
    }

I want to exit the while loop somehow but the only way I can think of would be to ask for user input, but I can't do this because it would mess up the stopwatch.