Exiting loop by keystroke without waiting for input

Question

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.

Either set your loop condition to false or consider https://en.cppreference.com/w/cpp/language/break — TheUndeadFish, Dec 09 '20 at 20:55
***somehow but the only way I can think of would be to ask for user input*** You may want some OS api for that if you want to have it exit the loop when the user presses the space bar or something. Related: [https://stackoverflow.com/questions/421860/capture-characters-from-standard-input-without-waiting-for-enter-to-be-pressed](https://stackoverflow.com/questions/421860/capture-characters-from-standard-input-without-waiting-for-enter-to-be-pressed) — drescherjm, Dec 09 '20 at 21:14
Since your on Windows, you can use [`_kbhit`](https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/kbhit?view=msvc-160). — Paul Sanders, Dec 09 '20 at 21:18
This program is a stopwatch, I need to end the loop upon user input, I tried kbhit and getch but they didn't work can you show me how that would be done? — Kareem Fareed, Dec 09 '20 at 22:25

score 0 · Accepted Answer · answered Dec 09 '20 at 23:45

bool stop = false;
int hours = 0;
int minutes = 0;
int seconds = 0;
while (!_kbhit())
{
    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;
    }
}

Exiting loop by keystroke without waiting for input

1 Answers1