Question

This problem really perturbs me on how to do it in C way:

Display series of numbers (1,2,3,4, 5….etc) in an infinite loop. The program should quit if someone hits a specific key (Say Backspace key).

My try was to make a loop and then get the user input every time.

int main()
{
    char userInput;
    int i = 0;

    while(true)
    {
       Sleep(1000);
       printf("%d", ++i);
       userInput = getch();
       fflush(stdin);

       if (userInput == '\b'){
        break;   
       }           
    }

    getch();
    return 0;

}

But this is not the answer the problem is looking for. It does want to continue printing numbers while checking the user input.

Anyone could help a newbie with this? Thanks! 😀

Update:
Mr.Mark Wilkins just gave me the answer by using the _kbhit() function.
And this was what my solution looked like:

int main()
{
    int i = 0;
    char userInput;

    while( !_kbhit() && userInput != '\b' )
    {
       Sleep(500);
       printf("%d", ++i);    
    }

    getche();

    getch();
    return 0;

}

Answer 1

You can call _kbhit to check if input is waiting. If there is, then you can read it with _getch.