This is a discussion on Timers within the C++ Programming forums, part of the General Programming Boards category; i want to define a 5 secound period where the user will input numerical data from the keypad.while that it ...

  1. #1
    Registered User Ajsan's Avatar
    Join Date
    Dec 2003


    i want to define a 5 secound period where the user will input numerical data from the keypad.while that it happening i want the timer on the screen to count down in tenths of secounds and when it reched an incorrect key stroke or the end of time or the max input it stops and calls functions bases on the numberical enterd data

    how can i get the timer to count down?

    i know kbhit and getch so that isn't a problem?

    how do i structer that that for/while loop to accomplish the above?

    any suggestion and answers are apreciated.
    Style is overrated.

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  2. #2
    Been here, done that.
    Join Date
    May 2003
    The answer is system and compiler dependant. Whatcha using?
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  3. #3
    Registered User Ajsan's Avatar
    Join Date
    Dec 2003
    i'm using VC++ 6.0 Pro and if it matters Windows 9X.
    Style is overrated.

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  4. #4
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    Q&D hackery
    for ( timer = 50 ; timer >= 0 ; timer-- ) {
      // print decreasing amount of time
      if ( kbhit() ) {
        // read one key
        // check for completion
        // break on completion
      sleep for 1/10th second
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  5. #5
    Hardware Engineer
    Join Date
    Sep 2001
    Just make a fast loop that doesn't "do anything" until an "important event" happens.

    Every time through the loop, check to see how much time has elapsed. It it time to update the tenths-of-a-second display? And, check to see if the user entered anything. Did the user make the correct entry?

    I'd probably use the timer as my main end-loop condition:
    i.e. while(Time < 5 sec)
    Then "break;" depending on the user's input.

    When you get it working, you should probably experiment with some delay/pause in the loop... maybe a few milliseconds... to free-up some CPU cycles and allow your multitasking operating system to do something else. (Actually, your program can get interrupted by the OS even if you don't pause.) Short-duration timing is always tricky with a multitasking OS.

  6. #6
    Registered User manofsteel972's Avatar
    Join Date
    Mar 2004
    if you writing a windows application you can use the win32 api function GetTickCount() function it returns the number of milliseconds

    double timer=5;
       DWORD starttime=GetTickCount();
       //do code or whatever
       if((GetTickCount()-starttime<100)   //difference in milliseconds
    if you are using a winproc to handle timer messages you can use
    in WM_CREATE maybe do this
    and in WIN_PROC
    case WM_TIMER:
                       case TIMER_ID_1TENTH:
                                //do processing here
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  7. #7
    Registered User Ajsan's Avatar
    Join Date
    Dec 2003
    Thank you all for the help. i have realized that i'm an idiot and could have figuired it out if i had taken about another minute to think about it.
    Style is overrated.

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