How can you tell if the input buffer is empty?

This is a discussion on How can you tell if the input buffer is empty? within the C Programming forums, part of the General Programming Boards category; Code: if (getch() != EOF) getch(); Basically if the buffer is empty, then good, but if it's not then I ...

  1. #1
    Registered User
    Join Date
    May 2003
    Posts
    15

    How can you tell if the input buffer is empty?

    Code:
    	if (getch() != EOF)
    		getch();
    Basically if the buffer is empty, then good, but if it's not then I want to do the getch() (there would only be 1 thing in the buffer so this would work perfectly)

    Any ideas?

  2. #2
    Registered User
    Join Date
    Jan 2003
    Posts
    648
    If you're using VC++: int _kbhit(void); in <conio.h>. It return non-zero if a key was pressed.

    Here's an example right from the docs:
    Code:
    /* KBHIT.C: This program loops until the user
     * presses a key. If _kbhit returns nonzero, a
     * keystroke is waiting in the buffer. The program
     * can call _getch or _getche to get the keystroke.
     */
    
    #include <conio.h>
    #include <stdio.h>
    
    void main( void )
    {
       /* Display message until key is pressed. */
       while( !_kbhit() )
          _cputs( "Hit me!! " );
    
       /* Use _getch to throw key away. */
       printf( "\nKey struck was '%c'\n", _getch() );
       _getch();
    }

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