程序代码：

// crt_kbhit.c
// compile with: /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>

int 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() );
}