keypressed - Tells if there are keypresses waiting in the input buffer. Allegro game programming library.

       Returns  TRUE  if  there  are keypresses waiting in the input buffer. You can use this to see if the next
       call to readkey() is going to block or to simply wait for the user to press a key while you still  update
       the screen possibly drawing some animation. Example:

          while (!keypressed()) {
             /* Show cool animated logo. */
          }
          /* So he skipped our title screen. */

       keypressed - Tells if there are keypresses waiting in the input buffer. Allegro game programming library.

install_keyboard(3alleg4),        readkey(3alleg4),       ureadkey(3alleg4),       clear_keybuf(3alleg4),
       simulate_keypress(3alleg4), simulate_ukeypress(3alleg4)

Allegro                                           version 4.4.3                              keypressed(3alleg4)

#include<allegro.h>intkeypressed();