allegro_message - Used mainly to show error messages to users. Allegro game programming library.

       Outputs a message, using a printf() format string. Usually you want to use this to report messages to the
       user  in  an  OS  independent way when some Allegro subsystem cannot be initialised. But you must not use
       this  function  if  you  are  in  a  graphic  mode,  only  before  calling  set_gfx_mode(),  or  after  a
       set_gfx_mode(GFX_TEXT).  Also, this function depends on a system driver being installed, which means that
       it won't display the message at all on some platforms if Allegro has not been initialised correctly.

       On platforms featuring a windowing system, it will bring up a blocking GUI message box. If  there  is  no
       windowing  system,  it will try to print the string to a text console, attempting to work around codepage
       differences by reducing any accented characters to 7-bit ASCII approximations.  Example:

          if (allegro_init() != 0)
             exit(1);

          if (init_my_data() != 0) {
             allegro_message("Sorry, missing game data!\n");
             exit(2);
          }

       allegro_message - Used mainly to show error messages to users. Allegro game programming library.

allegro_init(3alleg4), install_allegro(3alleg4), set_uformat(3alleg4)

Allegro                                           version 4.4.3                         allegro_message(3alleg4)

#include<allegro.h>voidallegro_message(constchar*text_format,...);