VIRTUAL_W, VIRTUAL_H - Global define to obtain the virtual size of the screen. Allegro game programming

       Global defines that return the width and height of the virtual screen, or zero if the screen has not been
       initialised yet. Example:

          char buf[100];
          ...
          uszprintf(buf, sizeof(buf),
                    "The virtual screen size is %d x %d pixels",
                    SCREEN_W, SCREEN_H);

       VIRTUAL_W,  VIRTUAL_H  - Global define to obtain the virtual size of the screen. Allegro game programming
       library.

screen(3alleg4), set_gfx_mode(3alleg4), SCREEN_W(3alleg4), SCREEN_H(3alleg4)

Allegro                                           version 4.4.3                               VIRTUAL_W(3alleg4)

#include<allegro.h>#defineVIRTUAL_W;#defineVIRTUAL_H;