#include <graphics.h>
char *getdrivername(void);
 

After a call to initgraph, getdrivername returns the name of the driver
that is currently loaded.

/* getdrivername example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
int main()
{
   /* request autodetection */
   int gdriver = DETECT, gmode, errorcode;
 
   /* stores the device driver name */
   char *drivername;
 
   /* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");
 
   /* read result of initialization */
   errorcode = graphresult();
   if (errorcode != grOk) { /* an error occurred */
printf("Graphics error: %s\n", grapherrormsg(errorcode));
 
printf("Press any key to halt:");
getch();
exit(1);   /* terminate with an error code */
   }
   setcolor(getmaxcolor());
 
   /* get the name of the device driver in use */
   drivername = getdrivername();
 
   /* for centering text onscreen */
   settextjustify(CENTER_TEXT, CENTER_TEXT);
 
   /* output the name of the driver */
   outtextxy(getmaxx() / 2, getmaxy() / 2, drivername);
 
   /* clean up */
   getch();
   closegraph();
 
   return 0;
}

initgraph

  no output of example at the moment
  do not hesitate and add it...