#include <graphics.h>
char * grapherrormsg(int errorcode);
 

grapherrormsg returns a pointer to the error message string associated
with errorcode, the value returned by graphresult.
Refer to the entry for errno in the Library Reference, Chapter 4, for a
list of error messages and mnemonics.

/* grapherrormsg example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
#define NONSENSE -50
 
int main(void)
{
   /* force an error to occur */
   int gdriver = NONSENSE, gmode, errorcode;
 
   /* initialize graphics mode */
   initgraph(&gdriver, &gmode, "");
 
   /* read result of initialization */
   errorcode = graphresult();
 
   /* if an error occurred, then output descriptive error message*/
   if (errorcode != grOk) {
printf("Graphics error: %s\n", grapherrormsg(errorcode));
 
printf("Press any key to halt:");
getch();
exit(1);   /* terminate with an error code */
   }
 
 
   /* draw a line */
   line(0, 0, getmaxx(), getmaxy());
 
   /* clean up */
   getch();
   closegraph();
   return 0;
}

graphresult

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