void ginit()
{
    /* request auto detection */
    int gdriver = DETECT, gmode, errorcode;

    /* initialize graphics mode */
    initgraph(&gdriver, &gmode, "c:\\tc\\bgi");

    /* 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);             /* return with error code */
    }
}