Bios Clock

#define PI 3.14152692
void second_hand(int midx,int midy,int d);
void min_hand(int midx,int midy,int d);
void hour_hand(int midx, int midy,int d);
int xc, yc, radius=150, charsize=2,d;  //radius of the circle
char buffer[80];
void digitxy(int d);
 int midx, midy;
void mainpage(void);
  struct time t;

int main(void)
{
  int gdriver = DETECT, gmode, errorcode,color;
  initgraph(&gdriver, &gmode, "c:\\bc5\\bgi");
  errorcode = graphresult();
  if (errorcode != grOk)
  {
  printf("Graphics error: %s\n", grapherrormsg(errorcode));
  printf("Press any key to halt:");
  getch();
  exit(1);
  }
  midx = getmaxx() / 2;
  midy = getmaxy() / 2;
  xc=midx;
  yc=midy;

  circle(midx, midy, radius);
  for(d=5;d<=60;d+=5)
   digitxy(d);
  do{

   gettime(&t);
   second_hand(midx,midy,t.ti_sec);
   min_hand(midx,midy,t.ti_min);
   hour_hand(midx,midy,t.ti_hour);
 	 delay(1000);
   floodfill(midx,midy,15);
  }while(!kbhit());
  getch();
  closegraph();
}
void digitxy(int d)
{
  int dx = (int) (cos((d/60.0)*2.*PI-PI/2.)*140+xc);
  int dy = (int) (sin((d/60.0)*2.*PI-PI/2.)*140+yc);

	sprintf(buffer,"%d",d/5);
  outtextxy(dx,dy,buffer);
  setcolor(WHITE);

}
void second_hand(int midx,int midy,int d)
{
  int dx = (int) (cos((d/60.0)*2.*PI-PI/2.)*140+xc);
  int dy = (int) (sin((d/60.0)*2.*PI-PI/2.)*140+yc);
  if(dy - yc >= 0)
  	dy+=charsize;
  else
  	dy-=charsize/2;
  if(dx -xc >=0)
  	dx+=charsize/2;
  else
setfillstyle(1,4);
 dx-=charsize;
 moveto(midx,midy);
 lineto(dx,dy);
 setcolor(YELLOW);
}
void min_hand(int midx,int midy,int d)
{
  int dx = (int) (cos((d/60.0)*2.*PI-PI/2.)*120+xc);
  int dy = (int) (sin((d/60.0)*2.*PI-PI/2.)*120+yc);
  if(dy - yc >= 0)
  	dy+=charsize;
  else
  	dy-=charsize/2;
  if(dx -xc >=0)
  	dx+=charsize/2;
  else
setfillstyle(1,4);
 dx-=charsize;
 moveto(midx,midy);
 lineto(dx,dy);
 setcolor(BLUE);
}
void hour_hand(int midx, int midy,int d)
{
int dx = (int) (cos((d/60.0)*2.*PI-PI/2.)*100+xc);
  int dy = (int) (sin((d/60.0)*2.*PI-PI/2.)*100+yc);
  if(dy - yc >= 0)
  	dy+=charsize;
  else
  	dy-=charsize/2;
  if(dx -xc >=0)
  	dx+=charsize/2;
  else
setfillstyle(1,4);
 dx-=charsize;
 moveto(midx,midy);
 lineto(dx,dy);
 setcolor(GREEN);
}