Random filled ellipse in CG

#include <stdlib.h>
#include<graphics.h>
#include <stdio.h>
void main()
{
   int gd=DETECT,gm,i;
   initgraph(&gd,&gm,"C:\\TurboC3\\BGI");

   for(i=1;i<=500;i++)
   {
    putpixel(rand()%500,rand()%500,rand()%500);
    setfillstyle(rand()%15,rand()%15);
    setcolor(rand()%10);
    fillellipse(rand()%500,rand()%500,15,15);
    delay(100);
   }
   getch();
   closegraph();
}