#include  <math.h>
#include<dos.h>
#include<stdio.h>
#include  <graphics.h>
#include<conio.h>

void main(void)
{
    int   driver = DETECT,mode;
    int   i,j,count=0;
    int x=1,y=1;
    initgraph(&driver,&mode,"a:\\bgi");
  //  d:\\BC31\\bgi");

      setcolor(WHITE);
      line(1,400,400,400);
    for ( i = 0; i < 80; i++ )
     {

	  // setcolor(BLACK);
	  // circle(400-x,400-y,2);
	   x=5*i;
	   y=9*i-0.15*i*i;
	   setcolor(RED);
	   circle(400-x,400-y,2);
	   delay(300);

	   if(count>=10) {
	      setcolor(BLACK);
	      circle(400-x,400-y,2);
	      x=5*i;
	      y=9*i-0.15*i*i;
	      setcolor(YELLOW);
	      circle(400-x,400-y,2);
	      delay(300);
	   }
	   count++;

	}

    closegraph();
}