Bouncing Balls

A simple simple ball which is bouncing....

#include dos.h
#include iostream.h
#include graphics.h
#include math.h
#include conio.h
void main()
{

int d=DETECT,m;
initgraph(&d,&m,"e:\tcc\bgi");
float x=1,y=0.00000,j=.5,count=.1;
float r=15;
setcolor(14);
line(0,215,650,215);
sleep(1);
for(int k=0;k<=7;k++)
{

for(float i=90;i<270;i+=10)
{
y=cos(((i*22/7)/180))/j;

if(y>0)
y=-y;
x+=5;

setcolor(14);
setfillstyle(1,14);
circle(x,y*100+200,r);
floodfill(x,y*100+200,14);

delay(100);

setcolor(0);
setfillstyle(1,0);
circle(x,y*100+200,r);
floodfill(x,y*100+200,0);

}

j+=count;
count+=.1;

}
getch();
}