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

void main()
{
int gd=DETECT,gm;
int r,x,y,p,xc=320,yc=240;

initgraph(&gd,&gm,"C:\\TC\\BGI");
cleardevice();


printf("Enter the radius ");
scanf("%d",&r);


x=0;
y=r;
putpixel(xc x,yc-y,1);

p=3-(2*r);

for(x=0;x<=y;x )
{
if (p<0)
{
y=y;
p=(p (4*x) 6);
}
else
{
y=y-1;

p=p ((4*(x-y) 10));
}

putpixel(xc x,yc-y,1);
putpixel(xc-x,yc-y,2);
putpixel(xc x,yc y,3);
putpixel(xc-x,yc y,4);
putpixel(xc y,yc-x,5);
putpixel(xc-y,yc-x,6);
putpixel(xc y,yc x,7);
putpixel(xc-y,yc x,8);

}
getch();
closegraph();
}