#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<stdlib.h>
void main()
{
  int gd=0,gm;
  int r,x,y,p,xc,yc;
  clrscr();
// detectgraph(&gd,&gm);
  initgraph(&gd,&gm,"\\TC\\BGI");
  printf("enter the center points xc,yc,r");
  scanf("\n \n \n %d %d %d",&xc,&yc,&r);
  printf(" radius %d ",r);
  x=0;
  y=r;
  plotpoints(x,y,xc,yc);
  p=1-r;
  while (x < y)
   {
     if (p < 0)
     {
     x=x+1;
     p=p+(2*x)+1;
     }
     else
      {
     x=x+1;
     y=y-1;
       p=p+2*(x-y)+1;
       }
     plotpoints(x,y,xc,yc);
  }
	getch();
	closegraph();
  }
      plotpoints(int x,int y,int xc,int yc)
      {
	putpixel(xc+x,yc+y,10);
	putpixel(xc-x,yc+y,10);
	putpixel(xc+x,yc-y,10);
	putpixel(xc-x,yc-y,10);
	putpixel(xc+y,yc+x,10);
	putpixel(xc-y,yc+x,10);
	putpixel(xc+y,yc-x,10);
	putpixel(xc-y,yc-x,10);
      return 0;
      }