#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <graphics.h>
void common(int xc,int yc,int x, int y) {
  putpixel(xc+x,yc+y,2);  putpixel(xc-x,yc+y,3);
  putpixel(xc-x,yc-y,4);  putpixel(xc+x,yc-y,5);
  putpixel(xc+y,yc+x,6);  putpixel(xc-y,yc+x,7);
  putpixel(xc-y,yc-x,8);  putpixel(xc+y,yc-x,9);
}
void main() {
int    GraphDriver;             /* The Graphics device driver           */
int    GraphMode;               /* The Graphics mode value              */
struct point { int x,y; } p1;
int radius,x,y,i;
float d;

  printf("give me the center--->"); scanf("%d %d",&p1.x,&p1.y);
  printf("give me the radius -->"); scanf("%d",&radius);
  getche();

  GraphDriver = DETECT;                 /* Request auto-detection       */
  initgraph( &GraphDriver, &GraphMode, "" ); /* just increasing p1 - p2 */

  setcolor(14); circle(p1.x,p1.y,radius); getche();

  x=0; y=radius; d=5.0/4-radius;
  while (x<=y) {
    common(p1.x,p1.y,x,y);
    if (d<0) d=d+2*x+3;
    else { d=d+2*(x-y)+5; y--; }
    x++;
  }
  getche(); closegraph();   /* Return the system to text mode       */
}