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#include<iostream>
#include<math.h>
#include<graphics.h>
using namespace std;
void dda_circle(int xc,int yc,int r);
int main()
{
   int xc,yc,r,gd=DETECT,gm;
  cout<<" Enter the Center point (xc,yc) :";
   cin>>xc>>yc;
   cout<<" Enter the Radius :";
   cin>>r;
  initgraph(&gd,&gm,"");
   setcolor(10);
   line(0,240,640,240);
   line(320,0,320,480);
   setcolor(5);
   xc = 320 + xc;
   yc = 240 - yc;
   dda_circle(xc,yc,r);
   getch();
closegraph();  
return 0;
}
void dda_circle(int xc,int yc,int r)
{
   float xc1,xc2,yc1,yc2,eps,sx,sy;
  int val,i;
  xc1=r;
  yc1=0;
  sx=xc1;
  sy=yc1;
  i=0;
  do{
      val=pow(2,i);
      i++;
      }while(val<r);
  eps = 1/pow(2,i-1);
  do{
      xc2 = xc1 + yc1*eps;
      yc2 = yc1 - eps*xc2;
      putpixel(xc+xc2+r,yc-yc2,3);
      putpixel(xc+xc2-r,yc-yc2,4);
      putpixel(xc+xc2,yc-yc2+r,5);
      putpixel(xc+xc2,yc-yc2-r,6);
      putpixel(xc+xc2,yc-yc2,15);
      xc1=xc2;
      yc1=yc2;
     }while((yc1-sy)<eps || (sx-xc1)>eps);
}