#include 
#include 
#define color 10
void eightWaySymmetricPlot(int xc,int yc,int x,int y)
{
    putpixel(x+xc,y+yc,color);
    putpixel(x+xc,-y+yc,color);
    putpixel(-x+xc,-y+yc,color);
    putpixel(-x+xc,y+yc,color);
    putpixel(y+xc,x+yc,color);
    putpixel(y+xc,-x+yc,color);
    putpixel(-y+xc,-x+yc,color);
    putpixel(-y+xc,x+yc,color);
}
void PolarCircle(int xc,int yc,int r)
{
    int x,y,d;
    x=0;
    y=r;
    d=3-2*r;
    eightWaySymmetricPlot(xc,yc,x,y);
    while(x<=y)
    {
        if(d<=0)
        {
            d=d+4*x+6;
        }
        else
        {
            d=d+4*x-4*y+10;
            y=y-1;
        }
        x=x+1;
        eightWaySymmetricPlot(xc,yc,x,y);
    }
}
int main(void)
{
    int gdriver = DETECT, gmode, errorcode;
    int xc,yc,r;
    initgraph(&gdriver, &gmode, "c:\\turboc3\\bgi");
errorcode = graphresult();
if (errorcode != grOk)  
    {
        printf("Graphics error: %s\n", grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);             
    }
printf("Enter the values of xc and yc ,that is center points of circle : ");
    scanf("%d%d",&xc,&yc);
    printf("Enter the radius of circle : ");
    scanf("%d",&r);
    PolarCircle(xc,yc,r);
    getch();
    closegraph();
    return 0;
}