# include <iostream.h>
# include <conio.h>
# include <graphics.h>
# include <math.h>
void Circle(int Radius,int xC,int yC);
void main()
{
    int gDriver=DETECT, gMode;
    initgraph(&gDriver,&gMode,"c:\\tc\\bgi");

    int Radius, xC, yC;
    cout<< endl << "Enter Center point coordinates...";
    cout<<endl<<"  Xc    : ";
    cin>>xC;
    cout<<endl<<"  Xc    : ";
    cin>>yC;
    cout<<endl<<"Radius  : ";
    cin>>Radius;
    cleardevice();
    Circle(Radius,xC,yC);
    getch();
    return;
}
void Circle(int Radius,int xC,int yC)
{
    int P;
    int x,y;
    void Draw(int x,int y,int xC,int yC);
    P = 1 - Radius;
    x = 0;
    y = Radius;
    Draw(x,y,xC,yC);
    while (x<=y)
    {
        x++;
        if (P<0)
        {
            P += 2 * x + 1;
        }
        else
        {
            P += 2 * (x - y) + 1;
            y--;
        }
        Draw(x,y,xC,yC);
    }

}
void Draw(int x,int y,int xC,int yC)
{
    putpixel(xC + x,yC + y,12);
    putpixel(xC + x,yC - y,12);
    putpixel(xC - x,yC + y,12);
    putpixel(xC - x,yC - y,12);
    putpixel(xC + y,yC + x,12);
    putpixel(xC - y,yC + x,12);
    putpixel(xC + y,yC - x,12);
    putpixel(xC - y,yC - x,12);
}