Bresenham's Circle drawing Algorithem

#include <iostream.h>
#include<conio.h>
#include <dos.h>
#include <graphics.h>
void drawCircle(int xc, int yc, int x, int y)
{
putpixel(xc+x, yc+y, WHITE);
putpixel(xc-x, yc+y, WHITE);
putpixel(xc+x, yc-y, WHITE);
putpixel(xc-x, yc-y, WHITE);
putpixel(xc+y, yc+x, WHITE);
putpixel(xc-y, yc+x, WHITE);
putpixel(xc+y, yc-x, WHITE);
putpixel(xc-y, yc-x, WHITE);
}
void circleBres(int xc, int yc, int r)
{
int x = 0, y = r;
int d = 3 - 2 * r;
while (x < y)
{
drawCircle(xc, yc, x, y);
x++;

if (d < 0)
d = d + 4 * x + 6;
else
{
y--;
d = d + 4 * (x - y) + 10;
}
delay(100);
}
}
void main()
{
int xc, yc, r;
int gd = DETECT, gm;
initgraph(&gd, &gm, "c:\\tc\\bgi");
setbkcolor(11);
cout<<"\n\t\tBresenham's Circle drawing Algoritham";
cout<<"\n\t\t*************************************\n";
cout<<"\n\tEnter coordinates of circle:\n";
cout<<"\tXc=";
cin>>xc;
cout<<"\tYc=";
cin>>yc;
cout<<"\n\tRadius of circle=";
cin>>r;
circleBres(xc, yc, r);
getch();
}