Draw a circle using mid point circle drawing algorithm in Second Order

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

void bressCir(int);

void circlepoints(int, int);

void main()

{

      int gdriver=DETECT, gmode, r;

      initgraph(&gdriver,&gmode,"c:\\tc\\bgi");

      cleardevice();

      printf("Enter the Radius : ");

      scanf("%d",&r);

      bressCir(r);

      getch();

      closegraph();

}

void bressCir(int r)

{

      int x=0, y=r , d=1-r;

      circlepoints(x,y);

      while(x <= y)

      {

            if(d < 0)

                  d += 4*x + 3;

            else

            {

                  d += 4*(x-y) + 10;

                  y--;

            }

            x++;

            circlepoints(x,y);

      }

}

void circlepoints(int x, int y)

{

      putpixel(319+x,239+y,11);

      putpixel(319+x,239-y,11);

      putpixel(319-x,239+y,11);

      putpixel(319-x,239-y,11);

      putpixel(319+y,239+x,11);

      putpixel(319+y,239-x,11);

      putpixel(319-y,239+x,11);

      putpixel(319-y,239-x,11);

}