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

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

void midpoint(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);

      midpoint(r);

      getch();

      closegraph();

}

void midpoint(int r)

{

      int x=0, y=r , d=1-r;

      int de=3, dse=-2*r+5;

      circlepoints(x,y);

      while(y > x)

      {

            if(d < 0)

            {

                  d += de;

                  dse += 2;

            }

            else

            {

                  d += dse;

                  dse += 4;

                  y--;

            }

            de += 2;

            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);

}