C Program For Bressenhams Circle Drawing Algorithm 

Source Code:


#include<graphics.h>
#include<stdlib.h>
#include<stdio.h>
#include<conio.h>

int xc,yc,r;

void symm(int x,int y)
{
 putpixel(x+xc,y+yc,WHITE);
 putpixel(-x+xc,-y+yc,WHITE);
 putpixel(x+xc,-y+yc,WHITE);
 putpixel(-x+xc,y+yc,WHITE);
 putpixel(y+xc,x+yc,WHITE);
 putpixel(-y+xc,-x+yc,WHITE);
 putpixel(-y+xc,x+yc,WHITE);
 putpixel(y+xc,-x+yc,WHITE);
}

void bhsmcircle(int xc,int yc,int r)
{
 int x=0,y=r,dp;
 dp=3-2*r;
 while(x!=y)
 {
  if(dp<0)
  {
   dp+=4*x+6;
   symm(++x,y);
  }
  else
  {
   dp+=4*(x-y)+10;
   symm(++x,--y);
  }
 }
}

void main()
{
 int gdriver = DETECT, gmode;
 initgraph(&gdriver, &gmode, "c:/tc/bgi");

 printf("Enter the centre co-ordinates: ");
 scanf("%d %d",&xc,&yc);
 printf("Enter the radius: ");
 scanf("%d",&r);
 bhsmcircle(xc,yc,r);
 getch();
}