Generation of circle using Bresenham's algorithm

/* Generation of circle using Bresenham's algorithm */

#include<stdio.h>
#include<graphics.h>
main()
{
int x,y,r,d,orgx,orgy,gd=DETECT,gm;
clrscr();
printf("\n Enter the radius of circle ");
scanf("%d",&r);
clrscr();
x=0;
y=r;
orgx=orgy=r;
d=1-r;
initgraph(&gd,&gm,"");
while(y>x)
{
if(d<0)
{
x++;
d=d+(2*x)+3;
}
else
{
x++;
y--;
d=d+(2*(x-y))+5;
}
putpixel(orgx+x,orgy+y,RED);
putpixel(orgx-x,orgy+y,RED);
putpixel(orgx+y,orgy+x,RED);
putpixel(orgx+x,orgy-y,RED);
putpixel(orgx-y,orgy+x,RED);
putpixel(orgx+y,orgy-x,RED);
putpixel(orgx-x,orgy-y,RED);
putpixel(orgx-y,orgy-x,RED);
}
getch();
return 0;
}