C Program for Bresenham's Circle Drawing Algorithm

 C Program for Bresenham's Circle Drawing algorithm:

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

void main()
{
int xc,yc,r,p,x,y;
int gd,gm;
detectgraph(&gd,&gm);
initgraph(&gd,&gm,"C:\\TurboC3\\BGI");
clrscr();
printf("\nEnter the co-ordinates of center : ");
scanf("%d %d",&xc,&yc);
printf("\nEnter the radius: ");
scanf("%d",&r);

x = 0;
y = r;
p=3-(2*r);

for(x=0;x<=y;x++)
{
if(p < 0)
{
p = p + (4 * x)+6;
}
else
{
y=y-1;
p = p +4 *(x-y)+10;
}

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);
}

getch();
closegraph();
}

Output