C Program for Midpoint Circle Drawing algorithm.

 C Program for Midpoint Circle Drawing algorithm:

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

void main()
{
int xc,yc,r,p,x,y;
int gd=DETECT,gm;
initgraph(&gd,&gm,"C:\\TURBOC3\\BGI");
clrscr();
printf("\n\n\tEnter the co-ordinates of center : ");
scanf("%d %d",&xc,&yc);
printf("\n\n\tEnter the radius: ");
scanf("%d",&r);

x = 0;
y = r;
p=(1-r);

for(x=0;x<=y;x++)
{
if(p < 0)
{
x=x+1;
y=y;
p = p + (2 * x)+1;
}
else
{
x=x+1;
y=y-1;
p = p + 2 *(x)+1-2*(y);
}

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