#include?“stdio.h“
#include?“conio.h“
#include“graphics.h“
#include

void?circlepoint（int?x0int?y0int?xint?yint?color）?/*利用圓的八對稱性*/

{

putpixel（x0+xy0+ycolor）;

putpixel（x0+yy0+xcolor）;

putpixel（x0+xy0-ycolor）;

putpixel（x0+yy0-xcolor）;

putpixel（x0-xy0+ycolor）;

putpixel（x0-yy0+xcolor）;

putpixel（x0-xy0-ycolor）;

putpixel（x0-yy0-xcolor）;

}

void?midpointcircle（int?x0int?y0int?rint?color）

{

int?xydsamechange;

x=0y=rd=5-4*rsame=12change=20-8*r;???/*從點(diǎn)（0r）畫到點(diǎn)（r/1.413r/1.414）*/

circl