#include <graphics.h> /*预定义库函数*/
void circlePoint(int x,int y)/*八分法画圆程序*/
{
circle(320+x*20,240+y*20,3)
circle(320+y*20,240+x*20,3)
circle(320-y*20,240+x*20,3)
circle(320-x*20,240+y*20,3)
circle(320-x*20,240+y*20,3)
circle(320-x*20,240-y*20,3)
circle(320-y*20,240-x*20,3)
circle(320+y*20,240-x*20,3)
circle(320+x*20,240-y*20,3)
}
void MidBresenhamcircle(int r) /* 中点Bresenham算法画圆的程序 */
{
int x,y,d
x=0y=rd=1-r /* 计算初始值 */
while(x<y)
{ circlePoint(x,y) /* 绘制点(x,y)及其在八分圆中的另外7个对称点 */
if(d<0) d+=2*x+3/* 根据误差项d的判断,决定非最大位移方向上是走还是不走 */
else
{ d+=2*(x-y)+5
y--
}
x++
delay(900000)
} /* while */
}
main()
{
int i,j,r,graphmode,graphdriver
detectgraph(&graphdriver,&graphmode)
initgraph(&graphdriver,&graphmode," ")
printf("中点Bresenhamcircle算法画圆的程序\n")/*提示信息*/
printf("注意 |r|<=11")
printf("\n输入半径值 r:")
scanf("%d",&r)
printf("按任意键显示图形...")
getch()
cleardevice()
setbkcolor(BLACK)
for(i=20i<=620i+=20) /*使用双循环画点函数画出表格中的纵坐标*/
for(j=20j<=460j++)
putpixel(i,j,2)
for(j=20j<=460j+=20) &n欢迎光临学网,收藏本篇文章 [1] [2]
$False$
bsp/*使用双循环画点函数画出表格中的横坐标*/
for(i=20i<=620i++)
putpixel(i,j,2)
outtextxy(320,245,"0")/*原点坐标*/
outtextxy(320-5*20,245,"-5")circle(320-5*20,240,2) /*横坐标值*/
outtextxy(320+5*20,245,"5")circle(320+5*20,240,2)
outtextxy(320-10*20,245,"-10")circle(320-10*20,240,2)
outtextxy(320+10*20,245,"10")circle(320+10*20,240,2)
outtextxy(320-15*20,245,"-15")circle(320-15*20,240,2)
outtextxy(320+15*20,245,"15")circle(320+15*20,240,2)
outtextxy(320,240-5*20,"-5")circle(320,240-5*20,2) /*纵坐标值*/
outtextxy(320,240+5*20,"5")circle(320,240+5*20,2)
outtextxy(320,240-10*20,"-10")circle(320,240-10*20,2)
outtextxy(320,240+10*20,"10")circle(320,240+10*20,2)
outtextxy(20,10,"The center of the circle is (0,0) ") /*坐标轴左上角显示提示信息*/
setcolor(RED)/*标记坐标轴*/
line(20,240,620,240) outtextxy(320+15*20,230,"X")
line(320,20,320,460) outtextxy(330,20,"Y")
setcolor(YELLOW)
MidBresenhamcircle(r)
setcolor(BLUE)/*绘制圆*/
circle(320,240,r*20)
setcolor(2)
getch()
closegraph()
}
C语言求圆周长和面积方法如下：#include "stdio.h"
void main()
{
float PAI=3.14,r,c,area
printf("enter radius: \n")
scanf("%f",&r)
c=2*PAI*r
area=PAI*r*r
printf("圆半径r=%.2f,圆周长c=%.2f,圆面积area=%.2f\n",r,c,area)
}
拓展资料：
C语言编程软件是一款使用代码C语言进行编程的软件，C语言简洁、高效、灵活的特性令其具有独特魅力。现在的程序编写朝着越来越冗长庞大的方向发展，而C语言虽然属于相对'低级'的编程语言，但它的简洁之美是无可替代的。
#include <stdio.h>#define PI 3.1415927
struct cir
{
double x
double y
double r
}
int main()
{
struct cir m
scanf("%lf%lf%lf",&m.x,&m.y,&m.r)
printf("S=%lf\n", m.r*m.r*PI)
return 0
}
