一、C语言程序。intr. 求圆的面积和周长

输入圆的半径，求 圆的面积和周长：

#include <stdio.h>

int main(){

double r,s,a;

double pi=3.14159265;

printf(input radius:\n);

scanf(%lf,&r);

a=pi*r*r

s=2*pi*r;

printf(area is %lf, s is %lf\n,a,s);

return 0;

}

二、C语言程序设计 求一个圆的面积，圆的半径要求从键盘出入

#include<studio.h>

#define pi 3.14

main()

{

float fRadius,fArea;

printf(请输入圆的半径fRadius：\n)

scanf(%f\n,&fRadius);

fArea=pi*fRadius*fRadius;

printf(圆的面积fArea=%f\n,fArea);

getchar();

}

三、c语言求圆的面积和周长

C#程序：

using System;

class Program

{

    static void Main()

    {

        double r;                                 //圆半径

    double circle;                           //圆周长

    double area;                            //圆面积

    const double PI = 3.14159;      //π

        Console.Write(请输入半径：);

        r = double.Parse(Console.ReadLine());

        circle = 2 * PI * r;        //计算圆周长

    area = PI * r * r;          //计算圆面积

    Console.WriteLine(半径为{0}的圆周长为{1}, r, circle);

        Console.WriteLine(半径为{0}的圆周长为{1}, r, area);

    }

}

运行测试：

四、c语言画圆 已知半径 圆心

#include <math.h>

#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=0;y=r;d=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=20;i<=620;i+=20) /*使用双循环画点函数画出表格中的纵坐标*/

for(j=20;j<=460;j++)

putpixel(i,j,2);

for(j=20;j<=460;j+=20) &n欢迎光临学网,收藏本篇文章 [1] [2]

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bsp; /*使用双循环画点函数画出表格中的横坐标*/

for(i=20;i<=620;i++)

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();

}