c 编程输入半径求圆的面积

#include#definepi3.141592653intmain(){doubler;printf("输入半径：\n");scanf("%lf",&r);printf("周长为：\n");pri

#definePI3.1416//后面不需要;#include"stdio.h"//注意关键字之间要有空格intmain(){floatr,s,c;scanf("%f",&r);c=2*PI*

在输入半径的时候,语句改成scanf("%d",&r);不过你最好将半径定义成float型变量,格式的问题

voidmain(){floatr,s,l;floatpi=3.1415;printf("输入一个圆的半径:\n");scanf("%f",&r);if(

#include#definePI3.1415926\x05\x05voidmain()\x05{\x05doubler,s;scanf("%f",&r);s=PI*r*r;\x05printf("A

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespaceConsoleApplic

拿去慢慢研究吧#includeintmain(void){doubler=3.0,pi=3.14159,s;s=r*r*pi;printf("圆的面积为%lf",s);return0;}

1.#includeintmain(){floatr,s,l,v;printf("请输入半径\n");scanf("%f",&r);s=3.14*r*r;l=2*3.14*r;v=4.0/3.0*3.

PublicSubcommand1_click()dimrasintegerr=val(inputbox("请输入半径"))s=3.1415926*r^2msgbox"圆的面积为:"&sendsu

#include"stdio.h"#definePI3.14intmain(){floatarea,sum=0;for(inti=1;i

#includeintmain(){intr=0;floata=0,l=0;scanf("%d",&r);a=r*r*3.14;l=r*2*3.14;printf("面积:%f,周长:%f",a,l)

#include#includemain(){doublearea,length;doubler=pi=3.1215926area=pi*r*r；length=2*pi*r；}

#include<stdio.h>#define Pi 3.14159double Square(double r){  &nb

#include"stdio.h"#definePI3.141592653//定义πintmain(void){floatC,A,V,r;printf("请输入半径：");//提示输入scanf("%

#include#include#defindPI3.141592654main(){doublevolume;floatradius;printf("Inputradius:");scanf("%f

用公式S=1/2absinC输入两边和角度面积等于两边和乘于夹角的正弦值再除以二记得加头文件#哈如你所说补上程序#include#include#include#definePI3.14159main

input"输入半径:"torc=2*3.14*rs=3.14*r*rv=4*3.14*r^3/3?"圆周长=",c?"圆面积=",s?"球体积=",v

#includeusingnamespacestd;intmain(){doubler;doublev;constdoublepi=3.14159;cout再问：运行程序有一个错误..我找不到

        void calcation()     &

#include#includeusingnamespacestd;//圆周率constdoublePI=acos(-1);intmain(intargc,char*argv[]){\x05doubl