编写函数,计算圆面积c语言

#include#definePI3.1415926doublearea(doubler){returnPI*r*r;}doubleperimeter(doubler){return2*PI*r;}i

#includemain(){\x09floatS(floatr);\x09floatr;\x09printf("inputr:");\x09scanf("%f",&r);\x09printf("圆面

#includeintisprime(inti);//大小写错误voidmain()//省略是默认返回值为int{intnumber;printf("Pleaseinputanumbertotesti

#includedoublecalRectArea(doubledWidth,doubledHeigh){returndWidth*dHeigh;}voidmain(){doublea,b,mul;s

intarea(intx,inty){returnx*y;}intgri(intx,inty){return2*(x+y);}

#include<stdio.h>double zc(double x, double y){    ret

#includemain(){doublex,y;scanf("%lf",&x);if(x

#include <stdio.h>#include <math.h>//double sin(double x);#define&nb

#include <stdio.h>float area(float r){  return 3.14159 *&nb

#includeintgetArea(intlen){\x09returnlen*len;}intmain(){\x09intn;\x09intarea;\x09\x09printf("请输入边长:\

#include#includemain(){inta,b,c,flag;floatarea,s;printf("inputsideoftriangle:");scanf("%d%d%d",&a,&b

.就知道一个周长,怎么求面积啊?N种可能啊满意请采纳

#include#include#definepi3.14floatcfxmj(floata,floatb){flaotarea;area=a*b/2;returnarea;}floatarc(flo

#includevoidmain(){doubler,s,l;printf("请输入圆的半径\n");scanf("%lf",&r);s=3.14159*r*r;l=2*3.14159*r;print

#include <stdio.h>int main(){  float x, tax = 0; 

#includevoidmain(){intn=1,N,i;scanf("%d",&N);if(N20)printf("shuruwuxiao!\n");else{for(i=1;i

//使用海伦公式#include/*ForIO*/#include/*Forsqrt()*/intmain(void){doublea,b,c,p,s;printf("请输入a,b和c：");scan

两个数,只可能是底和高吧.#includevoidmain(){floatSide,Height;//底和高floatSpace;printf("pleaseinputSideanditsHeight

m=2a+2b;应该改成m=2*a+2*b;程序中2a,2b是不允许的,没有意义的.

以往写的#includeintfun(intn){if(n==1||n==2)return1;elsereturnfun(n-1)+fun(n-2);}intmain(void){intn,i=0;p