#include "stdafx.h"
#include<iostream>
#define PI 3.1415926 ;
using namespace std ;
double Area (int radius)
double Length(int radius)
int main(int argc, char* argv[])
{
double C_Length, C_Area;
int R_adius;
cout<<"请输入圆的半径:"<<endl;
cin>>R_adius;
C_Length=double Length(int R_adius);
C_Area =double Area (int R_adius);
cout<<"圆的周长为:"<<C_Length<<" "<<"圆的面积为:"<<C_Area<<endl;
return 0;
}
double Area (int radius)
{
return(PI*radius*radius);
}
double Length(int radius)
{
return(PI*radius*2) ;
}