Question

c++程序设计，输入圆的半径r,要求输出圆的周长p和面积area，

公式为p=2πr，area=πr²
求大神= =急哭了
π取3.14

Answer 1

＃define PI 3.14
#include <iostream>
using namespace std;
int main()
{
    double r,p,area;
    cout<<"请输入半径";
    cin>>r;
    p=PI*r*2;
    cout<<"周长:"<<p<<endl;
    area=PI*r*r;
    cout<<"面积:"<<area<<endl;
    return 0;
}

Answer 2

#include<iostream>
using namespace std;
#define PI 3.1415927
void main()
{ double r,p,area;
cin>>r;
p=2*PI*r;
area=PI*r*r;
cout<<p<<","<<area<<endl;
}