#include <iostream>

using namespace std;

//Initializes the main function
int main()
{
    double rad{0.0};
    double circ{0.0};
    double diam{0.0};
    double area{0.0};
    double pi{3.14159};

    cout << "Radius? " << endl;
    cin >> rad;

    //Defining the variables
    circ = 2 * pi * rad;
    diam = 2 * rad;
    area = pi * (rad * rad);

    //Output for the user
    cout << "Circumference is " << circ << endl;
    cout << "Diameter is " << diam << endl;
    cout << "Area is " << area << endl;


}