#include <iostream>
#include <iomanip>

using namespace std;
#define PI 3.1415926535897932385
#define CIRCLEAREA(x) (PI*(x)*(x))
#define CIRCLEDIAMETER(x) (2*(x))
#define CIRCLECIRCUMFERENCE(x) (2*PI*(x))

int main() {
    double radius;
	cout.setf(ios::fixed | ios::showpoint);
    cout.width(10);
    cout.precision(10);

	cout << "Enter A Radius: ";
    cin >> radius;

    cout << "radius   = " << radius << endl;
    cout << "diameter = " << CIRCLEDIAMETER(radius) << endl;
    cout << "circumf. = " << CIRCLECIRCUMFERENCE(radius) << endl;
    cout << "area     = " << CIRCLEAREA(radius) << endl;
    
    system("pause");
    return 0;
}