#include <iostream>
#include <string>
using namespace std;

const double pi = 3.14159;


int main()
{
	double area, circum, diam, rad;

	cout << "Enter radius : " << flush;
	cin  >> rad;
	string ynarea;
	cout << "Print Area? (y/n) " << flush;
	cin  >> ynarea;
	string yncircum = "";
	cout << "Print Circumference? (y/n) " << flush;
	cin  >> yncircum;
	string yndiam = "";
	cout << "Print Diameter? (y/n) " << flush;
	cin  >> yndiam;

	area = pi * rad * rad;
	circum = pi * rad * 2.0;
	diam = rad * 2.0;

	if( ynarea == "y" || "Y" )
	{
	cout << "Area is " << area << endl;
	}
	else
	{
	cout << endl;
	}
	if( yncircum == "y" || "Y" )
	{
	cout << "Circumference is " << circum << endl;
	}
	if( yndiam == "y" || "Y" )
	{
	cout << "Diameter is " << diam << endl;
	}
	return 0;
}