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

//Create a macro named PI.  No semicolon.
#define PI 3.14159265358979

int main()
{
	const double r {1.0};   //radius of circle and sphere

	cout << "Radius of circle = " << r << "\n";

	//conditional compilation
#ifdef PI
	cout << "Circumference of circle = " << 2 * PI * r << "\n";
	cout << "Area of circle = " << PI * r * r << "\n";
	cout << "Surface of sphere = " << 4 * PI * r * r << "\n";
	cout << "Volume of sphere = " << 4 * PI * r * r * r / 3 << "\n";
#endif

	return EXIT_SUCCESS;
}