#include <iostream>
using namespace std;

// area calculation program that employs functions that return values
// Albert Levi 11 Nov, 2002

double circlearea (double radius)
{
	double theArea;
	theArea = 3.14*radius*radius;
	return theArea;                  //or only   return 3.14*radius*radius;
}

int main()
{
	double r, area;
	
	r = 3;
	
	area = circlearea(r);
	cout << "the area of the circle with radius " << r << " is " << area << endl;
	
    cout << circlearea(12) << endl;

    if (circlearea(r/2) >= 100) 
	    cout << "large circle" << endl;

	circlearea(r);     // syntax ok, but meaningless function call; returned value is not used
	
    return 0;
}