#include <iostream>

using namespace std;

class Circle
{
public:
	int radius;
	Circle();
	Circle(int r);
	double getArea();


};

Circle::Circle()
{
	radius = 1;
	cout << "반지름" << radius << "원 생성" << endl;

}

Circle::Circle(int r)
{
	radius = r;
	cout << "반지름" << radius << "원 생성" << endl;


}

double Circle::getArea()
{
	return 3.14*radius*radius;

}

int main()
{
	Circle donut;
	double area = donut.getArea();
	cout << "donut 면적은" << area << endl;

	Circle pizza(30);
	area = pizza.getArea();
	cout << "pizza 면적은" << area << endl;


}