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class Circle {
public:
Circle(double r = 0.0) { _radius = r; }
void setRadius(double r) { _radius = r; }
double area() { return pi * _radius * _radius; }
double circum() { return 2 * pi * _radius; }
private:
double _radius;
const static double pi;
};
const double Circle::pi = 3.14159;