class circle : public shape
       {
public:
       circle(palette c, double r);
       double area() const;
       const char *name() const;
       ostream &put(ostream &os) const;
private:
       double radius;
       };

circle::circle(palette c, double r) : shape(c), radius(r) { }

double circle::area() const
       {
       const double pi = 3.1415926;
       return pi * radius * radius;
       }

const char *circle::name() const
       {
       return "circle";
       }

ostream &circle::put(ostream &os) const
       {
       return shape::put(os) << " with radius = " << radius;
       }

// End of File