class Circle {
    double radius;
    double diameter;
    double circumference;
    double area;
    
    public Circle(double radius) {
        setRadius(radius);
    }
    
    void setRadius(double radius) {
        this.radius = radius;
        this.diameter = 2 * radius;
        this.circumference = 2 * Math.PI * radius;
        this.area = Math.PI * Math.pow(radius, 2);
    }
    
    void setDiameter(double diameter) {
        this.setRadius(diameter / 2.0);
    }
    
    void print() {
        System.out.println("radius = " + radius);
        System.out.println("diameter = " + diameter);
        System.out.println("circumference = " + circumference);
        System.out.println("area = " + area);
    }
}