class Circular{
  void setR(double R);
private:
  double r;
public:
  double getArea(double r);
  double getCircum(double r);
};
void Circular::setR(double R){
  r=R;
}
double Circular::getArea(double r){
  return 3.1416*r*r;
}
double Circular::getCircum(double r){
  return 2*3.1416*r;
}
void setup() {
  Serial.begin(9600);
  randomSeed(analogRead(0));

}

void loop() {
  Circular C1;
  double r = random(0-20);
  Serial.print("r = ");
  Serial.println(r);
  Serial.print("Circle Area = ");
  Serial.println(C1.getArea(r));
  Serial.print("Circumference = ");
  Serial.println(C1.getCircum(r));
delay(2000);

}