import java.util.Scanner;

public class Circle {

//todo: add some methods to compute a circle's diameter, circumference and area.

//print some outputs to confirm you methods are working right.

public static double diameter(double r){

return 2*r;

}

public static double circum(double r){

return 2*3.1416*r;

}

public static double area(double r){

return 3.1416*r*r;

}

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

Circle cir = new Circle();

while (true){

System.out.println("Enter the radius: ");

double radius = scan.nextDouble();

double diameter = cir.diameter(radius);

double circum = cir.circum(radius);

double area = cir.area(radius);

System.out.println("Diameter is: "+diameter+"\nCircumsfarance is: "+circum+"\nArea is: "+area);

}

}

}