/**

* Write a program, which prompts user for a radius (of double)

* and compute the area and perimeter of a circle.

*

* The output shall look like:

*

* Enter the radius: 1.2

* The area is 4.5239

* The perimeter is 7.5398223686155035

*

* Hints: π is kept in a constant called Math.PI.

*/

package javaexercises.keyboard;

import java.util.Scanner;

/**

*

* @author User

*/

public class CircleComputation {

public static void main(String[] args) {

CircleComputation aCircleComputation = new CircleComputation();

aCircleComputation.runComputation();

}

private void runComputation()

{

Scanner in = new Scanner(System.in);

double radius;

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

radius = in.nextDouble();

double area = Math.PI * Math.pow(radius, 2);

System.out.printf("\nThe area is %1$.4f", area);

double perimeter = 2*Math.PI * radius;

System.out.printf("\nThe perimeter is %1$.16f\n", perimeter);

}

}