package org.launchcode.java.studios;

import java.util.Scanner;

/**

* Created by melocal on 2/28/17.

*/

public class Area {

public static void main(String[] args) {

double PI = 3.14;

double r;

double area;

Scanner in = new Scanner(System.in);

do{

System.out.println("Enter a positve number for radius: ");

while (!in.hasNextDouble()){

System.out.println("Enter a positive number for radius: ");

in.next();

}

r = in.nextDouble();

} while (r <= 0);

area = PI * r * r;

System.out.println("The radius of a circle of radius " + r + "is: " + area);

}

}