package org.launchcode.java.studios.areaofacircle;

import java.util.Scanner;

public class Area {
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter a radius");
        double radius = input.nextDouble();
        double area = 3.14 * radius * radius;

        System.out.println("Area of circle is :" + area);
    }
}


////Here it is with an if/else statement for negative numbers
package org.launchcode.java.studios.areaofacircle;

import java.util.Scanner;

public class Area {
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter a radius");
        double radius = input.nextDouble();
        double area = 3.14 * radius * radius;
        if (radius < 0){
            System.err.println("Radius must be a positive int.");
            //System.exit(status:1);
        }else {
            System.out.println("Area of circle is :" + area);
        }


    }
}