package Lesson7;

/**
 * Java Start. Group 77. Home work. Lesson 7. Task 3 (CircleArea).
 *
 * @author Khilchenko Sergii
 * @version 0.1.0 05.15.2018
 *
 */

public class CircleArea {
    public static void main(String[] args) {
        System.out.println("CircleArea");

        double radius = -10;
        System.out.println("RADIUS: " + radius );
        System.out.println("Result: " + circleArea(radius));
    }

    public static double circleArea(double radius) {
        if (radius <= 0) {
            throw new IllegalArgumentException(" INPUT radius 0 <= ");
        }
        //return Math.PI * radius * radius;
        return Math.PI * Math.pow(radius, 2);
    }
}

/*
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            TEST 1
CircleArea
RADIUS: 10.0
Result: 314.1592653589793

Process finished with exit code 0
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            TEST 2
CircleArea
RADIUS: 20.0
Result: 1256.6370614359173

Process finished with exit code 0
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            TEST 3
CircleArea
Exception in thread "main" java.lang.IllegalArgumentException:  INPUT radius 0 <=
	at Lesson7.CircleArea.circleArea(CircleArea.java:22)
	at Lesson7.CircleArea.main(CircleArea.java:17)
RADIUS: -10.0

Process finished with exit code 1
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 */