Question

Write a method that calculates an area of a circle given a radius as an input. Call the method you define in the main and test your problem. The input is being given by the user in the main and sent to the method as an input.

Answer 1

import java.util.Scanner;

public class CircleArea {

    public static double areaOfCircle(double radius) {
        return Math.PI * radius * radius;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter radius of the circle: ");
        double radius = in.nextDouble();
        System.out.println("Area of the circle is " + areaOfCircle(radius));
    }
}