求圓面積

import java.util.Scanner; //package name

public class AreaOfCircle{
public static void main(String[] args){

final float PI = 3.14f ;
float result;

Scanner input = new Scanner(System.in);//controller input
float radius = input.nextInt();//read radius
result = PI*radius*radius;

System.out.println("The area of a circle is equal "+result);

}

}