W3School TIY Editor

public class Main { public static void main(String[] args) { System.out.println(Math.atan(0.5)); System.out.println(Math.atan(-0.5)); System.out.println(Math.atan(5)); System.out.println(Math.atan(-5)); System.out.println(Math.atan(100)); System.out.println(Math.atan(-100)); } }