public class Number {

public static void main(String[] args) {

// Operator

System.out.println(6 + 2); // 8

System.out.println(6 - 2); // 4

System.out.println(6 * 2); // 12

System.out.println(6 / 2); // 3

System.out.println(Math.PI); // 3.141592653589793

System.out.println(Math.floor(Math.PI));

System.out.println(Math.ceil(Math.PI));

}

}