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)); //3.0 System.out.println(Math.ceil(Math.PI)); //4.0 }}h..