import java.util.*;
class MenuDriven
{
    public static void main(String[] args) 
    {
        boolean exit=false;
        Scanner input=new Scanner(System.in);
        System.out.println("Enter Number: ");
        double num=input.nextDouble();
        System.out.println("1 Ceiling");
        System.out.println("2 Floor");
        System.out.println("3 Absolute");
        System.out.println("4 (a+b)^3");
        System.out.println("5 Exit");
        do{
        System.out.print("Enter your choice: ");
        int choice=input.nextInt();
        switch(choice){
            case 1: 
                System.out.println(Math.ceil(num));
                break;
            case 2:
                System.out.println(Math.floor(num));
                break;
            case 3:
                System.out.println(Math.abs(num));
                break;
            case 4:
                break;
            case 5:
                exit=true;
                System.exit(0);
                break;
        }
        }
        while(!exit);
   }
}

Java Reverse Number

import java.util.*;

public class ReverseNumber{
  public static void main(String [] args){
  Scanner input=new Scanner(System.in));
  System.out.print("Enter number");
  int num= inout.nextInt();
  int n = num;
  int rev=0;
  System.out.println("Number: ");
  System.out.println(" "+ num);
  for (int i=0; i<=num; i++){
  int r=num%10;
  num=num/10;
  rev=rev*10+r;
  i=0;
  }
  System.out.println("Reversed Number: "+ rev);  
  }
}