Reverse a number

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		System.out.print("Enter a number : ");
		long num = in.nextLong();
		long rem;
		long rev = 0;
		while(num != 0){
			rem = num % 10;
			rev = rev * 10 + rem;
			num /= 10;
		}
		System.out.println("Reverse is "+rev);
	}
}