DoWhile Loops

import java.util.Scanner;

public class DoWhileLoop {
    //-------------------------Ex1-------------------------

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        int num;
        do {
            System.out.println("Please enter a 3 digit number: ");
            num = sc.nextInt();
        }while(num < 100 || num > 999);
        System.out.printf("you entered: %d", num);

    //-------------------------Ex2-------------------------

        Scanner sc = new Scanner(System.in);
        int num;
        do {
            System.out.println("Please enter a 3 digit number that is divided by 7: ");
            num = sc.nextInt();
        }while(num < 100 || num > 999 || num % 7 != 0);
        System.out.printf("you entered: %d", num);

     //-------------------------Ex3-------------------------

        Scanner sc = new Scanner(System.in);
        int num;
        do {
            System.out.println("Please enter a 2 digit number with same digits value: ");
            num = sc.nextInt();
        }while(num < 10 || num > 99 || num % 10 != num / 10);
        System.out.printf("you entered: %d", num);
    }
}