Divisible by three

Question

i'm new in coding and tried to do some open university tasks. Maybe you guys can give some helping hand. I really even don't know how to start this task, witch is divide three Integers from main to method. Example 2, 10 where I should print 3, 6, 9 or 2, 6 where I should print 3, 6.

import java.util.Scanner;

public class divideByThree {

    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);

        divideByThree(2, 10);

    }
    public static void divideByThree(int start, int end) {

        while(true) {
            if (start % 3 == 0) {
                start++;
            }
            if (end % 3 == 0) {
                System.out.println(end);

            }
            System.out.println(start);
     }

    }
}

Answer 1

1. Do not use while(true) because it creates an infinite loop which will unnecessarily make your program complex.
2. You need to increase start by 1 in each iteration and terminate the loop when the value of start value goes beyond end.
3. Whenever start % 3 == 0 becomes true, print start.

Given below is a sample code which you can use to understand the points mentioned above.

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        System.out.print("Enter the start number: ");
        int start = reader.nextInt();
        System.out.print("Enter the end number: ");
        int end = reader.nextInt();
        divideByThree(start, end);
    }

    public static void divideByThree(int start, int end) {
        while (start <= end) {
            if (start % 3 == 0) {
                System.out.println(start);
            }
            start++;
        }
    }
}

A sample run:

Enter the start number: 3
Enter the end number: 9
3
6
9