20171109 - 03 - classEx_06

package myApp;

import java.util.Scanner;

public class class03_ex06 {

    public static void main(String[] args) {
        //init vars
        int n = 0;

        //usage msg
        System.out.println("Integer: ");

        //open in_Stream, parse & close
        Scanner s = new Scanner(System.in);
        n = s.nextInt();
        s.close();

        //loop n times
        for (int i=1; i<=n; i+=1) {
            int sum = 0; //hold sum of digits

            //calculate sum of digits using recursion
            for (int j=i; j>0; ) {
                sum += j%10; //add right digit to sum
                j /= 10; //remove right digit from the current iteretaion's number
            }

            //check myself
            //System.out.printf("sum %d: %d%n", i, sum);

            //output only numbers that match the pattern
            if (i%3==0 && sum<5) {
                System.out.println(i);
            }

        }
    }

}