20171113 - 03 - classEx_04

package myApp;

import java.util.Scanner;

public class class03_ex10 {

    public static void main(String[] args) {
        //init vars
        final int   TIMES = 3;
        final int   MOD = 3;

        int         n = 0,
                    nLength = 0;

        //open in_stream
        Scanner s = new Scanner(System.in);

        //usage info
        System.out.printf("Type in %d digits: ", TIMES);

        //nLength holds n's digit count
        while (nLength != TIMES || (n % MOD != 0)) {
            nLength = 0; //reset counter from last iteration
            n = s.nextInt(); //accept new n value

            //calc digit count
            for (int i=n; i>0; i /= 10) {
                nLength += 1;
            }

        }

        //close in_stream
        s.close();

        //exit msg
        System.out.printf("number %d accepted. exit..%n", n);

    }

}