A+AA+AAA+AAAA+....

numAdd

import java.util.Scanner;


public class Test {


    public static int numAdd(String inPut, String inPut2){

        int result = 0;

        if (inPut.equals(inPut2)){
            result = Integer.parseInt(inPut);
        }else{
            int temp = Integer.parseInt(inPut2)/10;
            result += Integer.parseInt(inPut2) + numAdd(inPut,String.valueOf(temp));

        }

        return result;

    }

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        int inPut ;

        do {
            System.out.print("input something(0 to quit) :");
            inPut = scanner.nextInt();
            System.out.println();

            String A = Integer.toString(inPut);
            String temp = new String();
            System.out.println("you enter :" + inPut);

            for (int i = 0; i < inPut; i++) {
                temp += A;
                System.out.print(temp);
                if (i < inPut-1) {
                    System.out.print("+");
                }

            }

            System.out.println(" = " + numAdd(A , temp));


        }while ( inPut !=0);

        System.out.println("TKS");

    }

}