public static long sumDigits(long n){        long total=0;        long number=n;        while(number!=0){            total=total+number%10;            number=(number-number%10)/10;        }        return total;    }    public static void testSumDigits(){        System.out.println("Enter a long integer: ");        Scanner input=new Scanner(System.in);        long n=input.nextLong();        long result=sumDigits(n);        System.out.print("The sum of every number of the integer is:"+ result );    }