First And Last Digit Sum

gistfile1.txt

 public static int sumFirstAndLastDigit(int number) {
        int lastDigit;
        int sum = 0;

        if(number<0){
            return -1;
        }
        lastDigit = number % 10;

        while (number > 9) {//this will give us last digit
            number = number / 10;
        }
        sum = lastDigit + number;


        return sum;
    }