20220607 others: sum of two integers

        Title Description ： Here are two integers  a  and  b , Don't use   Operator  +  and  - , Calculates and returns the sum of two integers .

        coded ：

    public static int getSum(int a, int b) {
        int bit = (a & b) << 1;
        int result = a ^ b;
        if (bit != 0){
            return getSum(result,bit);
        }
        return result;
    }