Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.

• Example 1:

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Input: a = 1, b = 2
Output: 3

-Example 2:

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Input: a = -2, b = 3
Output: 1

不用 +，-运算符计算两个 int 值的和.

实现

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public int (int a, int b) {
      return (b == 0) ? a : getSum(a ^ b, (a & b) << 1);
   }

参考资料

• sum-of-two-integers