LeetCode:Sum of Two Integers

Sum of Two Integers

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

+

 and 

-

.
Example:

Given a = 1 and b = 2, return 3.
Credits:

Special thanks to @fujiaozhu for adding this problem and creating all test cases.

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 Bit Manipulation

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 (M) Add Two Numbers

思路：

之前总结的：位操作实现加减乘除四则运算

c++ code:

class Solution {
public:
int getSum(int a, int b) {
int c; // 进位
while(b) {
c = (a & b) << 1;
a = a ^ b;
b = c;
}
return a;
}
};