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[Title Description]

Write a function that add two numbers A and B. You should not use + or any arithmetic operators.

Notice:There is no need to read data from standard input stream. Both parameters are given in function aplusb, you job is to calculate the sum and return it.

Given two integers a and b, find their sum, but do not use mathematical operators such as +.

Note: you don't need to read data from the input stream, just calculate the sum of aplusb's two parameters a and b and return it.

[Title Link]

http://www.lintcode.com/en/problem/a-b-problem/

[Title Analysis]

There is nothing to say directly +, the key lies in the operation without +: test Bit Operation, can be used by bit ^exclusive or two operands corresponding to bits and carry, only carry is 1 or 0 needs to be discussed separately. Find a better solution.

Bit operation to achieve integer addition is essentially binary operation. It uses two basic expressions: x^y //performs addition, regardless of carry. (x&y)

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