LintCode-1.A + B 问题

A + B 问题

code

class Solution {
public:
/*
* @param a: The first integer
* @param b: The second integer
* @return: The sum of a and b
*/
int aplusb(int a, int b) {
// write your code here, try to do it without arithmetic operators.
int result=0,num=0;

do {
result = a ^ b;
num = (a & b) << 1;
a = result;
b = num;
} while(b != 0);

return result;
}
};