1、题目
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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2、代码实现
public class Solution {
public int getSum(int a, int b) {
while(b != 0)
{
int tmp =(a & b) << 1;
//a是每次相加,相当于和
a = a ^ b;
//b相当于是进位
b = tmp;
}
return a;
}
}
