LeetcodeSum of Two Integers
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题目链接:https://leetcode.com/problems/sum-of-two-integers/
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.
思路:
唉,这题虽然是easy,但是真好烦的一题,之前在hihocoder(还是其他oj)上好像也做过这题? 每次都是模拟32位运算然后遇到负数就搞不定了。。。参考别人的做法。
算法:
public int getSum(int a, int b) {
int c = 0;
while(b!=0){
c= a^b; //add
b = (a&b)<<1;//carry
a =c;
}
return a;
}
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