LeetCode: 371 Sum of Two Integers(easy)
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.
代码:
使用移位来计算,用异或求不带进位的和,用与并左移1位来算进位,然后将两者相加。
class Solution {
public:
int getSum(int a, int b) {
return b == ? a : getSum(a^b, (a&b)<<);
}
};
什么样的数据可以直接移位? char、 short、 int、 long、 unsigned char、 unsigned short、 unsigned int、 unsigned long
什么样的数据不能直接移位? double、 float、 bool、 long double
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