[面试真题] LeetCode：Reverse Integer

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321

class Solution {
public:
    int reverse(int x) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        int sig = 1;
        if(x<0){
            sig = -1;
            x = -x;
        }
        int rtn = 0;
        while(x>0){
            rtn = rtn * 10 + x%10;
            x /= 10;
        }
        if(sig == -1){
            return -rtn;
        }
        return rtn;
    }
};

Run Status: Accepted!
Program Runtime: 56 milli secs

Progress: 1020/1020 test cases passed.