LeetCode#7 Reverse Integer

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321
click to show spoilers.

Note:
The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed integer overflows.
简单题，不解释。

class Solution {
public:
    int reverse(int x) {
        long result=0;
        while(x!=0)
        {
            result=result*10+x%10;
            if(result>(1<<31)-1||result<-(1<<31))return 0;
            x=x/10;
        }
        return (int)result;
    }
};