class Solution {
public:
int reverse(int x) {
int res = 0;
while (x != 0) {
int t = res * 10 + x % 10;
if (t / 10 != res) return 0;
res = t;
x /= 10;
}
return res;
}
};原文：http://www.cnblogs.com/wangkun1993/p/6358537.html