LeetCode【7】.Reverse Integer--java实现

Reverse Integer

题目要求：给定一个int 类型值，求值的反转，例如以下：

Example1: x
= 123, return 321

     Example2: x = -123, return -321

简单问题一般蕴含细节的处理。思路非常easy，直接贴Java程序：

public class Solution {
    public int reverse(int x) {

        int head = x/10;
        int tail = x%10;
        long re = 0;

        while(head!=0||tail!=0)
        {
            re = re*10 + tail;
            tail = head%10;
            head = head/10;
        }

        re = re < Integer.MIN_VALUE? 0:re;
        re = re > Integer.MAX_VALUE?

0:re;

        return (int)re;
    }
}