本文探讨了如何在一个仅能存储32位有符号整数的环境中翻转整数的数字。通过去除符号和尾部的零，并考虑整数范围及边界值，确保翻转后的整数不会溢出。
Given a 32-bit signed integer, reverse digits of an integer.
Example 1:
Input: 123 Output: 321
Example 2:
Input: -123 Output: -321
Example 3:
Input: 120 Output: 21
Note:
Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range: [−231, 231 − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.
思路：先把符号去掉，接着把整型后面的0去掉，接着考虑整型的范围，尤其是边界值的情况
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