问题：Reverse digits of an integer.
Example1:x = 123, return 321
Example2:x = -123, return -321
Note:
The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed integer overflows.
分析：输入为int，输出也同为int，需要做的是将原来的int做一个reverse，并且要注意有“-”存在的情况。
结果并不对，回过头检查发现note里有重要的信息：The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed integer overflows.”
32位头符号整数：32位计算机字长,用于表示整数,共有2的32平方个.范围是：-2147483648~2147483648
因此修改代码如下：
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