Reverse Integer

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求一个整数的长度：

 int getLen(int x) {     int len = 0, t = x;     while (t)     {         t = t / 10;         len += 1;     }     return len; }

题目：
Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321
代码：

class Solution {public:    int reverse(int x) {        // Start typing your C/C++ solution below        // DO NOT write int main() function        int flag=true;        if(x<0)        {            flag=false;            x=-x;        }        int len = getLen(x);        int rst = 0;        for (int i = 1; i <= len; i++)        {            int t = x % 10;            x = x / 10;            int a = len - i, temp = 1;            while (a > 0)            {                temp = temp * 10;                a--;            }            rst += t * temp;        }        if(flag)   return rst;        else return -rst;    }    int getLen(int x)    {        int len = 0, t = x;        while (t)        {            t = t / 10;            len += 1;        }        return len;    }};

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