leetcode -- Reverse Integer

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <cmath>
using namespace std;

class Solution {
public:
int reverse(int x) {
int length = 0;
int result = 0;
int temp = abs(x);
bool isNeg = x >= 0 ? false : true;
while(temp)
{
temp = temp / 10;
++length;
}
temp = abs(x);
int temp2;
for(int i = 1; i <= length; ++i)
{
temp2 = temp;
int moshu = pow(10, i);
int chushu = pow(10, i - 1);
temp2 = (temp2 % moshu) / chushu;
result += temp2 * pow(10, length - i);
}
if(isNeg)
{
result = -result;
}
return result;
}
};

int main()
{
Solution s;
int r = s.reverse(0);
cout<<r<<endl;
return 0;
}