Reverse Integer

难度：1

把123翻转成321

class Solution
{
public:
    int reverse(int x)
    {
        int sign=x>0?0:1;//0+1-
        x=abs(x);
        int ans=0;
        while(x)
        {
            ans=ans*10+x%10;
            x/=10;
        }
        return sign==0?ans:(-ans);
    }
};