7. Reverse Integer

题目：Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321

public class Solution {
    public int reverse(int x) {
       // int flag;
       // if(x>=0)
       //    flag=1;
       // else
       //    flag=-1;
       //Stack s = new Stack();
        int max=0x7fffffff;
        int min=0x80000000;
       
        long s=0,t=0;
        while(x!=0)
        {
            t = x%10;
            s = 10*s+t;
            if(s>max||s0?max:min;  //若超过最大值或者最小值，则返回0
                 return 0;
              }
           
            x = x/10;
        }
        return (int)s;
    }
}