7. Reverse Integer

Reverse digits of an integer.

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

主要要考虑溢出处理。

class Solution {
public:
    int reverse(int x) {
        int max =  2147483647;  //int最大值
        int min = -2147483648; //int最小值
        
        long long ret = 0;
        while(x!=0){
            int temp = x % 10;
            ret = ret*10 + temp;
            
            //溢出处理
            if(ret > max || ret < min){
                return 0;
            }
            
            x = x /10;
            
        }
        return (int)ret;
    }
};