leetcode 7 --- Reverse Integer

Reverse digits of an integer.

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

題目比較簡單，需注意一下幾點：

1.x爲負數

2.溢出

代碼如下：

class Solution {
public:
    int reverse(int x) {
        bool flag = false;
        if(x<0){
            flag = true;
            x = -x;
        }
        int result = 0;
        while(x!=0){
            
             if (result  > INT_MAX/10 || result < INT_MIN/10){
             return 0;
             }
             
            result = result * 10 + x%10;
             x = x/10;
        }
        
        if(flag){
            result = -result;
        }
        
        return result;
        
    }
};