7.整数反转

7.整数反转

方法一

class Solution:
    def reverse(self, x):
        """
        :type x: int
        :rtype: int
        """
        
        flag = 0
        if x < 0:
            flag = 1
            x = abs(x)
        res = 0
        while x > 0:
            res = res * 10
            temp = x % 10
            res += temp
            x = x // 10
        if res < (-2) ** 31 or res > (2) ** 31 -1:
            return 0
        if flag == 1:
            return -res
        return res