1、在进入while之前,保证x是非负的;

2、符号还是专门用flag保存

===================

3、另一思路:将integer转换成string,然后首位swap,直至中间;

 class Solution:
# @return an integer
def reverse(self, x):
ret = 0
flag = 1
if x < 0:
flag = -1
x *= -1
while(x!=0):
ret = ret*10+x%10
x = x/10
return ret*flag

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