007，Reverse Integer
2018-10-08 本文已影响0人
丹之
https://leetcode.com/problems/reverse-integer/description/
Given a 32-bit signed integer, reverse digits of an integer.
Example 1:
Input: 123 Output: 321
Example 2:
Input: -123 Output: -321
Example 3:
Input: 120 Output: 21
https://leetcode.com/problems/reverse-integer/discuss/4056/Very-Short-(7-lines)-and-Elegant-Solution
public int reverse(int x) {
long rev= 0;
while( x != 0){
rev= rev*10 + x % 10;
x= x/10;
if( rev > Integer.MAX_VALUE || rev < Integer.MIN_VALUE)
return 0;
}
return (int) rev;
}
