7. Reverse Integer (java)

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7. Reverse Integer

Description Submissions Solutions

Total Accepted: 226209
Total Submissions: 943942
Difficulty: Easy
Contributor: LeetCode

Reverse digits of an integer.

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

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Note:
The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed integer overflows.

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题目链接：https://leetcode.com/problems/reverse-integer/#/description

这题主要就是纪录一下java 中 integer的最大值和最小值可以直接调用：Integer.MAX_VALUE 和 Integer.MIN_VALUE，值分别为：2147483647 -2147483648

public class Solution {
    public int reverse(int x) {
        long ans = 0;
        while(x!=0){
            int cur = x % 10;
            ans = ans*10 + cur;
            x /= 10; 
        }
        if(ans > Integer.MAX_VALUE || ans < Integer.MIN_VALUE){
            return 0;
        }
        return (int)ans;
    }
}