[leetcode]Reverse Integer
2015-05-02 15:37
393 查看
Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
click to show spoilers.
Have you thought about this?
Here are some good questions to ask before coding. Bonus points for you if you have already thought through this!
If the integer's last digit is 0, what should the output be? ie, cases such as 10, 100.
Did you notice that the reversed integer might overflow? Assume the input is a 32-bit integer, then the reverse of 1000000003 overflows. How should you handle such cases?
For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.
Example1: x = 123, return 321
Example2: x = -123, return -321
click to show spoilers.
Have you thought about this?
Here are some good questions to ask before coding. Bonus points for you if you have already thought through this!
If the integer's last digit is 0, what should the output be? ie, cases such as 10, 100.
Did you notice that the reversed integer might overflow? Assume the input is a 32-bit integer, then the reverse of 1000000003 overflows. How should you handle such cases?
For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.
public int reverse(int x) { int flag = 1; if (x < 0) { x = -x; flag = -1; } int result = 0; while (x != 0) { int remain = x % 10; x = x / 10; if (result > (Integer.MAX_VALUE - remain) / 10) { return 0; } result = result * 10 + remain; if (result < 0 || result > Integer.MAX_VALUE) { return 0; } } result = result * flag; return result; }
相关文章推荐
- 【leetcode】Reverse Integer(考虑溢出问题)
- Leetcode Reverse Integer
- 【LeetCode7】【Reverse Integer】java中整形正负表示的一些思考
- Leetcode 7 Reverse Integer 数论
- 《leetcode》reverse-integer
- leetcode: Reverse Integer
- leetcode 104: Reverse Integer
- 【leetcode】7—reverse integer
- LeetCode OJ Reverse Integer
- leetcode — reverse-integer
- LeetCode 第 7 题(Reverse Integer)
- LeetCode | Reverse Integer(翻转整数)
- LeetCode:Reverse Integer
- 【LeetCode 7: Reverse Integer】
- LeetCode:Reverse Integer
- LEETCODE: Reverse Integer
- Leetcode|Reverse Integer(string转char*总结)
- leetcode Reverse Integer 007
- Reverse Integer -- leetcode
- LeetCode 7 — Reverse Integer(C++ Java Python)