Reverse Integer

Reverse Integer

leetcode

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Title

题目链接

1. Reverse digits of an integer.
2. Example1: x = 123, return 321
3. Example2: x = -123, return -321

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Code

1. class Solution {
2. public:
3. int reverse(int x) {
4. // may be overflow when inverse the input
5. long long base = 1L;
6. int Max_Int = (int)((base << 31) - 1);
7. int Min_Int = (int)(0 - (base << 31));
9. long long res = 0;
10. while(x != 0) {
11. res = res * 10 + (x % 10);
12. x = x / 10;
13. }
15. if(res > Max_Int || res < Min_Int) {
16. return 0;
17. }
19. return (int)res;
20. }
22. };

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