LeetCode 7

Reverse Integer

Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
 1 /*************************************************************************
 2     > File Name: LeetCode007.c
 3     > Author: Juntaran 
 4     > Mail: Jacinthmail@gmail.com
 5     > Created Time: 2016年04月24日 星期日 17时03分19秒
 6  ************************************************************************/
 7 
 8 /*************************************************************************
 9 
10     Reverse Integer
11     
12     Reverse digits of an integer.
13 
14     Example1: x = 123, return 321
15     Example2: x = -123, return -321
16 
17  ************************************************************************/
18  
19 #include <stdio.h>
20 #include <limits.h>
21 
22 int reverse(int x){
23 
24     long int result = 0;
25 
26     /* 取出数字 */
27     int p = x>0 ? x : -x;
28     
29     /* Reverse */
30     while( p != 0 ){
31         result = result*10 + p%10;
32         p = p/10;
33     }
34     
35     /* 添加符号 */
36     result = (x>0) ? result : -result;
37     
38     /* 判断溢出 */
39     if( result > INT_MAX || result < INT_MIN ){
40         return 0;
41     }else{
42         printf("%d
",result);
43         return result;
44     }
45 }
46 
47 int reverse1(int x){
48     
49     long result = 0;
50     while(x != 0){
51         result = result * 10 + x % 10;
52         x = x/10;
53     }
54     if( result > INT_MAX || result < INT_MIN ){
55         return 0;
56     }
57     printf("%d
",result);
58     return (int)result;
59 }
60 
61 int main(){
62     int x = -15984;
63     reverse(x);
64     reverse1(x);
65 }