翻转单词顺序

 1 #include <string>
 2 #include "stdafx.h"
 3 
 4 void Reverse(char *pBegin, char *pEnd)
 5 {
 6     if(pBegin == NULL || pEnd == NULL)
 7         return;
 8     
 9     while(pBegin < pEnd)
10     {
11         char temp = *pBegin;
12         *pBegin = *pEnd;
13         *pEnd = temp;
14         
15         pBegin ++, pEnd --;
16     }
17 }
18 
19 char* ReverseSentence(char *pData)
20 {
21     if(pData == NULL)
22         return NULL;
23 
24     char *pBegin = pData;
25 
26     char *pEnd = pData;
27     while(*pEnd != ‘\0‘)
28         pEnd ++;
29     pEnd--;
30 
31     // 翻转整个句子
32     Reverse(pBegin, pEnd);
33 
34     // 翻转句子中的每个单词
35     pBegin = pEnd = pData;
36     while(*pBegin != ‘\0‘)
37     {
38         if(*pBegin == ‘ ‘)
39         {
40             pBegin ++;
41             pEnd ++;
42         }
43         else if(*pEnd == ‘ ‘ || *pEnd == ‘\0‘)
44         {
45             Reverse(pBegin, --pEnd);
46             pBegin = ++pEnd;
47         }
48         else
49         {
50             pEnd ++;
51         }
52     }
53 
54     return pData;
55 }
56 
57 
58 int main()
59 {
60     char input[] = "I am a student.";
61     printf("%s\n\n",input);
62     printf("After reverse.\n\n");
63     ReverseSentence(input);
64     printf("%s\n", input);
65     
66     return 0;
67 }