替换空格

 1 class Solution {
 2 public:
 3     void replaceSpace(char *str,int length) {
 4             if(length > 0)
 5         {
 6             int space_count = 0;
 7             int i;
 8             for (i = 0;i < length;++i)
 9             {
10                 if(str[i] == ‘ ‘)
11                 {
12                     ++ space_count;
13                 }
14             }
15             int left = i ,right = i + space_count * 2;
16             while(left >= 0)
17             {
18                 if(str[left] == ‘ ‘)
19                 {
20                     str[right--] = ‘0‘;
21                     str[right--] = ‘2‘;
22                     str[right--] = ‘%‘;
23                     -- left;
24                 }
25                 else
26                 {
27                     str[right--] = str[left--];
28                 }
29             }
30         }
31     }
32 };