替换空格

 1 #include "stdafx.h"
 2 #include <iostream>
 3 #include <exception>
 4 using namespace std;
 5 
 6 /*替换空格*/
 7 /*
 8 题目:请实现一个函数,把字符串中的每个空格替换成"%20".例如输入"We are happy",则输出"We%20are%20happy".
 9 */
10 int ReplaceBlank(char string[],int length)
11 {
12     int i = 0;
13     int blankNum=0;
14     int strLength=0;
15     while(string[i]!='')
16     {
17         strLength++;
18         if(string[i] == ' ')
19         {
20             blankNum++;
21         }
22         ++i;
23     }
24     int endIndex = strLength+blankNum*2;
25     if(endIndex > 99)
26     {
27         cout<<"数组长度不够!"<<endl;
28         return 0;
29     }
30     while(strLength>=0 && endIndex>strLength)
31     {
32         if(string[strLength] != ' '){
33             string[endIndex] = string[strLength];
34             endIndex--;
35         }
36         else
37         {
38             string[endIndex--]='0';
39             string[endIndex--]='2';
40             string[endIndex--]='%';
41         }
42         strLength--;
43     }
44     return 1;
45 
46 } 
47 int _tmain(int argc, _TCHAR* argv[])
48 { 
49     char str[100]="hello w o  rld";
50     ReplaceBlank(str,100);
51     cout<<str<<endl;
52     return 0 ;
53 }