替换空格

#include "stdafx.h"
#include <iostream>
#include <exception>
using namespace std;

/*替换空格*/
/*
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".
*/
int ReplaceBlank(char string[],int length)
{
    int i = 0;
    int blankNum=0;
    int strLength=0;
    while(string[i]!='')
    {
        strLength++;
        if(string[i] == ' ')
        {
            blankNum++;
        }
        ++i;
    }
    int endIndex = strLength+blankNum*2;
    if(endIndex > 99)
    {
        cout<<"数组长度不够!"<<endl;
        return 0;
    }
    while(strLength>=0 && endIndex>strLength)
    {
        if(string[strLength] != ' '){
            string[endIndex] = string[strLength];
            endIndex--;
        }
        else
        {
            string[endIndex--]='0';
            string[endIndex--]='2';
            string[endIndex--]='%';
        }
        strLength--;
    }
    return 1;

} 
int _tmain(int argc, _TCHAR* argv[])
{ 
    char str[100]="hello w o  rld";
    ReplaceBlank(str,100);
    cout<<str<<endl;
    return 0 ;
}