剑指offer——替换空格 C++编程

题目及解题思路见链接：
https://blog.csdn.net/l_xrui/article/details/51685552

代码如下：

#include <iostream>

using namespace std;

void ReplaceBlanks(char string[], int length)
{
    if(string==NULL||length<=0)
        return;

    int originallength=0;
    int numofBlanks=0;
    int i=0;
    while(string[i]!='\0')
    {
        ++originallength;
        if(string[i]==' ')
            ++numofBlanks;
        ++i;

    }

    int newlength=originallength+2*numofBlanks;
    if(newlength>length)
        return ;

    int IndexofOriginal=originallength;
    int IndexofNew=newlength;
    while(IndexofOriginal>=0&&IndexofNew>IndexofOriginal)
    {
        if(string[IndexofOriginal]==' ')
        {
            string[IndexofNew--]='0';
            string[IndexofNew--]='2';
            string[IndexofNew--]='%';
        }
        else
        {
            string[IndexofNew--]=string[IndexofOriginal];
        }
        --IndexofOriginal;
    }
}


int main()
{
    char mystring[]="Are You Happy ?";
    ReplaceBlanks(mystring, 1000);
    cout << mystring << endl;
    return 0;
}