《剑指offer》替换空格

#include <iostream>

using namespace std;

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

  int originalLength=0;
  int numberOfBlank=0;
  int i=0;
  while(str[i]!=‘\0‘)
  {
    originalLength++;
    if(str[i]==‘ ‘)
            ++numberOfBlank;
    ++i;
  }

  int newLength=originalLength+numberOfBlank*2;
  if(newLength>length)
    return;

  int indexOfOrignal=originalLength;
  int indexOfNew = newLength;

  while(indexOfOrignal>=0&&indexOfNew>indexOfOrignal)
  {
    if(str[indexOfOrignal]==‘ ‘)
    {
        str[indexOfNew--]=‘0‘;
        str[indexOfNew--]=‘2‘;
        str[indexOfNew--]=‘%‘;
    }
    else{
        str[indexOfNew--]=str[indexOfOrignal];
    }
    --indexOfOrignal;
  }

}
int main()
{
    char str[30]="we are happy!";
    replaceBlank(str,30);
    cout<<str<<endl;
    return  0;
}