C++实现英文句子中的单词逆序输出的方法

#include "stdafx.h"
#include <iostream>
#include <string>
#include <stack>
using namespace std;
int main(int arc, char** argv)
{
 string str="I come from liaoning.";
 stack<string> works;
 int len=str.length();
 while(1)
 {
  int start=str.find_first_not_of(" ");
  int end=str.find_first_of(" ");
  int wlen=end-start;
  if(end!=-1)
  {
   string temp=str.substr(start,wlen);
   works.push(temp);
  }
  else
  {
   works.push(str);
   break;
  }
  str=str.substr(end+1,len-wlen);
 }
 while(!works.empty())
 {
  string temp=works.top();
  cout<<temp<<" ";
  works.pop();
 }
 cout<<endl;
 system("pause");
 return 0;
}