输入文件路径，则打印出文件中的内容，每行打印出每个单词

#include
#include
#include
#include
using namespace std;

istream& get(istream& in)
{
 int ival;
 while(in >> ival, !in.eof())
 {
  if(in.bad())
   throw runtime_error("IO stream corrupted");
  if(in.fail())
  {
   cerr << "bad data , try again";
   in.clear();
   in.ignore(20,' ');
   continue;
  }
  cout << ival <<" ";
 }
 in.clear();
 return in;
}

void process(string s)
{
 cout << s.c_str() < }

void main()
{
 fstream input;
 vector files;
 string fileName,s;
 int ival;
 cout << "Enter filenames:(ctrl+z to end)"<  do
 {
  cin >> fileName;
  files.push_back(fileName);
  cout << "按1继续添加：";
  
  cin >> ival;
 }while(ival == 1);
 vector::const_iterator it = files.begin();
 
 while(it != files.end())
 {
  input.open(it->c_str());
  if(!input)
  {
   cerr << "error: can not open file:"
    << *it << endl;
   input.clear();
   ++it;
  }
  else
  {
   while(input >> s)
   {
    process(s);
   }
   input.close();
   input.clear();
   ++it;
  }
 }

}