C++ primer 統計單詞個數

#include<map>
#include<iostream>
#include<algorithm>
#include<string>
#include<sstream>
#include<fstream>
#include<ctime>
using namespace std;

int main()
{ map<string,int> word_count;
  ifstream infile;
  string filename;
  char line[256];
 
  cout << "Input the fliename of source" << endl;  //Input the location of file
  cin >> filename;
  infile.open(filename.c_str(),ios::in);  
  cout << "The file is processing ..." << endl;
  starts = time(&starts);
  while(infile.getline(line,256,'\n'))    //read line from file and process 
  { string word;
    istringstream str(line);
    while(str >> word)
    {
          ++word_count[word];
    }  
   } 
   
 
   for(map<string, int>::iterator it = word_count.begin(); it != word_count.end(); ++it )  // out
        cout << "The word is "<< it->first<<" the count is "<<it->second<<endl; 
   cout << "It takes "<< ends - starts <<" minutes" << endl;     
  system("pause");      
  return 0;    
}

總結：無。