Counting Instances of Each Word in a Text File - C++ File Stream

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Description

Counting Instances of Each Word in a Text File

Demo Code

#include <iostream>
#include <fstream>
#include <map>
#include <string>

typedef std::map<std::string, int> StrIntMap;

void countWords(std::istream& in, StrIntMap& words) {

   std::string s;/* w  w  w  .  java 2 s. co  m*/

   while (in >> s) {
      ++words[s];
   }
}

int main(int argc, char** argv) {
   std::ifstream in("main.cpp");

   if (!in)
      exit(EXIT_FAILURE);

   StrIntMap w;
   countWords(in, w);

   for (StrIntMap::iterator p = w.begin();
        p != w.end(); ++p) {
      std::cout << p->first << " occurred "
                << p->second << " times.\n";
   }
}

Result


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