string - Counting how many times certain words show up in a text file in C++ -

i trying make program 2 different text files. 1 of them contains actual text want analyze , other contains list of words. program supposed check when word list shows in text , count that. here (non working) code have far:

#include <iostream> #include <string> #include <fstream>  using namespace std;  int main () {      string word1;     string word2;     int listhits = 0;      ifstream data1 ("text.txt");     if ( ! data1 ) {     cout << "could not open file: " << "text.txt" << endl;         exit ( exit_failure );   }      ifstream data2 ("list.txt");     if ( ! data2 ) {     cout << "could not open file: " << "list.txt" << endl;         exit ( exit_failure );   }      while ( data1 >> word1 ) {         while ( data2 >> word2 ) {             if ( word1 == word2 ) {                 listhits++;             }         }     }      cout << "your text had " << listhits << " words list " << endl;      system("pause");      return 0; } 

if text.txt contains

here text. loaded program.

and list.txt contains

will a

the expected outcome 3. however, no matter in text files program gives me answer 0. have checked program manages read files having count times loops, , works.

thanks in advance

it seems me you're comparing first letter of first file entire second file, do:

  while ( data1 >> word1 ) {         while ( data2 >> word2 ) { // <---- after ends first time, never enter again             if ( word1 == word2 ) {                 listhits++;             }         } 

you need "reset" data2 after second loop finished starts read again beginning of file:

 while ( data1 >> word1 ) {         while ( data2 >> word2 ) {             if ( word1 == word2 ) {                 listhits++;             }             }         data2.seekg (0, data2.beg);    }