Code:
#include <iostream>
#include <string>
#include <string.h>
#include <fstream>
#include <vector>
#include <cstdlib> // exit()
#include <cctype>  // isalpha(), tolower()

using namespace std;

void readByString(std::string f1, std::string f2, std::string f3){
    int count = 0;
    if(f1 == f2)
    count++;
    if(count > 0)
        cout << f1 << " " << f2 << endl << f3 << endl;

}

int main()
{
    std::ifstream fin("file_in.txt");
    std::ofstream fout("file_out.txt");
    std::ifstream fin2("file_in_2.txt");
    std::ofstream fout2("file_out_2.txt");
    if (!fin || !fout ||!fin2 || !fout2) { std::cerr<<"file error\n"; std::exit(1); }

    string temp3;

    while( getline( fin2, temp3 ) ){
        float c_;
        bool word = false;
        char letters[] = "abcdefghijklmnopqrstuvwxyz";
        char *this_letter;

        while ((c_ = fin.get()) != EOF) {
            if (c_ == '\'') continue; // skip apostrophe
            if (std::isalpha(c_)) {
                if ((this_letter = strchr(letters, tolower(c_))) != NULL){
                    fout << this_letter[0];
                }
                    word = true;
            }
                    else if (word) {
                        fout<<'\n';
                        word = false;
                    }
        }
        fout.close();
        fin.close();
        float c_2;
        bool word2 = false;
        char letters2[] = "abcdefghijklmnopqrstuvwxyz";
        char *this_letter2;

        while ((c_2 = fin2.get()) != EOF) {
            if (c_2 == '\'') continue; // skip apostrophe
            if (std::isalpha(c_2)) {
                if ((this_letter2 = strchr(letters2, tolower(c_2))) != NULL){
                    fout2 << this_letter2[0];
                }
                word2 = true;
            }
            else if (word2) {
                fout2<<'\n';
                word2 = false;
            }
        }
        fout2.close();
        fin2.close();

        ifstream ifs ("file_out.txt");
        ifstream ifs2 ("file_out_2.txt");
        std::ifstream ifs3("file_in_2.txt");
        if (!ifs || !ifs2) { std::cerr<<"file error\n"; std::exit(1); }

        int j = 0;
        vector<string> text_file;
        string temp;
        vector<string> text_file2;
        string temp2;
        vector<string> text_file4;
        string temp4;

        if(ifs.is_open()){
            while( getline( ifs3, temp4 ) ){
                while( getline( ifs, temp ), getline( ifs2, temp2 ), getline( ifs3, temp4 ) ){
                for (j = 0; temp[j] != '\0'; j++)
                temp[j] = tolower(temp[j]);
                readByString(temp, temp2, temp4);
                text_file.push_back( temp );
                text_file2.push_back( temp2 );
                }
            text_file4.push_back( temp4 );
            }
            ifs.close();
            ifs2.close();
            ifs3.close();
        }
    }
}
The text in file_in.txt;
zeethe price is right

The text in file_in_2.txt;
a blue budgie
zeethe price is alright

Here are the console results;

zeethe zeethe
zeethe price is alright
price price

is is


Process returned 0 (0x0) execution time : 0.125 s
Press any key to continue.

___________________


I want to test for more than one word. So in the readByString function I want to test if (count > 1), but when I use 1 instead of 0 the results fail.
Right now it looks for the word "zeethe", but I want to find "price" too.

I have been busy googling and trying to do this for about a day now, please help me.