Read text from given text file and print into another text file all words starting with entered letter and row number where word was found in given file.

Enter from keyboard a letter. Read text from given text file and print into another text file all words starting with entered letter and row number where word was found in given file. 

#include <bits/stdc++.h>
using namespace std;

// driver code
int main()
{
    fstream file;

    // Input stream class to
    // operate on files.
    ifstream ifile("file.txt", ios::in);

    // Output stream class to
    // operate on files.
    ofstream ofile("file2.txt", ios::out | ios::app);

    // check if file exists
    if (!ifile.is_open()) {

        // file not found (i.e, not opened).
        // Print an error message.
        cout << "file not found";
    }
    else {
        // then add more lines to
        // the file if need be
        ofile << ifile.rdbuf();
    }
    string word;

    // opening file
    file.open("file2.txt");

    // extracting words form the file
    while (file >> word) {

        // displaying content of
        // destination file
        cout << word << " ";
    }

    return 0;
}