// This program writes data to a file.
// Converting string to c_str.
#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;

int main()
{
    ofstream outfile;   // instantiate file pointer object
    string filename;    // used to store filename to save file

    // get filename from user
    cout << "Enter the filename to store the file in\n"
         << "> ";
    cin >> filename;

    outfile.open(filename);            // associate file with file pointer object
    //outfile.open(filename.c_str());  // convert filename to C-string in pre-C++11

    if (!outfile)
    {
        cout << "Error opening file." << endl;
        return 1;  // exit program with an error code
    }

    cout << "Writing to the file ... ";

    outfile << "KCMP\t" << 89.3 << endl;
    outfile << "KNOW\t" << 91.1 << endl;
    outfile << "KSJN\t" << 99.5 << endl;
    outfile.close();    // close the file!

    cout << "Done!" << endl;

    return 0;
}