// File Name: neatify (Display 05-06.cpp)
// Illustrates output formatting instructions.
// Read all the numbers in the file rawdata.dat and write the numbers
// to the screen and to the file neat.dat in a neatly formatted way.
#include <iostream> // for cout
#include <fstream>  // for I/O member functions
#include <cstdlib>  // for the exit function
#include <iomanip>  // for the setw function
using namespace std;

void make_neat(ifstream& messy_file, ofstream& neat_file,
             int number_after_decimalpoint, int field_width);

int main() {
    ifstream fin;
    ofstream fout;

    fin.open("rawdata.txt");
    if( fin.fail() ) {  // oops the file did not exist for reading?
        cout << "Input file opening failed." << endl;
        exit(1);
    }

    fout.open("neat.dat");
    if( fout.fail() ) { // oops the output file open failed!
        cout << "Output file opening failed.\n";
        exit(1);
    }

    make_neat(fin, fout, 5, 12);

    fin.close( );
    fout.close( );

    cout << "End of program." << endl;
    return 0;
}

// Uses iostreams, streams to the screen, and iomanip:
void make_neat(ifstream& messy_file, ofstream& neat_file,
              int number_after_decimalpoint, int field_width) {

    // set the format for the neater output file.
    neat_file.setf(ios::fixed);
    neat_file.setf(ios::showpoint);
    neat_file.setf(ios::showpos);
    neat_file.precision(number_after_decimalpoint);

    // set the format for the output to the screen too.
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.setf(ios::showpos);
    cout.precision(number_after_decimalpoint);

    double next;
    while( messy_file >> next ) {  // while there is still stuff to read
        cout << setw(field_width) << next << endl;
        neat_file << setw(field_width) << next << endl;
    }
}