// Illustrates output formatting instructions.
// Reads all the numbers in the file rawdata.dat and writes the numbers
// to the screen and to the file neat.dat in a neatly formatted way.
//
// C:\cs2>type rawdata.dat
// 1.5 -21
// 4 8 -8.865   -91.91919191
//
// C:\cs2>format
//     +1.50000
//    -21.00000
//     +4.00000
//     +8.00000
//     -8.86500
//    -91.91919
//
#include <iostream.h>
#include <fstream.h>
#include <stdlib.h>
#include <iomanip.h>

void make_neat(ifstream&, ofstream&, int, int);

void main()
{   ifstream fin;
    ofstream fout;

    fin.open("rawdata.dat");
    if (fin.fail())
    {   cout << "Input file opening failed.\n";
        exit(1);
    }

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

    make_neat(fin, fout, 5, 12);

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

//Uses iostream.h, fstream.h, and iomanip.h.
void make_neat(ifstream& messy_file, ofstream& neat_file,
               int number_after_decimalpoint, int field_width)
{   neat_file.setf(ios::fixed);
    neat_file.setf(ios::showpoint);
    neat_file.setf(ios::showpos);
    neat_file.precision(number_after_decimalpoint);
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.setf(ios::showpos);
    cout.precision(number_after_decimalpoint);

    double next;
    while (messy_file >> next)
    {
        cout << setw(field_width) << next << endl;
        neat_file << setw(field_width) << next << endl;
    }
}