//as6.cpp
//CS010 Winter 2004

//This program takes student data from a file called raw.dat and outputs it 
//in a more readable format along with header information to a file called
//nice.dat.


#include<iostream>
#include<fstream>
#include<cstdlib>
#include<iomanip>

using namespace std;


struct Date
{
  int month;
  int day;
  int year;
};

struct StudentRecord
{
  int sid;
  double gpa;
  Date dob;
  int comp_units;
  int curr_units;
  Date grad;
};

void intro();
//precondition: none
//postcondition: An introduction to the program is output to the screen.


void getRecord(ifstream& fin, StudentRecord& student);
//preconditions: The parameter fin is connected to a file that has student 
//               records in raw form (just the data separated by whitespace).
//               fin should point to the beginning of a student's record.
//               The parameter student has been declared.
//postconditions: The parameter fin points to the next student's sid or end
//                of file.
//                The parameter student has all member variables initialized to
//                data from the file connected to fin. 


void outputRecord(ofstream& fout, StudentRecord& student);
//preconditions: The parameter fout is connected to a file that has its
//               header information and possibly some number of other student's
//               records already printed. fout should point to the beginning
//               of the next blank line.
//postconditions: The file connected to fout has the data from the parameter
//                student printed to it lined up with the header information.
//                fout now points to the beginning of the next line.


void outputHeader(ofstream& fout);
//precondition: The parameter fout is connected to the output file.
//postcondition: The header information has been printed to the output file.


int main()
{
  // used to pass StudentRecord object from input file to output file.
  StudentRecord next_student;    
                                 
  ifstream infile;
  ofstream outfile;

  int num_records;               
  char cont;

  intro();

  // Open input and output files and check for errors.
  // Exit the program if any file does not open.

  infile.open("raw.dat");
  if (infile.fail())
    {
      cout << "Error opening input file\n";
      exit(1);
    }

  outfile.open("nice.dat");
  if (outfile.fail())
    {
      cout << "Error opening output file\n";
      exit(1);
    }


  cout << "How many student records are in the input file, raw.dat?\n";
  cin >> num_records;


  // output header before entering loop that outputs all student records.

  outputHeader(outfile);


  // each iteration gets one student record from the input file and outputs it
  // to the output file.

  for (int i = 0; i < num_records; ++i)
    {
      getRecord(infile, next_student);
      outputRecord(outfile, next_student);
    }

  cout << "\nThe file nice.dat now holds the student records.\n\n";


  // close all open file objects

  infile.close();
  outfile.close();

  cout << "Press any key to continue\n";
  cin >> cont;

  return 0;

} // end main


void intro()
{
  cout << "\nThis program takes the raw student data from an input file named"
       << " raw.dat and outputs it in a more readable format to the file"
       << " nice.dat.\n\n";
}


void outputHeader(ofstream& fout)
{
  fout << " SID   GPA      DOB      Total Units  Current Units    Grad Date\n"
       << "----  ----  ----------   -----------  -------------   ----------\n";
}


void getRecord(ifstream& fin, StudentRecord& student)
{
  fin >> student.sid
      >> student.gpa
      >> student.dob.month 
      >> student.dob.day 
      >> student.dob.year
      >> student.comp_units
      >> student.curr_units
      >> student.grad.month 
      >> student.grad.day 
      >> student.grad.year;
}


void outputRecord(ofstream& fout, StudentRecord& student)
{
  // cause gpa to always output 2 digits after decimal point
  fout.setf(ios::fixed);
  fout.setf(ios::showpoint);
  fout.precision(2);

  // all data will output to right of given width by default
  fout << student.sid
       << setw(6) << student.gpa
       << setw(4) << student.dob.month 
       << '/'
       << setw(2) << student.dob.day 
       << '/'
       << setw(4) << student.dob.year
       << setw(9) << student.comp_units
       << setw(14) << student.curr_units
       << setw(11) << student.grad.month 
       << '/'
       << setw(2) << student.grad.day 
       << '/'
       << setw(4) << student.grad.year
       << endl;
}