// diskfun.cpp
// reads and writes several objects to disk
#include <fstream>                //for file streams
#include <iostream>
using namespace std;
////////////////////////////////////////////////////////////////
class person                      //class of persons
   {
   protected:
      char name[80];              //person's name
      int age;                    //person's age
   public:
      void getData()              //get person's data
         {
         cout << "\n   Enter name: "; cin >> name;
         cout << "   Enter age: "; cin >> age;
         }
      void showData()             //display person's data
         {
         cout << "\n   Name: " << name;
         cout << "\n   Age: " << age;
         }
   };
////////////////////////////////////////////////////////////////
int main()
   {
   char ch;
   person pers;                   //create person object
   fstream file;                  //create input/output file
                                  //open for append
   file.open("GROUP.DAT", ios::app | ios::out |
                                      ios::in | ios::binary );
   do                             //data from user to file
      {
      cout << "\nEnter person's data:";
      pers.getData();             //get one person's data
                                  //write to file
      file.write( reinterpret_cast<char*>(&pers), sizeof(pers) );
      cout << "Enter another person (y/n)? ";
      cin >> ch;
      }
   while(ch=='y');                //quit on 'n'
   file.seekg(0);                 //reset to start of file
                                  //read first person
   file.read( reinterpret_cast<char*>(&pers), sizeof(pers) );
   while( !file.eof() )           //quit on EOF
      {
      cout << "\nPerson:";        //display person
      pers.showData();            //read another person
      file.read( reinterpret_cast<char*>(&pers), sizeof(pers) );  
      }
   cout << endl;
   return 0;
   }

// This uses classes and STL to manage a listing of courses.
// Created by:
// Created: 5/3/07
// Modified: 5/4/07
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>
#include <iterator>
#include <functional> // (?)
using namespace std;
 
struct cinfo { //holds course info
   string prefix;
   int number;
   string title;
   int credits;
   char grade;
};
 
class course {
   private:
       string prefix;
       int number;
       string title;
       int credits;
       char grade;
   public:
      //Constructors
      course();
      course(string, int, string, int, char);
      course(cinfo in);
      //Accessors
      void set();
      void print() const;
      string get_prefix() const;
      int get_number() const;
      string get_title() const;
      int get_credits() const;
      char get_grade() const;
      cinfo get_info() const;
      //Operators
      bool operator < (course) const;
      bool operator > (course) const;
      course operator = (course);
      bool operator == (course) const;
      bool operator == (int n) const;
      bool operator != (course) const; 
}; 
 
//class functions...
//indenting below is a little screwed up, my bad
 
int main()
{
   vector<course> cache; //holds courses in memory
   vector<course>::iterator point; //points at the cache
   cinfo temp        //buffer struct
   course *buffer; //buffer class
   fstream file;//for file I/O
 
  //stuff happens
 
 file.open("Courses.dat", ios::out | ios::trunc | ios::binary);
   temp = one.get_info();
   file.write(reinterpret_cast<char *>(&temp), sizeof(temp));
   temp = two.get_info();
   file.write(reinterpret_cast<char *>(&temp), sizeof(temp));
   temp = three.get_info();
   file.write(reinterpret_cast<char *>(&temp), sizeof(temp));
   file.close();
 
 
 
cout << "Saving to file..." << endl;
file.open("Courses.dat", ios::out | ios::trunc | ios::binary);
file.clear();
for(point = cache.begin(); point != cache.end(); point++) {
   temp = point->get_info();
   file.write(reinterpret_cast<char *>(&temp), sizeof(temp));
   file.clear();
}     
file.close();//close file
 
 
 
 cout << "Loading file..." << endl;
 file.open("Courses.dat", ios::in | ios::binary);
 file.clear();
 file.read(reinterpret_cast<char *>(&temp), sizeof(temp));
 while (!file.eof()) {  //read in file
     buffer = new course(temp);
     cache.push_back(*buffer);//place object in cache
     delete buffer;
     file.read(reinterpret_cast<char *>(&temp), sizeof(temp));
}
file.close();

// Convert this to a pipe delimited string
const string course::serialize()
{
  stringstream out;
 
  out<< prefix <<'|'<< number <<'|'<< title <<'|'<< credits <<'|'<< grade;
 
  return out.str();
}

file<< pers.serialize();