#include <iostream>
#include <fstream>
#include <conio.h>

using std::cin;
using std::cout;

using std::ofstream;
using std::ifstream;
using std::fstream;
using std::ios;

struct record
	{
		int idno;
		char name[10];
		char surname[15];
		float gpa;
	};

typedef struct record Record;


void main()
	{
		fstream datafile("C:/Temp/Student.dat", ios::in|ios::out|ios::binary);
		Record rec={0,"","",0.0};
		int number;

		cout << "Enter ID Number : ";
		cin >> number;
		
		//Move the Read/Write head
		datafile.seekg((number - 100) * sizeof(Record));

		//Read from the RAF where the Read/Write head has been positioned
		datafile.read(reinterpret_cast <char *>(&rec), sizeof(Record));
		
		cout << rec.idno <<"\t" << rec.name <<"\t" << rec.surname
			 <<"\t" << rec.gpa <<"\n";

		//Prompt the user to rename the Surname
		cout << "Enter new Surname : ";
		cin >> rec.surname;

		//Move the Read/Write head
		datafile.seekp((number - 100) * sizeof(Record));

		//Read from the RAF where the Read/Write head has been positioned
		datafile.write(reinterpret_cast <char *>(&rec), sizeof(Record));

		datafile.close();

		getch();
	}





/*
void main()
	{
		ofstream outfile("C:/Temp/Student.dat", ios::binary);
		ifstream infile("C:/Temp/Student.txt");
		Record rec;

		//Get data from the keyboard and insert into outfile
		while (infile >> rec.idno >> rec.name >> rec.surname >> rec.gpa)
			{
				//Move the Read/Write head
				outfile.seekp((rec.idno - 100) * sizeof(Record));

				//Write to the RAF
				outfile.write(reinterpret_cast <char *>(&rec), sizeof(Record));
			}
		outfile.close();
		infile.close();

		getch();
	}
*/
/*
void main()
	{
		ifstream infile("C:/Temp/Student.dat", ios::binary);
		Record rec;

		//Get data from the keyboard and insert into outfile
		while (infile)
			{
				//Reading from the RAF
				infile.read(reinterpret_cast <char *>(&rec), sizeof(Record));
			
				//Display the record on the screen	
				if (rec.idno > 0)
					cout << rec.idno <<"\t" << rec.name <<"\t" << rec.surname
						 <<"\t" << rec.gpa <<"\n";

			}
		infile.close();

		getch();
	}

*/


/*

void main()
	{
		ofstream outfile("C:/Temp/Student.dat", ios::binary);
		ofstream outfileTxt("C:/Temp/Student.txt");
		Record rec;

		//Get data from the keyboard and insert into outfile
		for (int x = 0; x < 20; x++)
			{
				cout << "Enter ID, Name, Surname and GPA for record "
					<< x+1 << " of 20 : ";
				
				cin >> rec.idno >> rec.name >> rec.surname >> rec.gpa;

				//Write to the RAF
				outfile.write(reinterpret_cast <char *>(&rec), sizeof(Record));

				//Write to the TEXT file
				outfileTxt << rec.idno <<"\t" << rec.name <<"\t" << 2rec.surname
					       <<"\t" << rec.gpa <<"\n";

			}
		outfile.close();
		outfileTxt.close();

		getch();
	}

*/