gistfile1.txt

#include <iostream>
#include <fstream>
#include <cstring>
#include <string>
using namespace std;

struct studentInfo
{
	char name[20];
	int age;
	float gpa;
	char grade;
};

int main()
{
	//Create an array of student info
	studentInfo students[4] = {
		{ "Ann Annson", 10, 1.10, 'D' },
		{ "Bill Billson", 20, 2.20, 'C' },
		{ "Carl Carlson", 30, 3.30, 'B' },
		{ "Don Donson", 40, 4.00, 'A' },
	};

	//We need two files, just use fstream since we're inputting and outputting as well
	fstream oFile1, oFile2;

	//Write array into a text file
	oFile1.open("students.txt", ios::out);
	for (int i = 0; i < 4; i++)
	{
		oFile1 << students[i].name << "  ";
		oFile1 << students[i].age << "  ";
		oFile1 << students[i].gpa << "  ";
		oFile1 << students[i].grade << "   " << endl;
	}
	oFile1.close(); //Remember to close it 

	//Write array into a binary file
	oFile2.open("students.bin", ios::out || ios::binary);
	oFile2.write(reinterpret_cast<char*>(&students), sizeof(students));
	oFile2.close();

	//Declare two new arrays; studentsText, studentsBinary
	studentInfo studentsText[4], studentsBinary[4];

	//Read data from students.txt into studentsText
	oFile1.open("students.txt", ios::in);
	for (int i = 0; i < 4; i++)
	{
		oFile1.getline(studentsText[i].name, 20);
		oFile1 >> studentsText[i].age;
		oFile1 >> studentsText[i].gpa;
		oFile1 >> studentsText[i].grade;
		oFile1.ignore();
	}
	oFile1.close(); //Remember to close it 


	//Display the studentsText array
	for (int i = 0; i < 4; i++)
	{
		cout << studentsText[i].name << "   ";
		cout << studentsText[i].age << "   ";
		cout << studentsText[i].gpa << "   ";
		cout << studentsText[i].grade << "   ";
		cout << endl;
	}

	//Get stuff for binary
	oFile2.open("students.bin", ios::in | ios::binary);
	oFile2.read(reinterpret_cast<char *>(&studentsBinary), sizeof(studentsBinary));

	//Display from binary
	for (int i = 0; i < 4; i++)
	{
		cout << studentsBinary[i].name << "  ";
		cout << studentsBinary[i].age << "  ";
		cout << studentsBinary[i].gpa << "  ";
		cout << studentsBinary[i].grade << "   "; 
		cout << endl;
	}
	oFile2.close();

	int student;
	studentInfo sTemp;
	oFile2.open("students.dat", ios::in | ios::binary);
	cout << "Which sudent do you want to see? ";
	cin >> student;
	oFile2.seekg((student - 1) * sizeof(student), ios::beg);
	oFile2.read(reinterpret_cast<char *>(&sTemp), sizeof(sTemp));

	cout << sTemp.name << "  "
		<< sTemp.age << "  "
		<< sTemp.gpa << "  "
		<< sTemp.grade << endl;

	return 0;
}