C++ Templates and the STL

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#include<iostream>

#include<fstream>

using namespace std;

// define a class to store student data

class student

{

   int roll;

   char name[30];

   float marks;

public:

   student() { }

   void getData(); // get student data from user

   void displayData(); // display data

};

void student :: getData()

 {

   cout << "\nEnter Roll No. :: ";

   cin >> roll;

   cin.ignore(); // ignore the newline char inserted when you press enter

   cout << "\nEnter Name :: ";

   cin.getline(name, 30);

   cout << "\nEnter Marks :: ";

   cin >> marks;

}

void student :: displayData()

{

   cout << "\nRoll No. :: " << roll << endl;

   cout << "\nName :: " << name << endl;

   cout << "\nMarks :: " << marks << endl;

}

int main()

{

   student s[3]; // array of 3 student objects

   fstream file;

   int i;

   file.open("calculations.txt", ios :: out); // open file for writing

    cout << "\nWriting Student information to the file :- " << endl;

    cout << "\nEnter 3 students Details to the File :- " << endl;

   for (i = 0; i < 3; i++)

    {

      s[i].getData();

      // write the object to a file

      file.write((char *)&s[i], sizeof(s[i]));

    }

   file.close(); // close the file

   file.open("calculations.txt", ios :: in); // open file for reading

   cout << "\nReading Student information to the file :- " << endl;

   for (i = 0; i < 3; i++)

    {

      // read an object from a file

      file.read((char *)&s[i], sizeof(s[i]));

      s[i].displayData();

    }

   file.close(); // close the file

   return 0;

}