Sequential File Handling using CPP to store data of studenets

 Problem Statement:- Department maintains student information. The file contains the roll number, name, division and address. Allow user to add, and delete information of student. Display information about a particular student. If the record of the student does not exist an appropriate message is displayed. If it is, then the system displays the student details. Use the sequential file to maintain the data.

Note:- Scroll horizontally to see the full line of code.

#include <iostream>

#include <fstream>

#include <cstring>

#include <iomanip>

using namespace std;

const int MAX = 20;

class Student

{

    int rollno;

    char name[20], city[30];

    int div;

    int year;

public:

    Student()

    {

        strcpy(name, "");

        strcpy(city, "");

        rollno = year = div = 0;

    }

    Student(int rollno, char name[MAX], int year, int div, char city[MAX])

    {

        strcpy(this->name, name);

        strcpy(this->city, city);

        this->rollno = rollno;

        this->year = year;

        this->div = div;

    }

    int getRollNo()

    {

        return rollno;

    }

    void displayRecord()

    {

        cout << endl

             << setw(5) << rollno << setw(10) << name << setw(10)

             << year << setw(10) << div << setw(15) << city;

    }

};

//==========File Operations ===========

class FileOperations

{

    fstream file;

public:

    FileOperations(char *filename)

    {

        file.open(filename, ios::in | ios::out | ios::ate | ios::binary);

    }

    void insertRecord(int rollno, char name[MAX], int year, int div,

                      char city[MAX])

    {

        Student s1(rollno, name, year, div, city);

        file.seekp(0, ios::end);

        file.write((char *)&s1, sizeof(s1));

        file.clear();

    }

    void displayAll()

    {

        Student s1;

        file.seekg(0, ios::beg);

        while (file.read((char *)&s1, sizeof(s1)))

        {

            s1.displayRecord();

        }

        cout << endl;

        file.clear();

    }

    void searchRecord(int rollNo)

    {

        Student s1;

        file.seekg(0, ios::beg);

        bool flag = false;

        while (file.read((char *)&s1, sizeof(s1)))

        {

            if (s1.getRollNo() == rollNo)

            {

                s1.displayRecord();

                flag = true;

                break;

            }

        }

        cout << endl;

        if (flag == false)

        {

            cout << "\nRecord of " << rollNo << "is not present." << endl;

        }

        file.clear();

    }

    void deleteRecord(int rollno)

    {

        ofstream outFile("new.txt", ios::binary);

        file.seekg(0, ios::beg);

        bool flag = false;

        Student s1;

        while (file.read((char *)&s1, sizeof(s1)))

        {

            if (s1.getRollNo() == rollno)

            {

                flag = true;

                continue;

            }

            outFile.write((char *)&s1, sizeof(s1));

        }

        if (!flag)

        {

            cout << "\nRecord of " << rollno << "    is not present.";

        }

        file.close();

        outFile.close();

        remove("student.txt");

        rename("new.txt", "student.txt");

        file.open("student.txt", ios::in | ios::out | ios::ate | ios::binary);

        cout << "Record Deleted Successfully!!!" << endl;

    }

    ~FileOperations()

    {

        file.close();

        cout << "File Closed.";

    }

};

int main()

{

    ofstream newFile("student.txt", ios::app | ios::binary);

    newFile.close();

    FileOperations file((char *)"student.txt");

    int rollNo, year, choice, div;

    char name[MAX], address[MAX];

    char cont = 'y';

    while (cont == 'y')

    {

        cout << "<--------Menu-------->" << endl;

        cout << "1. Add New Records" << endl;

        cout << "2. Display All Records" << endl;

        cout << "3. Search the Record" << endl;

        cout << "4. Delete a Record" << endl;

        cout << "5. Exit" << endl;

        ;

        cout << "Enter choice : ";

        cin >> choice;

        switch (choice)

        {

        case 1:

            int n;

            cout << "Enter the number of records: ";

            cin >> n;

            for (int i = 0; i < n; i++)

            {

                cout << "\n -----------------------------------------\n";

                cout << "Enter the details of student: " << endl;

                cout << "Name: ";

                cin >> name;

                cout << "Division: ";

                cin >> div;

                cout << "Roll No. : ";

                cin >> rollNo;

                cout << "Year: ";

                cin >> year;

                cout << "Address: ";

                cin >> address;

                file.insertRecord(rollNo, name, year, div, address);

            }

            cout << "Records Inserted Successfully!!!" << endl;

            break;

        case 2:

            cout << endl

                 << setw(5) << "ROLL" << setw(10) << "NAME" << setw(10)

                 << "YEAR" << setw(10) << "DIV" << setw(15) << "CITY";

            file.displayAll();

            break;

        case 3:

            cout << "Enter Roll no. to be Searched: ";

            cin >> rollNo;

            cout << endl

                 << setw(5) << "ROLL" << setw(10) << "NAME" << setw(10)

                 << "YEAR" << setw(10) << "DIV" << setw(15) << "CITY";

            file.searchRecord(rollNo);

            break;

        case 4:

            cout << "Enter Roll no. to be deleted: ";

            cin >> rollNo;

            file.deleteRecord(rollNo);

            break;

        default:

            cout << "Invalid Choice!!!" << endl;

            break;

        }

        cout << "Do you want to continue ? (y/n) : ";

        cin >> cont;

    }

    cout << "Program Ended Successfully!!!" << endl;

    return 0;

}