DSAInnovative.cpp

#include <fstream>
#include <iostream>
#include <stdio.h>
#include <string.h>
 

using namespace std;
 

int main()
{

    // Considering the max length of data entered (name) to be 15.
    char data[15];

    int n = 0, option = 0, count_n = 0;

    // This is the initial mark allotted to a subject.

    string empty = "00";

    string proctor = "";

    // Name of the file in which DB is stored.

    ifstream f("Example.txt");

    string line;
 

    // The following for loop counts the total number of lines
    for (int i = 0; std::getline(f, line); ++i) {

        count_n++;

    }
 
    while (option != 6) {

        // This prints out all the available options in the

        // DB

        cout << "\nAvailable operations: \n1. Add New "

                "Students\n2."

             << "Student Login\n3. Faculty Login\n4. "

                "Proctor Login\n5. Admin View\n"

             << "6. Exit\nEnter option: ";

        cin >> option;
 

        if (option == 1) {

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

            cin >> n;
 

            count_n = count_n + n;
 

            for (int i = 0; i < n; i++) 
            {
                ofstream outfile;
                outfile.open("Example.txt", ios::app);
                cout << "Enter your registration number: ";
                cin >> data;

                outfile << data << "\t";
 

                cout << "Enter your name: ";

                cin >> data;

                int len = strlen(data);
 

                while (len < 15) {

                    data[len] = ' ';

                    len = len + 1;

                }

                outfile << data << "\t";


                outfile << empty << "\t";

                outfile << empty << "\t";
 

                cout << "Enter your proctor ID: ";

                cin >> proctor;
 

                outfile << proctor << endl;

            }

        }
 

        else if (option == 2) {

            char regno[9];

            cout << "Enter your registration number: ";

            cin >> regno;

            ifstream infile;

            int check = 0;

            infile.open("Example.txt", ios::in);


            while (infile >> data) {

                if (strcmp(data, regno) == 0) {

                    cout

                        << "\nRegistration Number: " << data

                        << endl;

                    infile >> data;

                    cout << "Name: " << data << endl;
 

                    infile >> data;

                    cout << "CSE1001 mark: " << data

                         << endl;
 

                    infile >> data;

                    cout << "CSE1002 mark: " << data

                         << endl;
 

                    infile >> data;

                    cout << "Proctor ID: " << data << endl;
 

                    infile.close();

                    check = 1;

                }

            }
 

            if (check == 0) {

                cout << "No such registration number found!"

                     << endl;

            }

        }
 
        else if (option == 3) {

            char subcode[7];

            cout << "Enter your subject code: ";

            cin >> subcode;

            string code1 = "CSE1001", code2 = "CSE1002",

                   mark = "";

            ifstream infile;

            int check = 0;
 

            cout << "\nAvailable operations: \n1. Add data "

                    "about marks\n"

                 << "2. View data\nEnter option: ";

            cin >> option;
 

            if (option == 1) {

                cout

                    << "Warning! You would need to add mark"

                    << "details for all the students!"

                    << endl;

                for (int i = 0; i < count_n; i++) {

                    fstream file("Example.txt");
 
                    if (strcmp(subcode, code1.c_str())

                        == 0) {

                        file.seekp(26 + 37 * i,

                                   std::ios_base::beg);

                        cout << "Enter the mark of student#"

                             << (i + 1) << " : ";

                        cin >> mark;

                        file.write(mark.c_str(), 2);

                    }
 

                    if (strcmp(subcode, code2.c_str())

                        == 0) {

                        file.seekp(29 + 37 * i,

                                   std::ios_base::beg);

                        cout << "Enter the mark of student#"

                             << (i + 1) << " : ";

                        cin >> mark;

                        file.write(mark.c_str(), 2);

                    }

                }

            }
 

            else if (option == 2) {

                infile.open("Example.txt", ios::in);

                if (strcmp(subcode, code1.c_str()) == 0) {

                    cout << "Registration number - Marks\n"

                         << endl;

                    while (infile >> data) {

                        cout << data;

                        infile >> data;

                        infile >> data;

                        cout << " - " << data << endl;

                        infile >> data;

                        infile >> data;

                        check = 1;

                    }

                }
 

                infile.close();

                infile.open("Example.txt", ios::in);
 

                if (strcmp(subcode, code2.c_str()) == 0) {

                    cout << "Registration number - Marks\n"

                         << endl;

                    while (infile >> data) {

                        cout << data;

                        infile >> data;

                        infile >> data;

                        infile >> data;

                        cout << " - " << data << endl;

                        infile >> data;

                        check = 1;

                    }

                }

            }
 

            infile.close();
 

            if (check == 0) {

                cout << "No such subject code found!"

                     << endl;

            }

        }
 
        else if (option == 4) {

            char procid[7];

            cout << "Enter your proctor ID: ";

            cin >> procid;

            int check = 0;

            char temp1[100], temp2[100], temp3[100];

            char temp4[100], id[100];

            ifstream infile;

            infile.open("Example.txt", ios::in);
 

            while (infile >> temp1) {

                infile >> temp2;

                infile >> temp3;

                infile >> temp4;

                infile >> id;
 

                if (strcmp(id, procid) == 0) {

                    cout << "\nRegistration Number: "

                         << temp1 << endl;

                    cout << "Name: " << temp2 << endl;

                    cout << "CSE1001 Mark: " << temp3

                         << endl;

                    cout << "CSE1002 Mark: " << temp4

                         << endl;

                    check = 1;

                }

            }
 

            if (check == 0) {

                cout << "No such proctor ID found!" << endl;

            }

        }
 

        else if (option == 5) {

            char password[25];

            cout << "Enter the admin password: ";

            cin >> password;

            string admin_pass = "admin";
 

            if (strcmp(password, admin_pass.c_str()) == 0) {

                cout << "Reg No.       "

                        "\tName\tCSE1001\tCSE1002\tProctor "

                        "ID"

                     << endl;

                ifstream infile;

                infile.open("Example.txt", ios::in);

                char data[20];
 

                while (infile >> data) {

                    cout << data << "\t";

                    infile >> data;

                    cout << data << "\t";

                    infile >> data;

                    cout << data << "\t";

                    infile >> data;

                    cout << data << "\t";

                    infile >> data;

                    cout << data << endl;

                }

            }

        }

    }
}