OOP Project

#include <iostream>
#include <fstream>
#include <windows.h>
#include <conio.h>
#include "header.h"
using namespace std;

int main()
{
    system("color 0a");
    int i,c=0,attempt = 3,max = 10,auth = 1;
    string uname,pass,a,b;
    string str;
    ifstream Uname,Pass;
    ofstream u,p;
    Manage *ptr,*temp;
    ptr = new Manage [max];
    temp = ptr;
    au();
    ifstream ufile("u.txt"),pfile("p.txt");
    if(!ufile.good() || !pfile.good())
    {
        ufile.close();
        pfile.close();
        string admin = "admin";
        u.open("u.txt");
        p.open("p.txt");
        admin = encrypt(admin);
        u << admin;
        p << admin;
        u.close();
        p.close();
    }
    Uname.open("u.txt");
    Pass.open("p.txt");
    Uname >> a;
    Pass >> b;
    a = decrypt(a);
    b = decrypt(b);
    Uname.close();
    Pass.close();
    do
    {
        ptr = temp;
        while(auth == 0)
        {
            char ch;
            pass = "";
            if(attempt == 3)
            {
                cout << "Default username password is admin : admin" << endl;
            }
            cout << "Enter Username : ";
            cin >> uname;
            cout << "Enter Password : ";
            ch = _getch();
            while(ch != 13)
            {
              pass.push_back(ch);
              cout << '*';
              ch = _getch();
            }
            cout << endl;
            if(uname == a && pass == b)
            {
                cout << "Login successful ! ";
                cout << "\nLoading =";
                for(int i=0;i<30;i++)
                {
                    cout << "-" ;
                    Sleep(100);
                }
                cout << "\nSuccessfully loaded ! " << endl;
                auth++;
                system("pause");
                system("cls");
            }
            else
            {
                if(attempt == 0)
                {
                    goto end;
                }
                cout << "Invalid username or password ! " << attempt << " attempts left ! " << endl;
                attempt--;
            }
        }
        system("cls");
        au();
        cout << "Enter\n1 to add student\n2 to add acadamic activities\n3 to add non acadamic activities\n4 to show profile\n5 to show result\n6 to show non acadamic activities";
        cout << "\n7 to delete a student\n8 to register for a new semester\n9 to edit a student\n10 to append current data with previous data\n11 to save data\n12 to load data\n13 to update username and password" << "\n0 to exit !" << endl;
        while(!(cin >> c))
        {
            cin.clear();
            cin.ignore();
            cout << "Invalid input ! Try again : ";
        }
        if(c==1)
        {
            ptr->Manage::setData();
        }
        else if(c==2)
        {
            ptr->Acadamic::setData();
        }
        else if(c==3)
        {
            ptr->nonAcadamic::setData();
        }
        else if (c == 4)
        {
            ptr->Student::getData();
        }
        else if(c==5)
        {
            ptr->Acadamic::getData();
        }
        else if(c==6)
        {
            ptr->nonAcadamic::getData();
        }
        else if(c==7)
        {
            ptr->del();
        }
        else if( c == 8 )
        {
            ptr->Register();
        }
        else if ( c== 9)
        {
            ptr->edit();
        }
        else if(c == 10)
        {
            ptr->append();
        }
        else if (c == 11)
        {
            ptr->append();
        }
        else if (c == 12)
        {
            ptr->save();
        }
        else if (c == 13)
        {
            auth = 0;
            while(auth == 0)
            {
                char ch;
                pass = "";
                cout << "Enter current username : ";
                cin >> uname;
                cout << "Enter current password : ";
                ch = _getch();
                while(ch != 13)
                {
                  pass.push_back(ch);
                  cout << '*';
                  ch = _getch();
                }
                if(uname == a && pass == b)
                {
                    pass = "";
                    cout << endl << "Enter new username : ";
                    cin >> uname;
                    cout << "Enter new password : ";
                    ch = _getch();
                    while(ch != 13)
                    {
                      pass.push_back(ch);
                      cout << '*';
                      ch = _getch();
                    }
                    u.open("u.txt");
                    p.open("p.txt");
                    uname = encrypt(uname);
                    pass = encrypt(pass);
                    u << uname;
                    p << pass;
                    u.close();
                    p.close();
                    auth++;
                    cout << endl << "Username and password updated ! ";
                }
                else
                {
                    if(attempt == 0)
                    {
                        goto end;
                    }
                    cout << "Invalid username or password ! " << attempt << " attempts left ! " << endl;
                    attempt--;
                }
            }
        }
        system("pause");
        system("cls");
    }
    while(c != 0);
    if(c == 0)
    {
        abc:
        cout << "Do you want to save data ? \nEnter\n1 to save data\n2 to append current data with previous one\n0 to exit without saving !";
        cin >> c;
        if(c == 1)
        {
            ptr->save();
        }
        else if(c == 2)
        {
            ptr->append();
        }
        else if(c == 0)
        {
            system("cls");
            cout << "Thanks for using our software ! Bye !" << endl;
        }
        else
        {
            cout << "Enter Again ! ";
            system("pause");
            goto abc;
        }
    }
    end:
        if(attempt == 0)
        {
            cout << "Login Failed ! Exiting ";
        }
}
=================================================================================
///////////////////////////////////// HEADER.H ///////////////////////////////////
---------------------------------------------------------------------------------
_________________________________________________________________________________

#include <iostream>
#include <string>
#include <iomanip>
using namespace std;
int total = 0;
class Manage;
class Student
{
    protected:
        int cs,num;
        string name,no,dept;
    public:
        int id;
        Student()
        {
            cs = 1;
        }

        void getData()
        {
            system("cls");
            Student *ptr;
            ptr = this;
            for(int i=0;i<=total;i++)
            {
                if(ptr->id!=0)
                {
                    ptr->getID();
                    ptr->getName();
                    ptr->getNo();
                    ptr->getDept();
                }
                ptr++;
            }
        }
        void getID()
        {
            cout << "ID : " << this->id << endl;
        }
        void getName()
        {
            cout << "Name : " << this->name << endl;
        }
        void getNo()
        {
            cout << "Contact no. : " << this->no << endl;
        }
        void getDept()
        {
            cout << "Department : " << this->dept << endl;
        }
        /////////////////////check if id is ZERO/////////////////////////////////
        int checkid()
        {
            if(id == 0)
            {
                return 0;
            }
            else
            {
                return 1;
            }
        }
        /////////////////////////////Input validation check////////////////////////////////
    int check(int x = 0)
    {
        while(!(cin >> x) || x < 0)
        {
            cin.clear();
            cin.ignore();
            cout << "Invalid input ! Try again : ";
        }
        return x;
    }
};
/////////      ACADAMIC         /////////
struct Subjects
{
    int name,quiz,as,proj,exams;
};
class Acadamic : public virtual Student
{
    protected:
        Subjects sub[6];
        float cgpa,gpa[8];
    public:
        void setData()
        {
            system("cls");
            Acadamic *ptr;
            ptr = this;
            ptr->setSub();
            ptr->calGpa();
        }
        void setSub()
        {
            cout << "Total marks are 100 " << endl;
            for(int i=0;i<6;i++)
            {
                cout << "Enter name of subject : ";
                cin >> sub[i].name;
                cout << "Enter marks of quizes : ";
                sub[i].quiz = Acadamic::check() ;
                cout << "Enter marks of assignments : ";
                sub[i].as = Acadamic::check() ;
                cout << "Enter marks of project : ";
                sub[i].proj = Acadamic::check() ;
                cout << "Enter marks of exams : ";
                sub[i].exams = Acadamic::check() ;
            }
        }
        void calGpa()
        {
            gpa[cs] = 0;
            for(int i=0;i<6;i++)
            {
                gpa[cs] = gpa [cs] + sub[i].quiz + sub[i].as + sub[i].proj + sub[i].exams;
            }
            gpa[cs] = gpa[cs] / 100;
            this->calCgpa();
        }
        void calCgpa()
        {
            cgpa = 0.0;
            for(int i=0;i<cs;i++)
            {
                cgpa = cgpa + gpa[i];
            }
            cgpa = cgpa / cs;
        }
        //////////////////getData///////////////////////////////
        void getData()
        {
            Acadamic *ptr;
            ptr = this;
            header();
            for(int i=0;i<total;i++)
            {
                if(ptr->id!=0)
                {
                    getNum();
                    ptr->getID();
                    ptr->getName();
                    ptr->getNo();
                    ptr->getCS();
                    ptr->getCGPA();
                    ptr->getGPA();
                    cout << endl <<  "------------------------------------------------------------------------------------------------------------------------------------------------" << endl;
                }
                ptr++;
            }
        }
        void getNum()
        {
            num++;
            cout << " " << left << setw(5) << num << left << setw(2) << "|";
        }
        void getID()
        {
            cout << left << setw(7) << id << left << setw(2) << "|";
        }
        void getName()
        {
            cout << left << setw(19) << name << left << setw(2) << "|";
        }
            void getNo()
        {
            cout << left << setw(15) << no << left << setw(5) << "|";
        }
        void getCS()
        {
            cout << left << setw(6) << cs << left << setw(2) << "|";
        }
        void getCGPA()
        {
            cout << fixed << setprecision(2)  << left << setw(5) << cgpa << left << setw(2) << "|";
        }
        void getGPA()
        {
            for(int j=0;j<cs;j++)
            {
                cout << left << setw(7) << gpa[j]<< left << setw(2) << "|";
            }
        }
        ////////////Header//////////////
        void header()
        {
            system("cls");
            num = 0;
            cout << "------------------------------------------------------------------------------------------------------------------------------------------------" << endl;
            cout << " " << left << setw(5) << "No." << left << setw(4) << "|";
            cout << left << setw(5) << "ID" << left << setw(9) << "|";
            cout << left << setw(12) << "Name" << left << setw(5) << "|";
            cout << left << setw(12) << "Contact"<< left << setw(2) << "|";
            cout << left << setw(9) << "Semester"<< left << setw(2) << "|";
            cout << left << setw(5) << "CGPA" << left << setw(2) << "|";
            for(int i=0;i<8;i++)
            {
                cout << left << setw(0) << "GPA("<<setw(0)<<i+1<<setw(2)<< ")" << left << setw(2) << "|";
            }
            cout << endl <<  "------------------------------------------------------------------------------------------------------------------------------------------------" << endl;
        }
        //////////get single student data//////////
        void get()
        {
            Acadamic *ptr;
            ptr = this;
            getNum();
            ptr->getID();
            ptr->getName();
            ptr->getNo();
            ptr->getCS();
            ptr->getCGPA();
            ptr->getGPA();
            cout << endl <<  "---------------------------------------------------------------------------------------------------------------------------------------------------" << endl;
        }
    int check(int x = 0)
    {
        while(!(cin >> x) || x < 0 || x > 100)
        {
            cin.clear();
            cin.ignore();
            cout << "Invalid input ! Try again : ";
        }
        return x;
    }
};
/////////      NON-ACADAMIC         /////////
class nonAcadamic : public virtual Student
{
    protected:
        string name,pos,role;
    public:
        void setData()
        {
            nonAcadamic *ptr;
            ptr = this;
            ptr->setName();
            ptr->setPos();
            ptr->setRole();
        }
        void setName()
        {
            cout << "Enter name of event : ";
            cin >> name;
        }
        void setPos()
        {
            cout << "Enter position : ";
            cin >> pos;
        }
        void setRole()
        {
            cout << "Enter role : ";
            cin >> role;
        }

        void getData()
        {
            nonAcadamic *ptr;
            ptr = this;
            for(int i=0;i<total;i++)
            {
                if(ptr->id!=0)
                {
                    ptr->getName();
                    ptr->getPos();
                    ptr->getRole();
                }
                ptr++;
            }
        }
        void getName()
        {
            cout << "Name of event : " << this->name << endl;
        }
        void getPos()
        {
            cout << "Position : " << this->pos << endl;
        }
        void getRole()
        {
            cout << "Role : " << this->role << endl << endl;
        }
};
/////////      Manage         /////////
class Manage : public nonAcadamic, public Acadamic
{
    protected:

    public:
        ////////////////setData//////////
        /////////////setData////////////////////
        void setData()
        {
            system("cls");
            Manage *ptr;
            ptr = this;
            int x=0;
            while (x == 0)
            {
                system("cls");
                if(ptr->id == 0)
                {
                    ptr->setID();
                    ptr->setName();
                    ptr->setNo();
                    ptr->setDept();
                    total++;
                    x++;
                }
                ptr++;
            }
        }
        void setID()
        {
            cout << "Enter ID : ";
            id = check();
        }
        void setName()
        {
            cout << "Enter name : ";
            cin.ignore();
            getline(cin,name);
        }
        void setNo()
        {
            cout << "Enter contact no. : ";
            cin >> no;
        }
        void setDept()
        {
            cout << "Enter department : ";
            cin >> dept;
        }
        //////////////Search///////////
        void search()
        {
            float Gpa;
            string Name;
            int ser,Id,count=0;
            Manage *ptr;
            ptr = this;
            search:
            system("cls");
            cout << "Enter\n1 to Search by GPA\n2 to Search by Name\n3 to Search all who are above 3.5 GPA\n";
            cout << "4 to Search all who are under serious warning (i.e. CGPA below 1.8)\n5 to Search all who are under warning ";
            cout << "(i.e. CGPA below 2.0 and above 1.8)\n6 to Search by ID " << endl;
            cin >> ser;
            if(ser==1)
            {
                cout << "Enter GPA to search : ";
                cin >> Gpa;
            }
            else if (ser==2)
            {
                cout << "Enter name to search : ";
                cin >> Name;
            }
            else if(ser==6)
            {
                cout << "Enter ID to search : ";
                cin >> Id;
            }
            else if (ser < 1 || ser > 6)
            {
                cout << "Wrong choice ! " << endl;
                system("pause");
                goto search;
            }
            header();
            for(int j=0;j<total;j++)
            {
                if(ser == 1)
                {
                    for(int i=0;i<ptr->cs;i++)
                    {
                        if(Gpa == ptr->gpa[i])
                        {
                            ptr->get();
                            count++;
                        }
                    }
                }
                else if(ser == 2)
                {
                    if(Name == ptr->name)
                    {
                        ptr->get();
                        count++;
                    }
                }
                else if(ser == 3)
                {
                    for(int i=0;i<ptr->cs;i++)
                    {
                        if(ptr->gpa[i] > 3.5)
                        {
                            ptr->get();
                            count++;
                        }
                    }
                }
                else if(ser == 4)
                {
                    for(int i=0;i<ptr->cs;i++)
                    {
                        if(ptr->gpa[i] < 1.8)
                        {
                            ptr->get();
                            count++;
                        }
                    }
                }
                else if(ser == 5)
                {
                    for(int i=0;i<ptr->cs;i++)
                    {
                        if(ptr->gpa[i] < 2.0 && ptr->gpa[i] > 1.8)
                        {
                            ptr->get();
                            count++;
                        }
                    }
                }
                else if(ser == 6)
                {
                    if(Id == ptr->id)
                    {
                        ptr->get();
                        count++;
                    }
                }
                ptr++;
            }
            if(count == 0)
            {
                cout << "Error 404 ! Not found !";
            }
        }
        void dell()
        {
            Manage *ptr;
            ptr = this;
            ptr->id=0;
            ptr->cgpa=0;
            for(int i=0;i<ptr->cs;i++)
            {
                ptr->gpa[i] = 0.0;
            }
            ptr->cs=0;
            ptr->name = "Delete";
            ptr->no = "090078601";
        }
        void del()
        {
            Manage *ptr;
            ptr = this;
            int Id,count,ser;
            string Name;
            edit:
            system("cls");
            cout << "Enter 1 to delete by name,2 to edit by ID : " << endl;
            cin >> ser;
            if(ser==1)
            {
                cout << "Enter student name to delete : ";
                cin >> Name;
            }
            else if (ser==2)
            {
                cout << "Enter student ID to delete : ";
                cin >> Id;
            }
            else
            {
                cout << "Wrong choice ! " << endl;
                system("pause");
                goto edit;
            }
            for(int i=0;i<total;i++)
            {
                if(Id == ptr->id)
                {
                    ptr->dell();
                    cout << "Deleted !" << endl;
                    count++;
                }
                else if(Name == ptr->name)
                {
                    ptr->dell();
                    cout << "Deleted !" << endl;
                    count++;
                }
                ptr++;
            }
            if(count == 0)
            {
                cout << "Student not found ! " << endl;
            }
        }
        void Register()
        {
            system("cls");
            char c;
            cout << "Do you want to register for next course ? (Enter y or n):";
            cin >> c;
            if(c == 'y')
            {
                if(this->gpa[cs] > 2.0)
                {
                    this->cs++;
                }
                else
                {
                    cout << "You can not register for this course ! ";
                }
            }
            else if(c == 'n')
            {

            }
            else
            {
                cout << "Invalid choice ! ";
                system("pause");
                this->Register();
            }
        }
        void edit()
        {
            Manage *ptr;
            ptr = this;
            int Id,count,ser;
            string Name;
            edit:
            system("cls");
            cout << "Enter 1 to edit by name,2 to edit by ID : " << endl;
            cin >> ser;
            if(ser==1)
            {
                cout << "Enter student name to edit : ";
                cin >> Name;
            }
            else if (ser==2)
            {
                cout << "Enter student ID to edit : ";
                cin >> Id;
            }
            else
            {
                cout << "Wrong choice ! " << endl;
                system("pause");
                goto edit;
            }
            for(int i=0;i<total;i++)
            {
                if(Id == ptr->id)
                {
                    ptr->Manage::setData();
                    count++;
                }
                else if(Name == ptr->name)
                {
                    ptr->Manage::setData();
                    count++;
                }
                ptr++;
            }
            if(count == 0)
            {
                cout << "Student not found ! " << endl;
            }
        }

/////////////////////////////////////////////// File Handling /////////////////////////////////////////////////////////////////////////////////
        //////////////////Append/////////////////////////
        void append()
        {
            Manage *ptr;
            ptr = this;
            ofstream Id,Name,dept,Gpa,Cgpa,No,Cs,Subj;
            Id.open("id.txt",fstream::app);
            Name.open("name.txt",fstream::app);
            dept.open("dept.txt",fstream::app);
            Gpa.open("gpa.txt",fstream::app);
            Cgpa.open("cgpa.txt",fstream::app);
            No.open("no.txt",fstream::app);
            Cs.open("cs.txt",fstream::app);
            Subj.open("subj.txt",fstream::app);
            for(int i=0;i<total;i++)
            {
                if(ptr->id != 0)
                {
                    Cs << ptr->cs << endl;
                    Id << ptr->id << endl;
                    Name << ptr->name << endl;
                    for(int j=0;j<ptr->cs;j++)
                    {
                        Gpa << ptr->gpa[j] <<"\t";
                    }
                    Gpa << endl;
                    Name << ptr->dept << endl;
                    for(int j=0;j<ptr->cs;j++)
                    {
                        Subj << ptr->sub[j].as << endl;
                        Subj << ptr->sub[j].exams << endl;
                        Subj << ptr->sub[j].name << endl;
                        Subj << ptr->sub[j].proj << endl;
                        Subj << ptr->sub[j].quiz << endl;
                    }
                    Cgpa << ptr->cgpa << endl;
                    No << ptr->no << endl;
                }
                ptr++;
            }
            Id.close();
            Name.close();
            dept.close();
            Gpa.close();
            Cgpa.close();
            No.close();
            Cs.close();
            cout << "Successfully appended data in txt file ! ";
        }
        /////////////////Save/////////////////////
        void save()
        {
            Manage *ptr;
            ptr = this;
            ofstream Id,Name,Dept,Gpa,Cgpa,No,Cs,Subj;
            Id.open("id.txt");
            Name.open("name.txt");
            Dept.open("dept.txt");
            Gpa.open("gpa.txt");
            Cgpa.open("cgpa.txt");
            No.open("no.txt");
            Subj.open("subj.txt");
            Cs.open("cs.txt");      //  n
            for(int i=0;i<total;i++)
            {
                if(ptr->id != 0)
                {
                    Cs << ptr->cs << endl;
                    Id << ptr->id << endl;
                    Name << ptr->name << endl;
                    for(int j=0;j<ptr->cs;j++)
                    {
                        Gpa << ptr->gpa[j] <<"\t";
                    }
                    Gpa << endl;
                    Dept << ptr->dept << endl;
                    for(int j=0;j<ptr->cs;j++)
                    {
                        Subj << ptr->sub[j].as << endl;
                        Subj << ptr->sub[j].exams << endl;
                        Subj << ptr->sub[j].name << endl;
                        Subj << ptr->sub[j].proj << endl;
                        Subj << ptr->sub[j].quiz << endl;
                    }
                    Cgpa << ptr->cgpa << endl;
                    No << ptr->no << endl;
                }
                ptr++;
            }
            Id.close();
            Name.close();
            Subj.close();
            Gpa.close();
            Cgpa.close();
            No.close();
            Cs.close();
            cout << "Successfully saved data in txt file ! ";
        }
        /////////////////load from file/////////////////////////
        void load()
        {
            Manage *ptr;
            ptr = this;
            ifstream Id,Name,Sem,Gpa,Cgpa,No,N,Subj;
            Id.open("id.txt");
            Name.open("name.txt");
            Sem.open("sem.txt");
            Gpa.open("gpa.txt");
            Cgpa.open("cgpa.txt");
            No.open("no.txt");
            Subj.open("subj.txt");
            N.open("cs.txt");
            if(Id.is_open())
            {
                while(!Id.eof())
                {
                    if(ptr->id == 0)
                    {

                        Id >> ptr->id;
                        if(ptr->id == 0)
                        {
                            break;
                        }
                        N >> ptr->cs;
                        getline(Name,ptr->name);
                        for(int j=0;j<ptr->cs;j++)
                        {
                            Gpa >> ptr->gpa[j];
                        }
                        Name >> ptr->dept;
                        for(int j=0;j<ptr->cs;j++)
                        {
                            Subj >> ptr->sub[j].as;
                            Subj >> ptr->sub[j].exams;
                            Subj >> ptr->sub[j].name;
                            Subj >> ptr->sub[j].proj;
                            Subj >> ptr->sub[j].quiz;
                        }
                        Cgpa >> ptr->cgpa;
                        No >> ptr->no;
                        total++;
                    }
                    ptr++;
                }
            }
            cout << "Successfully loaded data from txt file ! ";
            Id.close();
            Name.close();
            Sem.close();
            Gpa.close();
            Cgpa.close();
            No.close();
            N.close();
        }
};
//////////  FUNCTIONS ////////////
void au()
{
    cout << "\t\t           _        _    _       _                    _ _         " << endl;
    cout << "\t\t     /\\   (_)      | |  | |     (_)                  (_) |        " << endl;
    cout << "\t\t    /  \\   _ _ __  | |  | |_ __  ___   _____ _ __ ___ _| |_ _   _ " << endl;
    cout << "\t\t   / /\\ \\ | | '__| | |  | | '_ \\| \\ \\ / / _ \\ '__/ __| | __| | | |" << endl;
    cout << "\t\t  / ____ \\| | |    | |__| | | | | |\\ V /  __/ |  \\__ \\ | |_| |_| |" << endl;
    cout << "\t\t /_/    \\_\\_|_|     \\____/|_| |_|_| \\_/ \\___|_|  |___/_|\\__|\\__, |" << endl;
    cout << "\t\t                                                             __/ |" << endl;
    cout << "\t\t                                                            |___/ " << endl;
    cout << endl << "\t\t    Welcome to Air University Students Managment System v1.0" << endl;
    cout <<         "\t\t    ________________________________________________________" << endl;
}
string encrypt (string a)
{
    for(int i=0;i<a.length();i++)
    {
        a.at(i) = a.at(i) + i - 64;
    }
    return a;
}
string decrypt (string a)
{
    for(int i=0;i<a.length();i++)
    {
        a.at(i) = a.at(i) - i + 64;
    }
    return a;
}