source

//***************************************************************
//                   HEADER FILE USED IN PROJECT
//****************************************************************

#include<iostream>
#include<fstream>
#include<iomanip>
using namespace std;


//***************************************************************
//                   CLASS USED IN PROJECT
//****************************************************************
class login
{
public:
    string username,password;
    login ()
    {
        username= " \0";
        password= " \0";
    };
    bool IslogIn();
};
bool login ::IslogIn()
{
    string ch_username= "BAKHIT", ch_password = "test123";

    cout << "Enter your user name  ::\n";
    cin >> username;

    cout << "Enter the Password :: \n";
    cin >> password;

    if (username == ch_username && password == ch_password)
    {
        return true;
    }
    else
    {
        return false;
    }
}

int main()
{
    login l1;
    bool status = l1.IslogIn();
    if (!status)
    {
        cout << " Failed login,register first at www.iukl.edu.my/student portal\n";
        return 1;
    }
    else
    {
        cout << "Welcome " << l1.username << " !\n" ;

    }
   int intro();
   int result();
   int entry_menu();
   char ch;
    cout.setf(ios::fixed|ios::showpoint);
    cout<<setprecision(2); // program outputs decimal number to two decimal places
    intro();
    do
    {

        cout<<"\n\n\n\tMAIN MENU";
        cout<<"\n\n\t01. RESULT MENU";
        cout<<"\n\n\t02. ENTRY/EDIT MENU";
        cout<<"\n\n\t03. EXIT";
        cout<<"\n\n\tPlease Select Your Option (1-3) ";
        cin>>ch;
        switch(ch)
        {
            case '1': result();
                break;
            case '2': entry_menu();
                break;
            case '3':
                break;
            default :cout<<"\a";
        }
    }while(ch!='3');
    return 0;
}



class student
{
    int SANAULLAH;
    char name[50];
    int RC_marks,SA_marks, GEO_marks, Math2_marks, CS_marks;
    double Av;
    char grade;
    void calculate();   //function to calculate grade
public:
    void getdata();     //function to accept data from user
    void showdata() const;  //function to show data on screen
    void show_tabular() const;
    int retrollno() const;
}; //class ends here


void student::calculate()
{
    Av=(RC_marks, SA_marks, GEO_marks, Math2_marks, CS_marks)/5.0;
    if(Av>=60)
        grade='A';
    else if(Av>=50)
        grade='B';
    else if(Av>=33)
        grade='C';
    else
        grade='F';
}

void student::getdata()
{
    cout<<"\nEnter The roll number of student ";
    cin>>SANAULLAH;
    cout<<"\n\nEnter The Name of student ";
    cin.ignore();
    cin.getline(name,50);
    cout<<"\nEnter The marks in Reinforced Concrete  out of 100 : ";
    cin>>RC_marks;
    cout<<"\nEnter The marks in Structural Analysis out of 100 : ";
    cin>>SA_marks;
    cout<<"\nEnter The marks in maths 2 out of 100 : ";
    cin>>Math2_marks;
    cout<<"\nEnter The marks in Geology out of 100 : ";
    cin>>GEO_marks;
    cout<<"\nEnter The marks in computer science out of 100 : ";
    cin>>CS_marks;
    calculate();
}

void student::showdata() const
{
    cout<<"\nRoll number of student : "<<SANAULLAH;
    cout<<"\nName of student : "<<name;
    cout<<"\nMarks in Reinforced Concrete : "<<RC_marks;
    cout<<"\nMarks in Geology : "<<GEO_marks;
    cout<<"\nMarks in Maths 2: "<<Math2_marks;
    cout<<"\nMarks in Structural Analysis  : "<<SA_marks;
    cout<<"\nMarks in Computer Science :"<<CS_marks;
    cout<<"\nPercentage of student is  :"<<Av;
    cout<<"\nGrade of student is :"<<grade;

}

void student::show_tabular() const
{
    cout<<SANAULLAH<<setw(6)<<" "<<name<<setw(10)<<RC_marks<<setw(4)<<GEO_marks<<setw(4)<<Math2_marks<<setw(4)
        <<SA_marks<<setw(4)<<CS_marks<<setw(8)<<Av<<setw(6)<<grade<<endl;
}

int  student::retrollno() const
{
    return SANAULLAH;
}


//***************************************************************
//      function declaration
//****************************************************************

void write_student();   //write the record in binary file
void display_all(); //read all records from binary file
void display_sp(int);   //accept rollno and read record from binary file
void modify_student(int);   //accept rollno and update record of binary file
void delete_student(int);   //accept rollno and delete selected records from binary file
void class_result();    //display all records in tabular format from binary file
void result();      //display result menu
void intro();       //display welcome screen
void entry_menu();  //display entry menu on screen


//***************************************************************
//      THE MAIN FUNCTION OF PROGRAM
//****************************************************************


//***************************************************************
//      function to write in file
//****************************************************************

void write_student()
{
    student st;
    ofstream outFile;
    outFile.open("student.dat",ios::binary|ios::app);
    st.getdata();
    outFile.write(reinterpret_cast<char *> (&st), sizeof(student));
    outFile.close();
        cout<<"\n\nStudent record Has Been Created ";
    cin.ignore();
    cin.get();
}

//***************************************************************
//      function to read all records from file
//****************************************************************

void display_all()
{
    student st;
    ifstream inFile;
    inFile.open("student.dat",ios::binary);
    if(!inFile)
    {
        cout<<"File could not be open !! Press any Key...";
        cin.ignore();
        cin.get();
        return;
    }
    cout<<"\n\n\n\t\tDISPLAY ALL RECORD !!!\n\n";
    while(inFile.read(reinterpret_cast<char *> (&st), sizeof(student)))
    {
        st.showdata();
        cout<<"\n\n====================================\n";
    }
    inFile.close();
    cin.ignore();
    cin.get();
}

//***************************************************************
//      function to read specific record from file
//****************************************************************

void display_sp(int n)
{
    student st;
    ifstream inFile;
    inFile.open("student.dat",ios::binary);
    if(!inFile)
    {
        cout<<"File could not be open !! Press any Key...";
        cin.ignore();
        cin.get();
        return;
    }
    bool flag=false;
    while(inFile.read(reinterpret_cast<char *> (&st), sizeof(student)))
    {
        if(st.retrollno()==n)
        {
             st.showdata();
             flag=true;
        }
    }
    inFile.close();
    if(flag==false)
        cout<<"\n\nrecord not exist";
    cin.ignore();
    cin.get();
}

//***************************************************************
//      function to modify record of file
//****************************************************************

void modify_student(int n)
{
    bool found=false;
    student st;
    fstream File;
    File.open("student.dat",ios::binary|ios::in|ios::out);
    if(!File)
    {
        cout<<"File could not be open !! Press any Key...";
        cin.ignore();
        cin.get();
        return;
    }
        while(!File.eof() && found==false)
    {

        File.read(reinterpret_cast<char *> (&st), sizeof(student));
        if(st.retrollno()==n)
        {
            st.showdata();
            cout<<"\n\nPlease Enter The New Details of student"<<endl;
            st.getdata();
                int pos=(-1)*static_cast<int>(sizeof(st));
                File.seekp(pos,ios::cur);
                File.write(reinterpret_cast<char *> (&st), sizeof(student));
                cout<<"\n\n\t Record Updated";
                found=true;
        }
    }
    File.close();
    if(found==false)
        cout<<"\n\n Record Not Found ";
    cin.ignore();
    cin.get();
}

//***************************************************************
//      function to delete record of file
//****************************************************************

void delete_student(int n)
{
    student st;
    ifstream inFile;
    inFile.open("student.dat",ios::binary);
    if(!inFile)
    {
        cout<<"File could not be open !! Press any Key...";
        cin.ignore();
        cin.get();
        return;
    }
    ofstream outFile;
    outFile.open("Temp.dat",ios::out);
    inFile.seekg(0,ios::beg);
    while(inFile.read(reinterpret_cast<char *> (&st), sizeof(student)))
    {
        if(st.retrollno()!=n)
        {
            outFile.write(reinterpret_cast<char *> (&st), sizeof(student));
        }
    }
    outFile.close();
    inFile.close();
    remove("student.dat");
    rename("Temp.dat","student.dat");
    cout<<"\n\n\tRecord Deleted ..";
    cin.ignore();
    cin.get();
}

//***************************************************************
//      function to display all students grade report
//****************************************************************

void class_result()
{
    student st;
    ifstream inFile;
    inFile.open("student.dat",ios::binary);
    if(!inFile)
    {
        cout<<"File could not be open !! Press any Key...";
        cin.ignore();
        cin.get();
        return;
    }
    cout<<"\n\n\t\tALL STUDENTS RESULT \n\n";
    cout<<"==========================================================\n";
    cout<<"R.No       Name        P   C   M   E   CS   %age   Grade"<<endl;
    cout<<"==========================================================\n";
    while(inFile.read(reinterpret_cast<char *> (&st), sizeof(student)))
    {
        st.show_tabular();
    }
    cin.ignore();
    cin.get();
    inFile.close();
}

//***************************************************************
//      function to display result menu
//****************************************************************

void result()
{
    char ch;
    int rno;

    cout<<"\n\n\n\tRESULT MENU";
    cout<<"\n\n\n\t1. Class Result";
    cout<<"\n\n\t2. Student Report Card";
    cout<<"\n\n\t3. Back to Main Menu";
    cout<<"\n\n\n\tEnter Choice (1/2/3)? ";
    cin>>ch;

    switch(ch)
    {
    case '1' :  class_result(); break;
    case '2' :  cout<<"\n\n\tEnter Roll Number Of Student : "; cin>>rno;
                display_sp(rno); break;
    case '3' :  break;
    default:    cout<<"\a";
    }
}

//***************************************************************
//      INTRODUCTION FUNCTION
//****************************************************************

void intro()
{
    cout<<"\n\n\n\t\t  STUDENT";
    cout<<"\n\n\t\tResult management";
    cout<<"\n\n\t\t  computer programing PROJECT (June 2017 semester)";
    cout<<"\n\n\n\tMADE BY : BAKHIT BAHAR";
    cout<<"\n\tSCHOOL : INFRASTRUCTURE UNIVERSITY KUALA LUMPUR";
    cin.get();
}

//***************************************************************
//      ENTRY / EDIT MENU FUNCTION
//****************************************************************

void entry_menu()
{
    char ch;
    int num;

    cout<<"\n\n\n\tENTRY MENU";
    cout<<"\n\n\t1.CREATE STUDENT RECORD";
    cout<<"\n\n\t2.DISPLAY ALL STUDENTS RECORDS";
    cout<<"\n\n\t3.SEARCH STUDENT RECORD ";
    cout<<"\n\n\t4.MODIFY STUDENT RECORD";
    cout<<"\n\n\t5.DELETE STUDENT RECORD";
    cout<<"\n\n\t6.BACK TO MAIN MENU";
    cout<<"\n\n\tPlease Enter Your Choice (1-6) ";
    cin>>ch;

    switch(ch)
    {
    case '1':   write_student(); break;
    case '2':   display_all(); break;
    case '3':   cout<<"\n\n\tPlease Enter The roll number "; cin>>num;
            display_sp(num); break;
    case '4':   cout<<"\n\n\tPlease Enter The roll number "; cin>>num;
            modify_student(num);break;
    case '5':   cout<<"\n\n\tPlease Enter The roll number "; cin>>num;
            delete_student(num);break;
    case '6':   break;
    default:    cout<<"\a"; entry_menu();
    }
}

//***************************************************************
//              END OF PROJECT
//***************************************************************