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

#include<fstream.h>
#include<iomanip.h>
#include<stdio.h>
#include<conio.h>


//***************************************************************
//                   CLASS USED IN PROJECT
//****************************************************************

class student
{
 int rollno;
 char name[50];
 int p_marks, c_marks, m_marks, e_marks, cs_marks;
 float per;
 char grade;
 void calculate(); //function to calculate grade
public:
 void getdata();  //function to accept data from user
 void showdata(); //function to show data on screen
 void show_tabular();
 int retrollno();
}; //class ends here


void student::calculate()
{
 per=(p_marks+c_marks+m_marks+e_marks+cs_marks)/5.0;
 if(per>=60)
  grade='A';
 else if(per>=50)
  grade='B';
 else if(per>=33)
  grade='C';
 else
  grade='F';
}

void student::getdata()
{
 cout<<"\nEnter The roll number of student ";
 cin>>rollno;
 cout<<"\n\nEnter The Name of student ";
 gets(name);
 cout<<"\nEnter The marks in physics out of 100 : ";
 cin>>p_marks;
 cout<<"\nEnter The marks in chemistry out of 100 : ";
 cin>>c_marks;
 cout<<"\nEnter The marks in maths out of 100 : ";
 cin>>m_marks;
 cout<<"\nEnter The marks in english out of 100 : ";
 cin>>e_marks;
 cout<<"\nEnter The marks in computer science out of 100 : ";
 cin>>cs_marks;
 calculate();
}

void student::showdata()
{
 cout<<"\nRoll number of student : "<<rollno;
 cout<<"\nName of student : "<<name;
 cout<<"\nMarks in Physics : "<<p_marks;
 cout<<"\nMarks in Chemistry : "<<c_marks;
 cout<<"\nMarks in Maths : "<<m_marks;
 cout<<"\nMarks in English : "<<e_marks;
 cout<<"\nMarks in Computer Science :"<<cs_marks;
 cout<<"\nPercentage of student is  :"<<per;
 cout<<"\nGrade of student is :"<<grade;
}

void student::show_tabular()
{
 cout<<rollno<<setw(6)<<" "<<name<<setw(10)<<p_marks<<setw(4)<<c_marks<<setw(4)<<m_marks<<setw(4)
  <<e_marks<<setw(4)<<cs_marks<<setw(6)<<per<<setw(6)<<" "<<grade<<endl;
}

int  student::retrollno()
{
 return rollno;
}


//***************************************************************
//     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
//****************************************************************



int main()
{
 char ch;
 cout.setf(ios::fixed|ios::showpoint);
 cout<<setprecision(2); // program outputs decimal number to two decimal places
 clrscr();
 intro();
 do
 {
  clrscr();
  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;
  clrscr();
  switch(ch)
  {
   case '1': result();
    break;
   case '2': entry_menu();
    break;
   case '3':
    break;
   default :cout<<"\a";
  }
     }while(ch!='3');
 return 0;
}

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

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

//***************************************************************
//     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...";
  getch();
  return;
 }
 cout<<"\n\n\n\t\tDISPLAY ALL RECORD !!!\n\n";
 while(inFile.read((char *) &st, sizeof(student)))
 {
  st.showdata();
  cout<<"\n\n====================================\n";
 }
 inFile.close();
 getch();
}

//***************************************************************
//     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...";
  getch();
  return;
 }

 int flag=0;
 while(inFile.read((char *) &st, sizeof(student)))
 {
  if(st.retrollno()==n)
  {
    st.showdata();
    flag=1;
  }
 }
 inFile.close();
 if(flag==0)
  cout<<"\n\nrecord not exist";
 getch();
}

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

void modify_student(int n)
{
 int found=0;
 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...";
  getch();
  return;
 }
 while(File.read((char *) &st, sizeof(student)) && found==0)
 {
  if(st.retrollno()==n)
  {
   st.showdata();
   cout<<"\n\nPlease Enter The New Details of student"<<endl;
   st.getdata();
       int pos=(-1)*sizeof(st);
       File.seekp(pos,ios::cur);
       File.write((char *) &st, sizeof(student));
       cout<<"\n\n\t Record Updated";
       found=1;
  }
 }
 File.close();
 if(found==0)
  cout<<"\n\n Record Not Found ";
 getch();
}

//***************************************************************
//     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...";
  getch();
  return;
 }
 ofstream outFile;
 outFile.open("Temp.dat",ios::out);
 inFile.seekg(0,ios::beg);
 while(inFile.read((char *) &st, sizeof(student)))
 {
  if(st.retrollno()!=n)
  {
   outFile.write((char *) &st, sizeof(student));
  }
 }
 outFile.close();
 inFile.close();
 remove("student.dat");
 rename("Temp.dat","student.dat");
 cout<<"\n\n\tRecord Deleted ..";
 getch();
}

//***************************************************************
//     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...";
  getch();
  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((char *) &st, sizeof(student)))
 {
  st.show_tabular();
 }
 getch();
 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;
 clrscr();
 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\tREPORT CARD";
 cout<<"\n\n\t\t  PROJECT";
 cout<<"\n\n\n\tMADE BY : SULABH AGRAWAL";
 cout<<"\n\tSCHOOL : CAMBRIDGE SCHOOL";
 getch();
}

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

void entry_menu()
{
 char ch;
 int num;
 clrscr();
 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;
 clrscr();
 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
//***************************************************************

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