Ask Question

Name:
Title:
Your Question:

Answer Question

Name:
Your Answer:
User Submitted Source Code!


Description:
  j
Language: C/C++
Code:
//***************************************************************
//                   HEADER FILE USED IN PROJECT
//****************************************************************

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


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

class student
{
     int rollno;
     char name[50];
     int p_marks, c_marks, m_marks, e_marks, cs_marks;
     double per;
     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()
{
     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 ";
     cin.ignore();
     cin.getline(name,50);
     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() const
{
     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() const
{
     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(8)<<per<<setw(6)<<grade<<endl;
}

int  student::retrollno() const
{
     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
     intro();
     do
     {
          system("cls");
          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;
}

//***************************************************************
//         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;
     system("cls");
     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;
     system("cls");
     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";
     cin.get();
}

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

void entry_menu()
{
     char ch;
     int num;
     system("cls");
     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;
     system("cls");
     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
//***************************************************************
Comments: