Student Database Grading System in C++

In this article I would like to share with you a database system that I wrote in C++ and my back end is binary file in C++ that has a function to add,edit, view and delete the record of the student. It has also a function to compute the student grades. 

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My email address are the following jakerpomperada@gmail.com and jakerpomperada@yahoo.com.

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Sample Program Output

Program Listing

student.cpp

// student.cpp
// Written By Mr. Jake R. Pomperada, BSCS, MAED-IT
// July 26, 2018  Thursday
// Bacolod City, Negros Occidental Philippines

#include <iostream>
#include <iomanip>
#include <cmath>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <ctype.h>

 using namespace std;


int main( )
{
FILE *fp, *ft ;
char another, choice ;
struct student
{
char stud_id_no[300];
char name[300];
char course[300];
char subject[300];
float prelim,midterm,endterm,final_grade;
} ;
struct student grade;
char student_id[300];
long int recsize;
    int flag=0;
fp = fopen ("GRADE_DB.DAT", "rb+" ) ;
if ( fp == NULL )
{
fp = fopen ( "GRADE_DB.DAT", "wb+" ) ;
if ( fp == NULL )
{
puts ( "Cannot open file" ) ;
exit(0) ;
}
}
recsize = sizeof ( grade ) ;
while ( 1 )
{
       system("CLS");
         setprecision(0);
        cout <<"\n";
cout << "\n============================================";
cout <<"\n";
cout <<"\n STUDENT GRADING DATABASE SYSTEM IN C++";
cout <<"\n";
cout << " Created By Mr. Jake R. Pomperada, MAED-IT";
cout <<"\n=============================================";
cout <<"\n\n";
cout << "1. INSERT STUDENT RECORD";
cout <<"\n";
cout << "2. BROWSE STUDENT RECORD";
cout <<"\n";
cout << "3. EDIT STUDENT RECORDS" ;
cout <<"\n";
cout  << "4. FIND STUDENT RECORDS";
cout <<"\n";
cout << "5. REMOVE STUDENT RECORDS";
cout <<"\n";
cout  << "6. QUIT PROGRAM" ;
cout <<"\n\n";
cout  <<"SELECT YOUR OPTION :=> ";
fflush (stdin) ;
choice = getche() ;
switch ( choice )
{
case '1' :
fseek ( fp, 0 , SEEK_END ) ;
another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
cout <<"\n\n";
cout << "=== INSERT NEW STUDENT GRADE RECORD ===";
cout <<"\n\n";
cout <<"Enter Student ID Number : ";
                    cin >> grade.stud_id_no;
cout << "Enter Student Name: ";
fflush (stdin) ;
gets(grade.name);
cout <<"Enter Course : ";
fflush (stdin) ;
gets(grade.course);
                    cout <<"Enter Subject : ";
fflush (stdin) ;
gets(grade.subject);
cout <<"Enter Prelim Grade: ";
cin >> grade.prelim;
cout << "Enter Midtem Grade: ";
cin >> grade.midterm;
cout << "Enter Endterm Grade: ";
cin >> grade.endterm;
grade.final_grade = (grade.prelim * 0.30) + (grade.midterm * 0.30) + (grade.endterm * 0.40);
cout << "\n";
                    cout << "\n Student Final Grade : "  << round(grade.final_grade);
fwrite (&grade, recsize, 1, fp ) ;
cout << "\n\n";
cout  << "\nAdd New Student Record (Y/N) : " ;
fflush (stdin) ;
another = toupper(getche()) ;
}
break ;
case '2' :
        system("cls");
rewind ( fp );
cout << "\n\n";
                cout <<"=== VIEW STUDENT GRADE RECORD ===";
                cout <<"\n\n";
while ( fread ( &grade, recsize, 1, fp ) == 1 )
        {
       cout <<"\n";
       cout <<"\n  ID Number        : " <<grade.stud_id_no;
       cout <<"\n  Name             : " <<grade.name;
       cout <<"\n  Course           : " <<grade.course;
       cout <<"\n  Subject          : " << grade.subject;
       cout <<"\n  Prelim Grade     : " <<grade.prelim;
       cout <<"\n  Midterm Grade    : " <<grade.midterm;
       cout <<"\n  Endterm Grade    : " <<grade.endterm;
       cout <<"\n";
       grade.final_grade = (grade.prelim * 0.30) + (grade.midterm * 0.30) + (grade.endterm * 0.40);
       cout <<"\n Student Final Grade : " <<round(grade.final_grade);
  }
          cout <<"\n\n";
         system("pause");
break ;
case '3' :
another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
          cout <<"=== EDIT STUDENT GRADE RECORD ===";
        cout <<"\n\n";
          cout <<"Enter Student ID Number : ";
                cin >> student_id;
    rewind ( fp ) ;
cout <<"\n";
while ( fread ( &grade, recsize, 1, fp ) == 1 )
{
if ( strcmp ( grade.stud_id_no, student_id) == 0 )
{
cout <<"Enter Student ID Number : ";
                            fflush (stdin) ;
                            gets(grade.stud_id_no);
cout <<"Enter Student Name : ";
fflush ( stdin ) ;
gets(grade.name);
        cout <<"Enter Course: ";
fflush ( stdin ) ;
gets(grade.course);
cout <<"Enter Subject : ";
fflush ( stdin ) ;
gets(grade.subject);
cout <<"Enter Prelim Grade : ";
cin >> grade.prelim;
cout <<"Enter Midtem Grade : ";
cin >> grade.midterm;
cout <<"Enter Endterm Grade: ";
cin >> grade.endterm;
cout <<"\n";
grade.final_grade = (grade.prelim * 0.20) + (grade.midterm * 0.30) + (grade.endterm * 0.50);
cout <<"\n Student Final Grade : " << round(grade.final_grade);
fseek ( fp, - recsize, SEEK_CUR ) ;
fwrite ( &grade, recsize, 1, fp ) ;
break ;
}
}
if (strcmp(grade.stud_id_no,student_id) != 0 )
                 {  
                   cout <<"\n\n";
                   cout <<"No Student Record in the Database.";
                   cout <<"\n";
                   system("pause");
                   break;
                   }
                 cout <<"\n\n";
     cout  <<"\nEdit Another Student Record (Y/N) : ";
fflush ( stdin ) ;
another = toupper(getche());
}
break ;
      case '4' :
   rewind ( fp ) ;
    another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
        cout <<"=== Find Student Records ===";
        cout <<"\n\n";
     cout <<"Enter Student ID Number : ";
                 cin >>student_id;
cout <<"\n";
rewind ( fp ) ;
while ( fread ( &grade, recsize, 1, fp ) == 1 )
{
if ( strcmp (grade.stud_id_no,student_id) == 0 )
{
                    cout <<"\n";
cout <<"\n ID Number      : " <<grade.stud_id_no;
cout <<"\n Name           : " << grade.name;
cout <<"\n Course         :  " <<grade.course;
            cout <<"\n Subject        : " <<grade.subject;
                    cout <<"\n Prelim Grade   :  " <<grade.prelim;
                   cout <<"\n  Midterm Grade  :  " <<grade.midterm;
                   cout <<"\n  Endterm Grade  : " << grade.endterm;
                   cout <<"\n";
       grade.final_grade = (grade.prelim * 0.30) + (grade.midterm * 0.30) + (grade.endterm * 0.40);
       cout <<"\n Student Final Grade : " << round(grade.final_grade);
       cout <<"\n\n";
       system("pause");
       break;
}
}
      if (strcmp(grade.stud_id_no,student_id) != 0 )
          {
            cout <<"\n\n";
            cout <<"No Student Record found in the Database.";
            cout <<"\n";
            system("pause");
            break;
           }
                    cout  <<"\n\n";
cout  <<"\n Find Another Student Record (Y/N) : " ;
fflush ( stdin ) ;
another = toupper(getche());
}
break ;
case '5' :
another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
                    cout <<"=== REMOVE STUDENT GRADE RECORD ===";
                    cout <<"\n\n";
cout <<"Enter Student ID Number : ";
                    cin >> student_id;
cout <<"\n";
ft = fopen ( "TEMP.DAT", "wb" ) ;
rewind ( fp ) ;
while ( fread ( &grade, recsize, 1, fp ) == 1 )
{
if ( strcmp (grade.stud_id_no, student_id) != 0 )
fwrite ( &grade, recsize, 1, ft ) ;
                 else
                flag=1;
                  }
fclose ( fp ) ;
fclose ( ft ) ;
remove ( "GRADE_DB.DAT" ) ;
rename ( "TEMP.DAT", "GRADE_DB.DAT" ) ;
    fp = fopen ( "GRADE_DB.DAT", "rb+" ) ;
       if(flag==1) {
         cout <<"\n\n";
         cout <<"Record Successfully Deleted From the Database.";
         cout <<"\n";
         system("pause");
         }
else if (flag!=1) {
             cout <<"\n\n";
             cout <<"Record Not Found in the Database.";
             cout <<"\n";
            system("pause");
             }
                    cout <<"\n\n";
cout << "Remove Another Student Record (Y/N) : " ;
fflush (stdin) ;
another = toupper(getche());
}
break ;
case '6' :
fclose ( fp ) ;
cout <<"\n\n";
cout <<"END OF PROGRAM";
cout <<"\n\n";
cout << "Thank You Very Much For Using This Software.";
cout <<"\n\n";
system("PAUSE");
exit(0);
}
}

}