Machine Problem
Create a Student Grading System using a text file which allows the user to add student record, view student record, edit student record, find student record, remove or delete student record in the text file database.
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Program Listing
// student.cpp
// Written By Mr. Jake R. Pomperada, BSCS, MAED-IT
// July 26, 2018 Thursday
// Bacolod City, Negros Occidental Philippines
// Website : http://www.jakerpomperada.com
// Email Address : jakerpomperada@jakerpomperada.com and jakerpomperada@aol.com
#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");
system("COLOR F0");
setprecision(0);
cout <<"\n";
cout << "\n\t==========================================";
cout <<"\n";
cout <<"\n\tSTUDENT GRADING DATABASE SYSTEM IN C++";
cout <<"\n\n";
cout << "\tCreated By Mr. Jake R. Pomperada,MAED-IT";
cout <<"\n\t==========================================";
cout <<"\n\n";
cout << "\t[1] INSERT STUDENT RECORD";
cout <<"\n";
cout << "\t[2] BROWSE STUDENT RECORD";
cout <<"\n";
cout << "\t[3] EDIT STUDENT RECORDS" ;
cout <<"\n";
cout <<"\t[4] FIND STUDENT RECORDS";
cout <<"\n";
cout << "\t[5] REMOVE STUDENT RECORDS";
cout <<"\n";
cout << "\t[6] QUIT PROGRAM" ;
cout <<"\n\n";
cout <<"\tSELECT 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 << "\t=== INSERT NEW STUDENT GRADE RECORD ===";
cout <<"\n\n";
cout <<"\tEnter Student ID Number : ";
cin >> grade.stud_id_no;
cout << "\tEnter Student Name: ";
fflush (stdin) ;
gets(grade.name);
cout <<"\tEnter Course : ";
fflush (stdin) ;
gets(grade.course);
cout <<"\tEnter Subject : ";
fflush (stdin) ;
gets(grade.subject);
cout <<"\tEnter Prelim Grade: ";
cin >> grade.prelim;
cout << "\tEnter Midtem Grade: ";
cin >> grade.midterm;
cout << "\tEnter Endterm Grade: ";
cin >> grade.endterm;
grade.final_grade = (grade.prelim * 0.30) + (grade.midterm * 0.30) + (grade.endterm * 0.40);
cout << "\n";
cout << "\n\tStudent Final Grade : " << round(grade.final_grade);
fwrite (&grade, recsize, 1, fp ) ;
cout << "\n\n";
cout << "\n\tAdd New Student Record (Y/N) : " ;
fflush (stdin) ;
another = toupper(getche()) ;
}
break ;
case '2' :
system("cls");
rewind ( fp );
cout << "\n\n";
cout <<"\t=== VIEW STUDENT GRADE RECORD ===";
cout <<"\n\n";
while ( fread ( &grade, recsize, 1, fp ) == 1 )
{
cout <<"\n";
cout <<"\n\t ID Number : " <<grade.stud_id_no;
cout <<"\n\t Name : " <<grade.name;
cout <<"\n\t Course : " <<grade.course;
cout <<"\n\t Subject : " << grade.subject;
cout <<"\n\t Prelim Grade : " <<grade.prelim;
cout <<"\n\t Midterm Grade : " <<grade.midterm;
cout <<"\n\t Endterm Grade : " <<grade.endterm;
cout <<"\n";
grade.final_grade = (grade.prelim * 0.30) + (grade.midterm * 0.30) + (grade.endterm * 0.40);
cout <<"\n\t Student Final Grade : " <<round(grade.final_grade);
}
cout <<"\n\n";
system("pause");
break ;
case '3' :
another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
cout <<"\t=== EDIT STUDENT GRADE RECORD ===";
cout <<"\n\n";
cout <<"\tEnter 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 <<"\tEnter Student ID Number : ";
fflush (stdin) ;
gets(grade.stud_id_no);
cout <<"\tEnter Student Name : ";
fflush ( stdin ) ;
gets(grade.name);
cout <<"\tEnter Course: ";
fflush ( stdin ) ;
gets(grade.course);
cout <<"\tEnter Subject : ";
fflush ( stdin ) ;
gets(grade.subject);
cout <<"\tEnter Prelim Grade : ";
cin >> grade.prelim;
cout <<"\tEnter Midtem Grade : ";
cin >> grade.midterm;
cout <<"\tEnter Endterm Grade: ";
cin >> grade.endterm;
cout <<"\n";
grade.final_grade = (grade.prelim * 0.20) + (grade.midterm * 0.30) + (grade.endterm * 0.50);
cout <<"\n\tStudent 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 <<"\tNo Student Record in the Database.";
cout <<"\n";
system("pause");
break;
}
cout <<"\n\n";
cout <<"\n\tEdit Another Student Record (Y/N) : ";
fflush ( stdin ) ;
another = toupper(getche());
}
break ;
case '4' :
rewind ( fp ) ;
another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
cout <<"\t=== Find Student Records ===";
cout <<"\n\n";
cout <<"\tEnter 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\tID Number : " <<grade.stud_id_no;
cout <<"\n\tName : " << grade.name;
cout <<"\n\tCourse : " <<grade.course;
cout <<"\n\tSubject : " <<grade.subject;
cout <<"\n\tPrelim Grade : " <<grade.prelim;
cout <<"\n\tMidterm Grade : " <<grade.midterm;
cout <<"\n\tEndterm Grade : " << grade.endterm;
cout <<"\n";
grade.final_grade = (grade.prelim * 0.30) + (grade.midterm * 0.30) + (grade.endterm * 0.40);
cout <<"\n\tStudent 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 <<"\tNo Student Record found in the Database.";
cout <<"\n";
system("pause");
break;
}
cout <<"\n\n";
cout <<"\n\tFind Another Student Record (Y/N) : " ;
fflush ( stdin ) ;
another = toupper(getche());
}
break ;
case '5' :
another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
cout <<"\t=== REMOVE STUDENT GRADE RECORD ===";
cout <<"\n\n";
cout <<"\tEnter 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 <<"\tRecord Successfully Deleted From the Database.";
cout <<"\n";
system("pause");
}
else if (flag!=1) {
cout <<"\n\n";
cout <<"\tRecord Not Found in the Database.";
cout <<"\n";
system("pause");
}
cout <<"\n\n";
cout << "\tRemove Another Student Record (Y/N) : " ;
fflush (stdin) ;
another = toupper(getche());
}
break ;
case '6' :
fclose ( fp ) ;
cout <<"\n\n";
cout <<"\tEND OF PROGRAM";
cout <<"\n\n";
cout << "\tThank You Very Much For Using This Software.";
cout <<"\n\n";
system("PAUSE");
exit(0);
}
}
} // End of Code
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