A simple program that I wrote to show database development using Binary File in C programming language. I called this application Student Grading Database System in C which enables the user to add, edit, delete, view and quit student grade records it stores the record of the student in the binary file. I am using Dev C++ as my C compiler but the I code can also run in a typical Borland Turbo C or Turbo C++ compiler in DOS.
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Program Listing
/* grades.c
Author : Mr. Jake Rodriguez Pomperada,BSCS,MAED-IT
Tool : Dev C++ 5.11
Date : April 19, 2019 Friday 5:23 PM
Website : www.jakerpomperada.com
Email : jake_pomperada@tup.edu.ph and jakerpomperada@gmail.com
Location : Bacolod City, Negros Occidental
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <ctype.h>
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");
printf("\n");
printf("\n======================================");
printf("\n");
printf("\nSTUDENT GRADING DATABASE SYSTEM ");
printf("\n");
printf("\n======================================");
printf("\n\n");
printf ( "1. INSERT STUDENT RECORD" ) ;
printf("\n");
printf ( "2. BROWSE STUDENT RECORD" ) ;
printf("\n");
printf ( "3. EDIT STUDENT RECORDS" ) ;
printf("\n");
printf ( "4. FIND STUDENT RECORDS" ) ;
printf("\n");
printf ( "5. REMOVE STUDENT RECORDS" ) ;
printf("\n");
printf ( "6. QUIT PROGRAM" ) ;
printf("\n\n");
printf ("SELECT YOUR OPTION :=> " ) ;
fflush (stdin) ;
choice = getche() ;
switch ( choice )
{
case '1' :
fseek ( fp, 0 , SEEK_END ) ;
another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
printf("\n\n");
printf("=== INSERT NEW STUDENT GRADE RECORD ===");
printf("\n\n");
printf("Enter Student ID Number : ");
scanf("%s",&grade.stud_id_no);
printf("Enter Student Name: ");
fflush (stdin) ;
gets(grade.name);
printf("Enter Course : ");
fflush (stdin) ;
gets(grade.course);
printf("Enter Subject : ");
fflush (stdin) ;
gets(grade.subject);
printf("Enter Prelim Grade: ");
scanf("%f",&grade.prelim);
printf("Enter Midtem Grade: ");
scanf("%f",&grade.midterm);
printf("Enter Endterm Grade: ");
scanf("%f",&grade.endterm);
grade.final_grade = (grade.prelim * 0.30) + (grade.midterm * 0.30) + (grade.endterm * 0.40);
printf("\n");
printf("\n Student Final Grade : %2.0f",grade.final_grade);
fwrite (&grade, recsize, 1, fp ) ;
printf("\n\n");
printf ( "\nAdd New Student Record (Y/N) : " ) ;
fflush (stdin) ;
another = toupper(getche()) ;
}
break ;
case '2' :
system("cls");
rewind ( fp );
printf("\n\n");
printf("=== VIEW STUDENT GRADE RECORD ===");
printf("\n\n");
while ( fread ( &grade, recsize, 1, fp ) == 1 )
{
printf("\n");
printf("\n ID Number : %s",grade.stud_id_no);
printf("\n Name: %s",grade.name);
printf("\n Course : %s",grade.course);
printf("\n Subject : %s",grade.subject);
printf("\n Prelim Grade: %2.0f",grade.prelim);
printf("\n Midterm Grade: %2.0f",grade.midterm);
printf("\n Endterm Grade: %2.0f",grade.endterm);
printf("\n");
grade.final_grade = (grade.prelim * 0.30) + (grade.midterm * 0.30) + (grade.endterm * 0.40);
printf("\n Student Final Grade : %2.0f",grade.final_grade);
}
printf("\n\n");
system("pause");
break ;
case '3' :
another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
printf("=== EDIT STUDENT GRADE RECORD ===");
printf("\n\n");
printf("Enter Student ID Number : ");
scanf("%s",&student_id);
rewind ( fp ) ;
printf("\n");
while ( fread ( &grade, recsize, 1, fp ) == 1 )
{
if ( strcmp ( grade.stud_id_no, student_id) == 0 )
{
printf("Enter Student ID Number : ");
fflush (stdin) ;
gets(grade.stud_id_no);
printf("Enter Student Name : ");
fflush ( stdin ) ;
gets(grade.name);
printf("Enter Course: ");
fflush ( stdin ) ;
gets(grade.course);
printf("Enter Subject : ");
fflush ( stdin ) ;
gets(grade.subject);
printf("Enter Prelim Grade : ");
scanf("%f",&grade.prelim);
printf("Enter Midtem Grade : ");
scanf("%f",&grade.midterm);
printf("Enter Endterm Grade: ");
scanf("%f",&grade.endterm);
printf("\n");
grade.final_grade = (grade.prelim * 0.20) + (grade.midterm * 0.30) + (grade.endterm * 0.50);
printf("\n Student Final Grade : %2.0f",grade.final_grade);
fseek ( fp, - recsize, SEEK_CUR ) ;
fwrite ( &grade, recsize, 1, fp ) ;
break ;
}
}
if (strcmp(grade.stud_id_no,student_id) != 0 )
{
printf("\n\n");
printf("No Student Record in the Database.");
printf("\n");
system("pause");
break;
}
printf("\n\n");
printf ( "\nEdit Another Student Record (Y/N) : " ) ;
fflush ( stdin ) ;
another = toupper(getche());
}
break ;
case '4' :
rewind ( fp ) ;
another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
printf("=== Find Student Records ===");
printf("\n\n");
printf("Enter Student ID Number : ");
scanf("%s",&student_id);
printf("\n");
rewind ( fp ) ;
while ( fread ( &grade, recsize, 1, fp ) == 1 )
{
if ( strcmp (grade.stud_id_no,student_id) == 0 )
{
printf("\n");
printf("\n ID Number: %s",grade.stud_id_no);
printf("\n Name: %s",grade.name);
printf("\n Course : %s",grade.course);
printf("\n Subject : %s",grade.subject);
printf("\n Prelim Grade: %2.0f",grade.prelim);
printf("\n Midterm Grade: %2.0f",grade.midterm);
printf("\n Endterm Grade: %2.0f",grade.endterm);
printf("\n");
grade.final_grade = (grade.prelim * 0.30) + (grade.midterm * 0.30) + (grade.endterm * 0.40);
printf("\n Student Final Grade : %2.0f",grade.final_grade);
printf("\n\n");
system("pause");
break;
}
}
if (strcmp(grade.stud_id_no,student_id) != 0 )
{
printf("\n\n");
printf("No Student Record found in the Database.");
printf("\n");
system("pause");
break;
}
printf("\n\n");
printf ( "\n Find Another Student Record (Y/N) : " ) ;
fflush ( stdin ) ;
another = toupper(getche());
}
break ;
case '5' :
another = 'Y' ;
while ( another == 'Y' )
{
system("cls");
printf("=== REMOVE STUDENT GRADE RECORD ===");
printf("\n\n");
printf("Enter Student ID Number : ");
scanf("%s",&student_id);
printf("\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) {
printf("\n\n");
printf("Record Successfully Deleted From the Database.");
printf("\n");
system("pause");
}
else if (flag!=1) {
printf("\n\n");
printf("Record Not Found in the Database.");
printf("\n");
system("pause");
}
printf("\n\n");
printf( "Remove Another Student Record (Y/N) : " ) ;
fflush (stdin) ;
another = toupper(getche());
}
break ;
case '6' :
fclose ( fp ) ;
printf("\n\n");
printf("END OF PROGRAM");
printf("\n\n");
system("PAUSE");
exit(0);
}
}
}