Student Database System.cpp

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <conio.h>
#include <iomanip>

using namespace std;
int main()
{
    FILE* fp, * ft;
    char another, choice;

    struct student
    {
        char first_name[50], last_name[50];
        char course[100];
        int section;
    };

    struct student e;
    char xfirst_name[50], xlast_name[50];
    long int recsize;

    fp = fopen("users.txt", "rb+");

    if (fp == NULL)
    {
        fp = fopen("users.txt", "wb+");

        if (fp == NULL)
        {
            puts("Cannot open file");
            return 0;
        }
    }


    recsize = sizeof(e);

    while (1)
    {
        system("cls");

        cout << "\t\t====== STUDENT DATABASE MANAGEMENT SYSTEM ======";
        cout << "\n\n                                          ";
        cout << "\n\n";
        cout << "\n \t\t\t 1. Add    Records";
        cout << "\n \t\t\t 2. List   Records";
        cout << "\n \t\t\t 3. Modify Records";
        cout << "\n \t\t\t 4. Delete Records";
        cout << "\n \t\t\t 5. Exit   Program";
        cout << "\n\n";
        cout << "\t\t\t Select Your Choice :=> ";
        fflush(stdin);
        choice = getche();
        switch (choice)
        {
        case '1':
            fseek(fp, 0, SEEK_END);
            another = 'Y';
            while (another == 'Y' || another == 'y')
            {
                system("cls");
                cout << "Enter the Firt Name : ";
                cin >> e.first_name;
                cout << "Enter the Last Name : ";
                cin >> e.last_name;
                cout << "Enter the Course    : ";
                cin >> e.course;
                cout << "Enter the Section   : ";
                cin >> e.section;
                fwrite(&e, recsize, 1, fp);
                cout << "\n Add Another Record (Y/N) ";
                fflush(stdin);
                another = getchar();
            }
            break;
        case '2':
            system("cls");
            rewind(fp);
            cout << "=== View the Records in the Database ===";
            cout << "\n";
            while (fread(&e, recsize, 1, fp) == 1)
            {
                cout << "\n";
                cout << "\n" << e.first_name << setw(10) << e.last_name;
                cout << "\n";
                cout << "\n" << e.course << setw(8) << e.section;
            }
            cout << "\n\n";
            system("pause");
            break;

        case '3':
            system("cls");
            another = 'Y';
            while (another == 'Y' || another == 'y')
            {
                cout << "\n Enter the last name of the student : ";
                cin >> xlast_name;

                rewind(fp);
                while (fread(&e, recsize, 1, fp) == 1)
                {
                    if (strcmp(e.last_name, xlast_name) == 0)
                    {
                        cout << "Enter new the Firt Name : ";
                        cin >> e.first_name;
                        cout << "Enter new the Last Name : ";
                        cin >> e.last_name;
                        cout << "Enter new the Course    : ";
                        cin >> e.course;
                        cout << "Enter new the Section   : ";
                        cin >> e.section;
                        fseek(fp, -recsize, SEEK_CUR);
                        fwrite(&e, recsize, 1, fp);
                        break;
                    }
                    else
                        cout << "record not found";
                }
                cout << "\n Modify Another Record (Y/N) ";
                fflush(stdin);
                another = getchar();
            }
            break;


        case '4':
            system("cls");
            another = 'Y';
            while (another == 'Y' || another == 'y')
            {
                cout << "\n Enter the last name of the student to delete : ";
                cin >> xlast_name;

                ft = fopen("temp.dat", "wb");

                rewind(fp);
                while (fread(&e, recsize, 1, fp) == 1)

                    if (strcmp(e.last_name, xlast_name) != 0)
                    {
                        fwrite(&e, recsize, 1, ft);
                    }
                fclose(fp);
                fclose(ft);
                remove("users.txt");
                rename("temp.dat", "users.txt");

                fp = fopen("users.txt", "rb+");

                cout << "\n Delete Another Record (Y/N) ";
                fflush(stdin);
                another = getchar();
            }

            break;

        case '5':
            fclose(fp);
            cout << "\n\n";
            cout << "\t\t     THANK YOU FOR USING THIS SOFTWARE";
            cout << "\n\n";
            exit(0);
        }
    }


    system("pause");
    return 0;
}