Hi guys! I'm new in c++ so I really need your help. I have this code but I have to use classes, how can i modify the struct to class? Please help me.

#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 INFORMATION 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;
}

Edited 10 Months Ago by pritaeas: Moved to software dev.

Structures are similar to classes , except class members are private by default, whereas structure members are public by default. That means, if you want to access class member , you have to declare them as public.

class student {
        int student_id;// student_id not accessible outside class
    public: char first_name[50], last_name[50];
        char course[100];
        int section;

        };

For more info see classes

Thank you so much for your help and thank you for making me understand the difference between classes and structures

There is much more difference between classes and structures, like class member functions, friend functions ect. For more information on classes take a look at the previous link.

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